LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. From 1.0.9 to before 1.6.57, passing a pointer obtained from png_get_PLTE, png_get_tRNS, or png_get_hIST back into the corresponding setter on the same png_struct/png_info pair causes the setter to read from freed memory and copy its contents into the replacement buffer. The setter frees the internal buffer before copying from the caller-supplied pointer, which now dangles. The freed region may contain stale data (producing silently corrupted chunk metadata) or data from subsequent heap allocations (leaking unrelated heap contents into the chunk struct). This vulnerability is fixed in 1.6.57.

An update of the libpng package has been released.

According to the versions of the libpng packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

    LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable     Network Graphics) raster image files. In versions 1.2.1 through 1.6.55, `png_set_tRNS` and `png_set_PLTE`     each alias a heap-allocated buffer between `png_struct` and `png_info`, sharing a single allocation across     two structs with independent lifetimes. The `trans_alpha` aliasing has been present since at least libpng     1.0, and the `palette` aliasing since at least 1.2.1. Both affect all prior release lines `png_set_tRNS`     sets `png_ptr-trans_alpha = info_ptr-trans_alpha` (256-byte buffer) and `png_set_PLTE` sets     `info_ptr-palette = png_ptr-palette` (768-byte buffer). In both cases, calling `png_free_data` (with     `PNG_FREE_TRNS` or `PNG_FREE_PLTE`) frees the buffer through `info_ptr` while the corresponding `png_ptr`     pointer remains dangling. Subsequent row-transform functions dereference and, in some code paths, write to     the freed memory. A second call to `png_set_tRNS` or `png_set_PLTE` has the same effect, because both     functions call `png_free_data` internally before reallocating the `info_ptr` buffer. Version 1.6.56 fixes     the issue.(CVE-2026-33416)

    LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable     Network Graphics) raster image files. From 1.0.9 to before 1.6.57, passing a pointer obtained from     png_get_PLTE, png_get_tRNS, or png_get_hIST back into the corresponding setter on the same     png_struct/png_info pair causes the setter to read from freed memory and copy its contents into the     replacement buffer. The setter frees the internal buffer before copying from the caller-supplied pointer,     which now dangles. The freed region may contain stale data (producing silently corrupted chunk metadata)     or data from subsequent heap allocations (leaking unrelated heap contents into the chunk struct). This     vulnerability is fixed in 1.6.57.(CVE-2026-34757)

    LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable     Network Graphics) raster image files. In versions 1.6.36 through 1.6.55, an out-of-bounds read and write     exists in libpng's ARM/AArch64 Neon-optimized palette expansion path. When expanding 8-bit paletted rows     to RGB or RGBA, the Neon loop processes a final partial chunk without verifying that enough input pixels     remain. Because the implementation works backward from the end of the row, the final iteration     dereferences pointers before the start of the row buffer (OOB read) and writes expanded pixel data to the     same underflowed positions (OOB write). This is reachable via normal decoding of attacker-controlled PNG     input if Neon is enabled. Version 1.6.56 fixes the issue.(CVE-2026-33636)

Tenable has extracted the preceding description block directly from the EulerOS Virtualization libpng security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

According to the versions of the libpng packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

    LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable     Network Graphics) raster image files. In versions 1.2.1 through 1.6.55, `png_set_tRNS` and `png_set_PLTE`     each alias a heap-allocated buffer between `png_struct` and `png_info`, sharing a single allocation across     two structs with independent lifetimes. The `trans_alpha` aliasing has been present since at least libpng     1.0, and the `palette` aliasing since at least 1.2.1. Both affect all prior release lines `png_set_tRNS`     sets `png_ptr-trans_alpha = info_ptr-trans_alpha` (256-byte buffer) and `png_set_PLTE` sets     `info_ptr-palette = png_ptr-palette` (768-byte buffer). In both cases, calling `png_free_data` (with     `PNG_FREE_TRNS` or `PNG_FREE_PLTE`) frees the buffer through `info_ptr` while the corresponding `png_ptr`     pointer remains dangling. Subsequent row-transform functions dereference and, in some code paths, write to     the freed memory. A second call to `png_set_tRNS` or `png_set_PLTE` has the same effect, because both     functions call `png_free_data` internally before reallocating the `info_ptr` buffer. Version 1.6.56 fixes     the issue.(CVE-2026-33416)

    LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable     Network Graphics) raster image files. From 1.0.9 to before 1.6.57, passing a pointer obtained from     png_get_PLTE, png_get_tRNS, or png_get_hIST back into the corresponding setter on the same     png_struct/png_info pair causes the setter to read from freed memory and copy its contents into the     replacement buffer. The setter frees the internal buffer before copying from the caller-supplied pointer,     which now dangles. The freed region may contain stale data (producing silently corrupted chunk metadata)     or data from subsequent heap allocations (leaking unrelated heap contents into the chunk struct). This     vulnerability is fixed in 1.6.57.(CVE-2026-34757)

    LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable     Network Graphics) raster image files. In versions 1.6.36 through 1.6.55, an out-of-bounds read and write     exists in libpng's ARM/AArch64 Neon-optimized palette expansion path. When expanding 8-bit paletted rows     to RGB or RGBA, the Neon loop processes a final partial chunk without verifying that enough input pixels     remain. Because the implementation works backward from the end of the row, the final iteration     dereferences pointers before the start of the row buffer (OOB read) and writes expanded pixel data to the     same underflowed positions (OOB write). This is reachable via normal decoding of attacker-controlled PNG     input if Neon is enabled. Version 1.6.56 fixes the issue.(CVE-2026-33636)

Tenable has extracted the preceding description block directly from the EulerOS libpng security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-a109a9ac2c advisory.

    * updated to 1.6.58
    * 1.6.58 is released with a fix for a simple correctness bug (not a security issue) this time:
    png_get_PLTE() returns stale palette data when either gamma correction or alpha-compositing is the only     transform applied. Like the issues addressed in the previous release, this bug was a regression introduced     in the fix for CVE-2026-33416 in 1.6.56.
    * 1.6.57 is released with fixes for the following security vulnerability:
    - CVE-2026-34757 (medium severity): Use-after-free memory bug in the chunk setter API. The hIST variant     has existed since version 1.0.9, but the PLTE and tRNS ones are regressions introduced in the fix for     CVE-2026-33416 in 1.6.56 (oops).

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-67c1138ed2 advisory.

    * updated to 1.6.58
    * 1.6.58 is released with a fix for a simple correctness bug (not a security issue) this time:
    png_get_PLTE() returns stale palette data when either gamma correction or alpha-compositing is the only     transform applied. Like the issues addressed in the previous release, this bug was a regression introduced     in the fix for CVE-2026-33416 in 1.6.56.
    * 1.6.57 is released with fixes for the following security vulnerability:
    - CVE-2026-34757 (medium severity): Use-after-free memory bug in the chunk setter API. The hIST variant     has existed since version 1.0.9, but the PLTE and tRNS ones are regressions introduced in the fix for     CVE-2026-33416 in 1.6.56 (oops).

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

It is, therefore, affected by a vulnerability as referenced in the ALAS2023-2026-1670 advisory.

    Use-after-free in png_set_PLTE, png_set_tRNS and png_set_hIST in libpng before 1.6.57. Passing a pointer     returned by the corresponding getter back into the setter causes the setter to read from a stale pointer     after freeing the internal buffer, leading to corrupted chunk data and potential heap information     disclosure. (CVE-2026-34757)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Ubuntu 22.04 LTS / 24.04 LTS / 25.10 host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8251-1 advisory.

    It was discovered that libpng incorrectly handled memory when processing certain PNG files. If a user or     automated system were tricked into opening a specially crafted PNG file, an attacker could use this issue     to cause libpng to crash, resulting in a denial of service, or possibly execute arbitrary code.
    (CVE-2026-33416)

    It was discovered that libpng incorrectly handled expanding 8-bit paletted rows to RGB or RGBA on ARM     processors. If a user or automated system were tricked into opening a specially crafted PNG file, an     attacker could use this issue to cause libpng to crash, resulting in a denial of service, or possibly     execute arbitrary code. (CVE-2026-33636)

    It was discovered that libpng incorrectly handled certain setter APIs. An attacker could possibly use this     issue to obtain sensitive information. (CVE-2026-34757)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Debian 12 / 13 host has packages installed that are affected by a vulnerability as referenced in the dsa-6263 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6263-1                   security@debian.org     https://www.debian.org/security/                       Moritz Muehlenhoff     May 10, 2026                          https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : libpng1.6     CVE ID         : CVE-2026-34757

    A use-after-free was discovered in libpng, a library implementing an     interface for reading and writing PNG (Portable Network Graphics) files.

    For the oldstable distribution (bookworm), this problem has been fixed     in version 1.6.39-2+deb12u5.

    For the stable distribution (trixie), this problem has been fixed in     version 1.6.48-1+deb13u5.

    We recommend that you upgrade your libpng1.6 packages.

    For the detailed security status of libpng1.6 please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/libpng1.6

    Further information about Debian Security Advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://www.debian.org/security/

    Mailing list: debian-security-announce@lists.debian.org

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:1716-1 advisory.

    Update to version 1.2.59 (jsc#PED-16191).

    Security issues :

    - CVE-2017-12652: missing chunk length check can lead to sensitive information disclosure, data corruption     or crash       (bsc#1141493).
    - CVE-2026-33416: use-after-free via pointer aliasing in `png_set_tRNS` and `png_set_PLTE` can lead to     arbitrary code       execution (bsc#1260754).
    - CVE-2026-34757: use-after-free in `png_set_PLTE`, `png_set_tRNS` and `png_set_hIST` can lead to     corrupted chunk data       and potential heap information disclosure (bsc#1261957).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES12 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:1702-1 advisory.

    Update to version 1.2.59 (jsc#PED-16191).

    - CVE-2026-33416: use-after-free via pointer aliasing in `png_set_tRNS` and `png_set_PLTE` can lead to     arbitrary code       execution (bsc#1260754).
    - CVE-2026-34757: use-after-free in `png_set_PLTE`, `png_set_tRNS` and `png_set_hIST` can lead to     corrupted chunk data       and potential heap information disclosure (bsc#1261957).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Debian 11 host has packages installed that are affected by a vulnerability as referenced in the dla-4573 advisory.

    -------------------------------------------------------------------------     Debian LTS Advisory DLA-4573-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                         Tobias Frost     May 09, 2026                                  https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

    Package        : libpng1.6     Version        : 1.6.37-3+deb11u4     CVE ID         : CVE-2026-34757     Debian Bug     : 1133051

    A security vulnerability has been discovered in libpng, a library     implementing an interface for reading and writing PNG (Portable Network     Graphics) files, which could leading to corrupted chunk data and potential     heap information disclosure.

    For Debian 11 bullseye, this problem has been fixed in version     1.6.37-3+deb11u4.

    We recommend that you upgrade your libpng1.6 packages.

    For the detailed security status of libpng1.6 please refer to its security     tracker page at:
    https://security-tracker.debian.org/tracker/libpng1.6

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS     Attachment:
    signature.asc     Description: PGP signature

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The version of libpng installed on the remote host is prior to 1.5.13-8. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2026-3266 advisory.

    Use-after-free in png_set_PLTE, png_set_tRNS and png_set_hIST in libpng before 1.6.57. Passing a pointer     returned by the corresponding getter back into the setter causes the setter to read from a stale pointer     after freeing the internal buffer, leading to corrupted chunk data and potential heap information     disclosure. (CVE-2026-34757)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES12 host has packages installed that are affected by a vulnerability as referenced in the SUSE- SU-2026:1601-1 advisory.

    This update for libpng16 fixes the following issue:

    - CVE-2026-34757: information disclosure and data corruption due to use-after-free in `png_set_PLTE`,     `png_set_tRNS`       and `png_set_hIST` (bsc#1261957).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2026:1602-1 advisory.

    This update for libpng16 fixes the following issue:

    - CVE-2026-34757: information disclosure and data corruption due to use-after-free in `png_set_PLTE`,     `png_set_tRNS`       and `png_set_hIST` (bsc#1261957).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote openSUSE 16 host has packages installed that are affected by a vulnerability as referenced in the openSUSE- SU-2026:20593-1 advisory.

    This update for libpng16 fixes the following issue:

    - CVE-2026-34757: libpng: Information disclosure and data corruption via use-after-free vulnerability     (bsc#1261957).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES12 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:1500-1 advisory.

    - CVE-2026-34757: use-after-free in `png_set_PLTE`, `png_set_tRNS` and `png_set_hIST` can lead to     information       disclosure and data corruption (bsc#1261957).
    - CVE-2026-33416: use-after-free via pointer aliasing in `png_set_tRNS` and `png_set_PLTE` can lead to     arbitrary code       execution (bsc#1260754).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of libpng installed on the remote host is prior to 1.6.57. It is, therefore, affected by a vulnerability as referenced in the SSA:2026-099-01 advisory.

    New libpng packages are available for Slackware 15.0 and -current to fix a security issue.

Tenable has extracted the preceding description block directly from the libpng security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable     Network Graphics) raster image files. From 1.0.9 to before 1.6.57, passing a pointer obtained from     png_get_PLTE, png_get_tRNS, or png_get_hIST back into the corresponding setter on the same     png_struct/png_info pair causes the setter to read from freed memory and copy its contents into the     replacement buffer. The setter frees the internal buffer before copying from the caller-supplied pointer,     which now dangles. The freed region may contain stale data (producing silently corrupted chunk metadata)     or data from subsequent heap allocations (leaking unrelated heap contents into the chunk struct). This     vulnerability is fixed in 1.6.57. (CVE-2026-34757)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
321787	Photon OS 5.0: Libpng PHSA-2026-5.0-0883	Nessus	PhotonOS Local Security Checks	medium
320744	EulerOS Virtualization 2.13.0 : libpng (EulerOS-SA-2026-2404)	Nessus	Huawei Local Security Checks	medium
320724	EulerOS Virtualization 2.13.1 : libpng (EulerOS-SA-2026-2375)	Nessus	Huawei Local Security Checks	medium
320276	EulerOS 2.0 SP13 : libpng (EulerOS-SA-2026-2297)	Nessus	Huawei Local Security Checks	medium
320243	EulerOS 2.0 SP13 : libpng (EulerOS-SA-2026-2340)	Nessus	Huawei Local Security Checks	medium
318196	Fedora 43 : libpng (2026-a109a9ac2c)	Nessus	Fedora Local Security Checks	medium
317514	Fedora 44 : libpng (2026-67c1138ed2)	Nessus	Fedora Local Security Checks	medium
315646	Amazon Linux 2023 : libpng, libpng-devel, libpng-static (ALAS2023-2026-1670)	Nessus	Amazon Linux Local Security Checks	medium
314216	Ubuntu 22.04 LTS / 24.04 LTS / 25.10 : libpng vulnerabilities (USN-8251-1)	Nessus	Ubuntu Local Security Checks	medium
313712	Debian dsa-6263 : libpng-dev - security update	Nessus	Debian Local Security Checks	medium
313675	SUSE SLED15 / SLES15 Security Update : libpng12 (SUSE-SU-2026:1716-1)	Nessus	SuSE Local Security Checks	critical
313652	SUSE SLES12 Security Update : libpng12 (SUSE-SU-2026:1702-1)	Nessus	SuSE Local Security Checks	medium
313514	Debian dla-4573 : libpng-dev - security update	Nessus	Debian Local Security Checks	medium
311222	Amazon Linux 2 : libpng, --advisory ALAS2-2026-3266 (ALAS-2026-3266)	Nessus	Amazon Linux Local Security Checks	medium
310243	SUSE SLES12 Security Update : libpng16 (SUSE-SU-2026:1601-1)	Nessus	SuSE Local Security Checks	medium
310229	SUSE SLED15 / SLES15 Security Update : libpng16 (SUSE-SU-2026:1602-1)	Nessus	SuSE Local Security Checks	medium
309889	openSUSE 16 Security Update : libpng16 (openSUSE-SU-2026:20593-1)	Nessus	SuSE Local Security Checks	medium
309168	SUSE SLES12 Security Update : libpng15 (SUSE-SU-2026:1500-1)	Nessus	SuSE Local Security Checks	medium
305805	Slackware Linux 15.0 / current libpng Vulnerability (SSA:2026-099-01)	Nessus	Slackware Local Security Checks	medium
305709	Linux Distros Unpatched Vulnerability : CVE-2026-34757	Nessus	Misc.	medium

Detections

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CVE-2026-34757

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