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.

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
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	high
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

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