libde265 is an open source implementation of the h.265 video codec. Prior to version 1.0.20, a crafted sequence of H.265 NAL units causes `decoder_context::read_slice_NAL()` (`libde265/decctx.cc:481`) to attach slice headers to a finished picture object that has no active image unit, resulting in attacker-controlled unbounded heap growth. The retained headers are never freed until the picture is released, which may not happen during continuous streaming. Version 1.0.20 patches the issue.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - libde265 is an open source implementation of the h.265 video codec. Prior to version 1.0.20, a crafted
    sequence of H.265 NAL units causes `decoder_context::read_slice_NAL()` (`libde265/decctx.cc:481`) to
    attach slice headers to a finished picture object that has no active image unit, resulting in attacker-
    controlled unbounded heap growth. The retained headers are never freed until the picture is released,
    which may not happen during continuous streaming. Version 1.0.20 patches the issue. (CVE-2026-49337)

The remote Debian 12 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-4789 advisory.

    -------------------------------------------------------------------------     Debian LTS Advisory DLA-4789-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                         Tobias Frost     September 20, 2026                            https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

    Package        : libde265     Version        : 1.0.11-1+deb12u3     CVE ID         : CVE-2023-51792 CVE-2024-38949 CVE-2024-38950 CVE-2026-33164                      CVE-2026-33165 CVE-2026-45382 CVE-2026-45383 CVE-2026-49295                      CVE-2026-49337 CVE-2026-49346 CVE-2026-54240 CVE-2026-54241     Debian Bug     : 1074416 1131468 1131469 1140431

    Multiple issues were found in libde265, an open source implementation of     the H.265 video codec, which potentially may result in denial of     service, heap/buffer overflows, information disclosure or code     execution or have unspecified other impact.

    CVE-2023-51792

        Buffer Overflow vulnerability allows a local attacker to cause a         denial of service via the allocation size exceeding the maximum         supported size of 0x10000000000.

    CVE-2024-38949

        Heap Buffer Overflow vulnerability allows attackers to crash the         application via crafted payload.

    CVE-2024-38950

        Heap Buffer Overflow vulnerability allows attackers to crash the         application via crafted payload.

    CVE-2026-33164

        A malformed H.265 PPS NAL unit causes a segmentation fault.

    CVE-2026-33165

        A crafted HEVC bitstream causes an out-of-bounds heap write.

    CVE-2026-45382

        Heap-buffer-overflow READ in decode_slice_unit_tiles via unvalidated         PPS tile geometry.

    CVE-2026-45383

        Heap buffer overflow (OOB read) in decode_slice_unit_WPP() via         out-of-bounds CtbAddrRStoTS access.

    CVE-2026-49295

        Out-of-bounds write in process_reference_picture_set via predicted         short-term RPS.

    CVE-2026-49337

        Unbounded memory accumulation via orphaned slice headers in         `read_slice_NAL`

    CVE-2026-49346

        Heap buffer overflow in de265_image_get_buffer via SPS dimension         integer overflow

    CVE-2026-54240

        Pixel accessor signed integer overflow causes heap OOB read/write

    CVE-2026-54241

        SAO sequential filter heap buffer overflow via signed integer         overflow


    Two additional vulnerabilities for which CVE IDs are not yet available     have been fixed. (The identifier in brackets is the GitHub identifier):

    CVE-2026-XXXX (GHSA-xp3h-6f5r-8cxp)

        Concurrent Execution using Shared Resource with Improper         Synchronization ('Race Condition') and Use After Free and Double Free

    CVE-2026-XXXX (GHSA-mm7m-v26f-wf8x)

        heap-use-after-free in decoder_context::reset() via dangling         previous_slice_header


    For Debian 12 bookworm, these problems have been fixed in version     1.0.11-1+deb12u3.

    We recommend that you upgrade your libde265 packages.

    For the detailed security status of libde265 please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/libde265

    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 these issues but has instead relied only on the application's self-reported version number.

The remote Debian 13 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-6413 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6413-1                   security@debian.org     https://www.debian.org/security/                                  Aron Xu     August 06, 2026                       https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : libde265     CVE ID         : CVE-2024-38949 CVE-2024-38950 CVE-2025-61147 CVE-2026-45382                      CVE-2026-45383 CVE-2026-49295 CVE-2026-49337 CVE-2026-49346                      CVE-2026-54240 CVE-2026-54241     Debian Bug     : 1074416 1129257 1140431

    Multiple security issues were discovered in libde265, an open source     implementation of the H.265/HEVC video codec, which may result in denial     of service, memory exhaustion or potentially the execution of arbitrary     code if a malformed media file is processed.

    For the stable distribution (trixie), these problems have been fixed in     version 1.0.15-1+deb13u1.

    We recommend that you upgrade your libde265 packages.

    For the detailed security status of libde265 please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/libde265

    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 these issues but has instead relied only on the application's self-reported version number.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1918 advisory.

    libde265 is an open source implementation of the h.265 video codec. Prior to version 1.0.20, a crafted     H.265 bitstream can cause an out-of-bounds array write in     `decoder_context::process_reference_picture_set()` (`libde265/decctx.cc:1376`). The root cause is a     missing aggregate bound check on predicted short-term reference picture set entries. Individual list sizes     are validated, but the combined count after predicted RPS construction can exceed the 16-entry `PocStFoll`     array, writing at index 16. Version 1.0.20 patches the issue. (CVE-2026-49295)

    libde265 is an open source implementation of the h.265 video codec. Prior to version 1.0.20, a crafted     sequence of H.265 NAL units causes `decoder_context::read_slice_NAL()` (`libde265/decctx.cc:481`) to     attach slice headers to a finished picture objectthat has no active image unit, resulting in attacker-     controlled unbounded heap growth. The retained headers are never freed until the picture is released,     which may not happen during continuous streaming. Version 1.0.20 patches the issue. (CVE-2026-49337)

    libde265 is an open source implementation of the h.265 video codec. Prior to version 1.1.0, a crafted     H.265 bitstream with large SPS dimensions and 16-bit bit depth causes a signed integer overflow in     `de265_image_get_buffer()` (`libde265/image.cc:128`). The overflow wraps the plane allocation size to a     small value (~1 KB), but the subsequent `fill_image()` call computes the real size using `size_t`, writing     ~4 GB into the undersized heap buffer. Version 1.1.0 patches the issue. (CVE-2026-49346)

Tenable has extracted the preceding description block directly from the tested product 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 Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - libde265 is an open source implementation of the h.265 video codec. Prior to version 1.0.20, a crafted     sequence of H.265 NAL units causes `decoder_context::read_slice_NAL()` (`libde265/decctx.cc:481`) to     attach slice headers to a finished picture object that has no active image unit, resulting in attacker-     controlled unbounded heap growth. The retained headers are never freed until the picture is released,     which may not happen during continuous streaming. Version 1.0.20 patches the issue. (CVE-2026-49337)

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

ID	Name	Product	Family	Type	Severity
461868	Echo: libde265: security update to 1.0.15-1+e7	Tenable Cloud Security	Echo Local Security Checks	Local	medium
461868	Echo: libde265: security update to 1.0.15-1+e7	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	medium
348349	Debian dla-4789 : libde265-0 - security update	Nessus	Debian Local Security Checks	Local	high
333045	Debian dsa-6413 : libde265-0 - security update	Nessus	Debian Local Security Checks	Local	medium
327408	Amazon Linux 2023 : libde265, libde265-devel (ALAS2023-2026-1918)	Nessus	Amazon Linux Local Security Checks	Local	high
321839	Linux Distros Unpatched Vulnerability : CVE-2026-49337	Nessus	Misc.	Local	medium

Detections

Analytics

CVE-2026-49337

medium

Tenable Plugins

medium

medium

high

medium

high

medium