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.

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     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)

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

ID	Name	Product	Family	Type	Severity
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
321841	Linux Distros Unpatched Vulnerability : CVE-2026-49295	Nessus	Misc.	Local	high

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