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Fencer Vulns
medium 4.3

CVE-2026-49337 json

libde265 has an unbounded memory leak via orphaned slice headers in `read_slice_NAL`

published 2026-06-19 4 mo ago modified 2026-10-25 14 d ago also EUVD-2026-38078

cvss
4.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 14%
public exploits
0
none known

Summary

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.

Patch / fix

  • libde265 Debian 12 1.0.11-1+deb12u3
  • libde265 Debian 13 1.0.15-1+deb13u1
  • libde265 Debian 14 1.1.1-1

debian advisories DEBIAN-CVE-2026-49337

  • libde265 Ubuntu 24.04 LTS 1.0.15-1ubuntu0.1
  • libde265 Ubuntu Pro 16.04 LTS 1.0.2-2ubuntu0.16.04.1~esm6
  • libde265 Ubuntu Pro 18.04 LTS 1.0.2-2ubuntu0.18.04.1~esm6
  • libde265 Ubuntu Pro 20.04 LTS 1.0.4-1ubuntu0.4+esm2
  • libde265 Ubuntu Pro 22.04 LTS 1.0.8-1ubuntu0.3+esm2
  • libde265 Ubuntu Pro 26.04 LTS 1.0.16-1ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2026-49337

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • libde265 Alpine 3.24 1.1.3-r0

alpine advisories ALPINE-CVE-2026-49337

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.24% chance of exploitation in the next 30 days, higher than 14% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/strukturag/libde265/security/advisories/GHSA-g5hj-rf9f-7vxm referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

Affected products

  • strukturag libde265

Classification

Weakness
  • CWE-770 Allocation of Resources Without Limits or Throttling

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.