CVE-2026-49337: strukturag libde265
Vulnerability summary
CVE-2026-49337 is a medium (CVSS 4.3) vulnerability in strukturag libde265. EPSS estimates a 0.33% chance of exploitation in the next 30 days, higher than 24.5% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 2 · Related 1Timeline
- 19-06-2026PublishedVulnerability first disclosed.
- 22-06-2026Last modifiedVulnerability information updated.
Description
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.
CVSS metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated4.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
- OSV · DebianEcosystem advisory · calculated4.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
- NVDNIST4.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
EPSS trend
Probability
0.33%
Chance of exploitation in the next 30 days
Percentile
25%
Versus all other CVEs
30-day change
+0.13 pp
From 0.19% on 21-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Debian1 product
- libde265< 1.0.11-1+deb12u3 | < 1.0.15-1+deb13u1 | < 1.1.1-1
Strukturag1 product
- libde265< 1.0.20
Ubuntu1 product
- libde265< 1.0.2-2ubuntu0.16.04.1~esm6 | < 1.0.2-2ubuntu0.18.04.1~esm6 | < 1.0.4-1ubuntu0.4+esm2 | < 1.0.8-1ubuntu0.3+esm2 | < 1.0.15-1ubuntu0.1 | All versions (No fix recorded) | < 1.0.16-1ubuntu0.1~esm1
3 vendors · 3 products
