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Vulnerability · Published Jul 21, 2026 · Assigned by GitHub_M

CVE-2026-45383libde265 has a heap buffer overflow (OOB read) in decode_slice_unit_WPP() via out-of-bounds CtbAddrRStoTS access — libde265 <= v1.0.18

Medium 6.9

In plain English

A medium-severity out-of-bounds read in libde265 from strukturag. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)6.9Medium
Exploit odds (30 days)0.4%top 63.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

libde265 is an open source implementation of the h.265 video codec. Versions prior to 1.0.19 have a heap buffer overflow (out-of-bounds READ) exists in `decoder_context::decode_slice_unit_WPP()` in `libde265/decctx.cc`. When decoding a WPP (Wavefront Parallel Processing) HEVC slice, `ctbAddrRS` is computed as `ctbRow * ctbsWidth` inside the entry-point loop. If the PPS/SPS headers are crafted so that this value exceeds `pps.CtbAddrRStoTS.size()`, the subsequent array access `pps.CtbAddrRStoTS[ctbAddrRS]` reads past the end of the allocated vector, triggering a heap-buffer-overflow confirmed by AddressSanitizer. Version 1.0.19 patches the issue.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.24libde2651.1.3-r0ALPINE-CVE-2026-45383
Debian:12libde2651.0.11-1+deb12u3DEBIAN-CVE-2026-45383
Debian:13libde2651.0.15-1+deb13u1DEBIAN-CVE-2026-45383
Debian:14libde2651.1.1-1DEBIAN-CVE-2026-45383
Ubuntu:24.04:LTSlibde2651.0.15-1ubuntu0.1USN-8573-1
Ubuntu:24.04:LTSlibde2651.0.15-1ubuntu0.1UBUNTU-CVE-2026-45383
Ubuntu:25.10libde265no fix listedUBUNTU-CVE-2026-45383

Affected products (as reported)

VendorProductVersions
strukturag libde265 < 1.0.19

Weakness: CWE-125 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

References