Vulnerability · Published Jul 21, 2026 · Assigned by GitHub_M

CVE-2026-45382libde265 has a heap-buffer-overflow READ in decode_slice_unit_tiles via unvalidated PPS tile geometry

Medium 6.9

In plain English

A medium-severity out-of-bounds read in libde265 from strukturag. Proof-of-concept exploit code is public. 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 62.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

libde265 is an open source implementation of the h.265 video codec. Prior to version 1.0.19, `decoder_context::decode_slice_unit_tiles` (libde265/decctx.cc:920) reads `pps.CtbAddrRStoTS[ctbAddrRS]` at line 966 where `ctbAddrRS = ctbY * ctbsWidth + ctbX` is computed from PPS-supplied `colBd[]`/`rowBd[]` arrays without validating the result against `CtbAddrRStoTS.size() == sps->PicSizeInCtbsY`. A malformed PPS that passes `set_derived_values` but encodes geometry inconsistent with the SPS produces a `ctbAddrRS` past the allocation, causing a 4-byte heap-buffer-overflow READ. Version 1.0.19 fixes the issue.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Alpine:v3.24	libde265	1.1.3-r0	ALPINE-CVE-2026-45382
Debian:12	libde265	1.0.11-1+deb12u3	DEBIAN-CVE-2026-45382
Debian:13	libde265	1.0.15-1+deb13u1	DEBIAN-CVE-2026-45382
Debian:14	libde265	1.1.1-1	DEBIAN-CVE-2026-45382
Ubuntu:24.04:LTS	libde265	1.0.15-1ubuntu0.1	USN-8573-1
Ubuntu:24.04:LTS	libde265	1.0.15-1ubuntu0.1	UBUNTU-CVE-2026-45382
Ubuntu:25.10	libde265	no fix listed	UBUNTU-CVE-2026-45382

Affected products (as reported)

Vendor	Product	Versions
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

https://github.com/strukturag/libde265/security/advisories/GHSA-hwhx-x2mq-ccr9 x_refsource_CONFIRM