CVE-2026-45383 Memory corruption in libde265
A heap buffer overflow in libde265 allows attackers to cause denial of service or disclose memory contents via crafted HEVC video files.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-45383?
CVE-2026-45383 is a medium-severity memory corruption vulnerability in strukturag libde265, published on 21 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-125
Which versions are affected by CVE-2026-45383?
How do I fix CVE-2026-45383?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-45383 being exploited?
There is no known exploitation of CVE-2026-45383 in the wild and no public exploit code.
Sources
Also known as ALPINE-CVE-2026-45383, BELL-CVE-2026-45383, DEBIAN-CVE-2026-45383, ECHO-0910-d342-f525, GHSA-wg9q-ppqw-6q38, ROOT-OS-DEBIAN-11-CVE-2026-45383 and 1 more.