PT-2026-26678 · Libde265 · Libde265

Kapnull · Published 2026-03-20 · Updated 2026-03-31 · CVE-2026-33165

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions libde265 versions prior to 1.0.17

Description libde265 is an open source implementation of the h.265 video codec. A crafted HEVC bitstream can cause an out-of-bounds heap write. This occurs due to a stale ctb info.log2unitSize after an SPS change where PicWidthInCtbsY and PicHeightInCtbsY remain constant, but Log2CtbSizeY changes. This leads to set SliceHeaderIndex indexing past the allocated image metadata array, resulting in a write beyond the bounds of a heap allocation.

Recommendations Update to libde265 version 1.0.17 or later.

Exploit

Fix

Memory Corruption

Weakness Enumeration

CWE-787

Related Identifiers

CVE-2026-33165

ECHO-FDBA-52AF-519E

GHSA-653Q-9F73-8HVG

Affected Products

Libde265

References · 15

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33165.json · Exploit
• https://github.com/strukturag/libde265/security/advisories/GHSA-653q-9f73-8hvg · Patch
• https://github.com/strukturag/libde265/commit/c7891e412106130b83f8e8ea8b7f907e9449b658 · Patch
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-33165 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-33165 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-33165 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-33165 · Security Note
• https://osv.dev/vulnerability/ROOT-OS-DEBIAN-12-CVE-2026-33165 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-33165 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-33165 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2026-33165 · Vendor Advisory
• https://github.com/strukturag/libde265/releases/tag/v1.0.17 · Note
• https://twitter.com/dailycve/status/2036277079663169995 · Twitter Post
• https://twitter.com/CVEnew/status/2035262152299188395 · Twitter Post
• https://twitter.com/cyberbivash/status/2035112245764514132 · Twitter Post