What’s Vulnerable › Vulnerabilities

CVE-2026-33165: heap out-of-bounds write in libde265 1.0.16

• Severity: medium (CVSS 5.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-20 · updated 2026-06-17
• Weakness: CWE-787

Description

libde265 is an open source implementation of the h.265 video codec. Prior to version 1.0.17, a crafted HEVC bitstream causes an out-of-bounds heap write confirmed by AddressSanitizer. The trigger is a stale ctb_info.log2unitSize after an SPS change where PicWidthInCtbsY and PicHeightInCtbsY stay constant but Log2CtbSizeY changes, causing set_SliceHeaderIndex to index past the allocated image metadata array and write 2 bytes past the end of a heap allocation. This issue has been patched in version 1.0.17.

Affected products

• strukturag libde265: before 1.0.17 — fixed in 1.0.17

How to fix

Upgrade to a fixed version: strukturag libde265 1.0.17. Check the vendor advisory for mitigations.

References

• https://github.com/strukturag/libde265/commit/c7891e412106130b83f8e8ea8b7f907e9449b658
• https://github.com/strukturag/libde265/releases/tag/v1.0.17
• https://github.com/strukturag/libde265/security/advisories/GHSA-653q-9f73-8hvg

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