CVE-2026-33165

Publication date 20 March 2026

Last updated 20 July 2026

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

5.5 · Medium

Score breakdown

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.

Status

Package Ubuntu Release Status
libde265 26.04 LTS resolute
Fixed 1.0.16-1ubuntu0.1~esm1
25.10 questing Ignored end of life, was needed
24.04 LTS noble
Fixed 1.0.15-1ubuntu0.1
22.04 LTS jammy
Fixed 1.0.8-1ubuntu0.3+esm2
20.04 LTS focal
Fixed 1.0.4-1ubuntu0.4+esm2
18.04 LTS bionic
Fixed 1.0.2-2ubuntu0.18.04.1~esm6
16.04 LTS xenial Ignored end of ESM support, was needed

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Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
libde265

Severity score breakdown

CVSS version: CVSS v3.0

Base score 5.5 · Medium

Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

    • USN-8573-1
    • libde265 vulnerabilities
    • 20 July 2026

Other references

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