CVE-2026-62377

Publication date 18 August 2026

Last updated 18 September 2026

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

4.3 · Medium

Score breakdown

Description

libheif is a HEIF and AVIF file format decoder and encoder. In 1.23.0 and earlier, a crafted HEIF sequence accepted by heif_context_read_from_memory() can leave the context with no registered sequence tracks and crash when heif_context_get_track(ctx, 0) is called. HeifContext::get_track() in libheif/context.cc executes assert(has_sequence()) before its normal error handling, so assert-enabled builds abort instead of allowing the public wrapper in libheif/api/libheif/heif_sequences.cc to return null. In release builds, removing the assertion lets the track_id zero path dereference m_tracks.begin()->second on an empty map, which is undefined behavior and typically crashes. The issue is reachable through documented public APIs after parsing attacker-controlled bytes. This issue is fixed in version 1.23.1.

Read the notes from the security team

Status

Package Ubuntu Release Status
libheif 26.04 LTS resolute
Fixed 1.21.2-3ubuntu0.5
24.04 LTS noble
Not affected
22.04 LTS jammy
Not affected
20.04 LTS focal
Not affected
18.04 LTS bionic
Not affected

Notes

kkernick

get_track was introduced with 6925330 in 1.20.0

Patch details

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Package Patch details
libheif

Severity score breakdown

CVSS version: CVSS v3.0

Base score 4.3 · Medium

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

References

Related Ubuntu Security Notices (USN)

    • USN-8774-1
    • libheif vulnerabilities
    • 16 September 2026

Other references

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