strukturag libheif up to 1.23.0 Decoder libheif/context.cc HeifContext::get_track null pointer dereference

Summaryinfo

A vulnerability marked as problematic has been reported in strukturag libheif up to 1.23.0. This affects the function HeifContext::get_track of the file libheif/context.cc of the component Decoder. This manipulation causes null pointer dereference. This vulnerability appears as CVE-2026-62377. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability has been found in strukturag libheif up to 1.23.0 and classified as problematic. Affected by this vulnerability is the function HeifContext::get_track of the file libheif/context.cc of the component Decoder. The manipulation with an unknown input leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. As an impact it is known to affect availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-62377 since 07/14/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available.

Upgrading to version 1.23.1 eliminates this vulnerability.

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Productinfo

Vendor

• strukturag

Name

• libheif

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12
• 1.13
• 1.14
• 1.15
• 1.16
• 1.17
• 1.18
• 1.19
• 1.20
• 1.21
• 1.22
• 1.23.0

Website

• Product: https://github.com/strukturag/libheif/

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