CVE-2026-84446 Details
Description
libheif is a HEIF and AVIF file format decoder and encoder. Prior to 1.23.2, crafted HEIF sequence timing and edit-list data can make Track::init_sample_timing_table() compute a logical m_num_output_samples value that exceeds the uint32_t counters used by Track_Visual::decode_next_image_sample() and Track::get_next_sample_raw_data(). The resulting comparison can never reach the oversized output count, causing non-terminating decode or raw-sample loops and bypassing max_sequence_frames. The same sequence path repeatedly calls Box_stts::get_sample_duration() and allocates Chunk::m_sample_ranges and Track::m_presentation_timeline outside MemoryHandle accounting, allowing severe CPU and memory exhaustion from a small file. This issue is fixed in version 1.23.2.
A vulnerability in libheif, a HEIF and AVIF file format decoder and encoder, allows for denial-of-service (DoS) attacks through unbounded memory allocation and non-terminating decode loops. This issue arises in versions of libheif prior to 1.23.2, when crafted HEIF sequence timing and edit-list data cause the Track::init_sample_timing_table() function to calculate an output sample value that exceeds the limits of the uint32_t counters used in related decoding functions. The flaw can be exploited by sending a malicious HEIF file, leading to severe CPU and memory exhaustion.
Users are advised to upgrade to libheif version 1.23.2, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 18, 2026CISA-ADP
Assessed Sep 18, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/strukturag/libheif/commit/3a7a69ae325f652e48c026b8241ab25bedf44d9b | [email protected] | Source CodeVendor |
| https://github.com/strukturag/libheif/releases/tag/v1.23.2 | [email protected] | Release NotesVendor |
| https://github.com/strukturag/libheif/security/advisories/GHSA-xw34-mjcp-jqh8 | [email protected] | AdvisoryBundleRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-835 | Loop with Unreachable Exit Condition ('Infinite Loop') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| libheif | <= 1.23.1 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 21, 2026 | CVE Modified | CISA-ADP |
| Sep 18, 2026 | New CVE Received | [email protected] |