CVE-2026-49271
libheif: Wrapped icef compressed-unit range check causes out-of-bounds read in uncompressed HEIF decoder
Description
libheif is a HEIF and AVIF file format decoder and encoder. Prior to version 1.22.1, the uncompressed HEIF decoder validates explicit icef compressed-unit offsets using unit_offset + unit_size. Because the addition can wrap, a crafted HEIF file can pass the range check and then construct a vector from iterators outside the compressed item buffer, producing an out-of-bounds heap read and crash. Version 1.22.1 patches the issue.
INFO
Published Date :
June 19, 2026, 6:16 p.m.
Last Modified :
June 26, 2026, 12:33 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | MITRE-CVE | ||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update libheif to version 1.22.1.
- Apply vendor-provided patches for libheif.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-49271.
| URL | Resource |
|---|---|
| https://github.com/strukturag/libheif/security/advisories/GHSA-r7qj-cg5r-r6vf | Mitigation Vendor Advisory |
| https://github.com/strukturag/libheif/security/advisories/GHSA-r7qj-cg5r-r6vf | Mitigation Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-49271 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-49271
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-49271 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-49271 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jun. 26, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:struktur:libheif:*:*:*:*:*:*:*:* versions up to (excluding) 1.22.1 Added Reference Type GitHub, Inc.: https://github.com/strukturag/libheif/security/advisories/GHSA-r7qj-cg5r-r6vf Types: Mitigation, Vendor Advisory Added Reference Type CISA-ADP: https://github.com/strukturag/libheif/security/advisories/GHSA-r7qj-cg5r-r6vf Types: Mitigation, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 22, 2026
Action Type Old Value New Value Added Reference https://github.com/strukturag/libheif/security/advisories/GHSA-r7qj-cg5r-r6vf Added SSVC {'id': 'CVE-2026-49271', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-06-22T17:01:07.409364Z'} -
New CVE Received by [email protected]
Jun. 19, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'strukturag', 'product': 'libheif', 'versions': [{'status': 'affected', 'version': '< 1.22.1'}]}] Added Description libheif is a HEIF and AVIF file format decoder and encoder. Prior to version 1.22.1, the uncompressed HEIF decoder validates explicit icef compressed-unit offsets using unit_offset + unit_size. Because the addition can wrap, a crafted HEIF file can pass the range check and then construct a vector from iterators outside the compressed item buffer, producing an out-of-bounds heap read and crash. Version 1.22.1 patches the issue. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Added CWE CWE-125 Added Reference https://github.com/strukturag/libheif/security/advisories/GHSA-r7qj-cg5r-r6vf