CVE-2026-49271: CWE-125: Out-of-bounds Read in strukturag libheif
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.
AI Analysis
Technical Summary
libheif versions before 1.22.1 contain an out-of-bounds read vulnerability (CWE-125) in the uncompressed HEIF decoder. The vulnerability arises because the addition of unit_offset and unit_size can wrap around, allowing a crafted HEIF file to bypass range checks and cause the decoder to construct a vector from iterators outside the compressed item buffer. This results in an out-of-bounds heap read and potential crash. The issue is addressed in libheif version 1.22.1.
Potential Impact
An attacker can craft a malicious HEIF file that triggers an out-of-bounds heap read in libheif, leading to a denial of service (application crash). There is no indication of confidentiality or integrity impact. The CVSS score is 6.5 (medium severity) reflecting network attack vector, low attack complexity, no privileges required, user interaction required, and impact limited to availability.
Mitigation Recommendations
Upgrade libheif to version 1.22.1 or later, where this vulnerability is patched. No other mitigation or temporary fix is indicated.
CVE-2026-49271: CWE-125: Out-of-bounds Read in strukturag libheif
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.
CVSS v3.1
Score 6.5medium
Affected software
pkg:github/strukturag/libheifRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
libheif versions before 1.22.1 contain an out-of-bounds read vulnerability (CWE-125) in the uncompressed HEIF decoder. The vulnerability arises because the addition of unit_offset and unit_size can wrap around, allowing a crafted HEIF file to bypass range checks and cause the decoder to construct a vector from iterators outside the compressed item buffer. This results in an out-of-bounds heap read and potential crash. The issue is addressed in libheif version 1.22.1.
Potential Impact
An attacker can craft a malicious HEIF file that triggers an out-of-bounds heap read in libheif, leading to a denial of service (application crash). There is no indication of confidentiality or integrity impact. The CVSS score is 6.5 (medium severity) reflecting network attack vector, low attack complexity, no privileges required, user interaction required, and impact limited to availability.
Mitigation Recommendations
Upgrade libheif to version 1.22.1 or later, where this vulnerability is patched. No other mitigation or temporary fix is indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-28T20:07:58.860Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a358c5cf198dc38c1f2fbc3
Added to database: 06/19/2026, 18:37:16 UTC
Last enriched: 06/26/2026, 19:19:59 UTC
Last updated: 08/04/2026, 12:46:13 UTC
Views: 76
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