Quick answers
- Is CVE-2026-49271 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-49271 being exploited in the wild.
- How severe is CVE-2026-49271?
- Medium severity, with a CVSS score of 6.5, published 19 June 2026.
- Which products and versions are affected?
- strukturag libheif < 1.22.1.
- Is there a fix for CVE-2026-49271?
- A patch was published on 2026-06-19: Version 1.22.1 released Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-49271 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-49271?
- Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
An out-of-bounds read vulnerability exists in libheif's uncompressed HEIF decoder (unc_decoder.cc) due to an integer overflow in a range check. The function unc_decoder::get_compressed_image_data_uncompressed validates 'icef' compressed-unit offsets using the addition 'unit_offset + unit_size'. An attacker can provide a crafted HEIF file with values that wrap around, bypassing the check and allowing the construction of iterators outside the compressed item buffer. This results in a heap-based out-of-bounds read and a process crash. The vulnerability is reachable when the 'cmpC' compressed unit type is not 'image_tile' and requires the user to open a malicious file. The issue is fixed in version 1.22.1 by implementing proper subtraction-based bounds checking.
Affected products
- strukturag libheif < 1.22.1
Timeline
- 2026-05-25: advisory: GitHub Security Advisory published
- 2026-06-19: disclosed: CVE published to NVD
- 2026-06-19: patched: Version 1.22.1 released