CVE-2026-47714 strukturag CVE debrief

Who should care

Users of libheif versions 1.21.2 and prior should update to version 1.22.0 or later to address the integer overflow vulnerability. Operators of affected systems should review and apply patches, monitor for potential exploitation attempts, and verify the integrity of their deployments. Security teams should prioritize patching and review compensating controls for exposed systems.

Technical summary

In libheif versions 1.21.2 and prior, the inline mask parsing code in `libheif/region.cc` contains an integer overflow. Both `width` and `height` are `unsigned int` (32-bit) values parsed from the HEIF file. Their product can exceed `UINT32_MAX`, wrapping to a small value before the division by 8. This causes an undersized buffer allocation, leading to out-of-bounds memory access when the mask data is later interpreted as a `width x height` bitmap. The issue has been patched in version 1.22.0.

Defensive priority

MEDIUM

Recommended defensive actions

• Update libheif to version 1.22.0 or later
• Review and apply patches for libheif
• Monitor for and respond to potential exploitation attempts
• Verify the integrity of affected deployments
• Review compensating controls for exposed systems
• Track exceptions and retest remediated assets
• Close the item only after evidence is documented

Evidence notes

The CVE record was published on 2026-07-21T21:16:51.617Z and was last modified on 2026-07-22T14:17:19.880Z. The NVD entry is currently MEDIUM. The vulnerability affects libheif versions 1.21.2 and prior. Users should verify their deployments and apply patches or mitigations as needed. Evidence is limited to public sources and may not reflect the full scope or impact of the vulnerability.

Official resources