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PatchSiren cyber security CVE debrief

CVE-2026-47714 strukturag CVE debrief

CVE-2026-47714 is a MEDIUM severity vulnerability in libheif, a HEIF and AVIF file format decoder and encoder. An integer overflow in the inline mask parsing in `libheif/region.cc` can lead to out-of-bounds memory access. The issue was patched in version 1.22.0. Affected users should update to version 1.22.0 or later to address the vulnerability. The vulnerability has been publicly disclosed and may be subject to exploitation.

Vendor
strukturag
Product
libheif
CVSS
MEDIUM 6.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-21
Original CVE updated
2026-07-22
Advisory published
2026-07-21
Advisory updated
2026-07-22

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.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-47714 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-47714

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-47714 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-47714

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.