What’s Vulnerable › Vulnerabilities

CVE-2026-84447: libheif: Derived-image indirect reference chains and tiled offsets bypass decode caching and MemoryHandle limits, causing CPU/memory amplification DoS

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-18 · updated 2026-09-18
• Weakness: CWE-770

Description

libheif is a HEIF and AVIF file format decoder and encoder. In 1.23.1 and earlier, crafted grid, iovl, and iden reference graphs can repeatedly decode the same base image because processed_ids is copied per branch and ImageItem::decode_image() has no shared operation budget. This vulnerability is fixed in 1.23.2.

Affected products

• strukturag libheif: before 1.23.2

References

• https://github.com/strukturag/libheif/commit/30b52a4e829efe0ee6d7208e8500b99f664af5e9
• https://github.com/strukturag/libheif/releases/tag/v1.23.2
• https://github.com/strukturag/libheif/security/advisories/GHSA-x8xm-cm2c-cfc8
• https://github.com/strukturag/libheif/security/advisories/GHSA-x8xm-cm2c-cfc8

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