CVE-2026-32740

{"id": "CVE-2026-32740", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.8, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 2.8}]}, "published": "2026-05-19T20:16:18.917", "references": [{"url": "https://github.com/strukturag/libheif/releases/tag/v1.22.0", "tags": ["Release Notes"], "source": "security-advisories@github.com"}, {"url": "https://github.com/strukturag/libheif/security/advisories/GHSA-frfr-f3vg-2g6j", "tags": ["Exploit", "Vendor Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-787"}]}], "descriptions": [{"lang": "en", "value": "libheif is a HEIF and AVIF file format decoder and encoder. Versions 1.21.2 and prior contain a heap-buffer-overflow (write) vulnerability in the grid tile compositing, allowing an attacker to write 64 bytes of fully attacker-controlled data past the end of a chroma plane heap allocation by crafting a HEIF/AVIF file with a 1\u00d74 grid of odd-height tiles. The overflow is triggered during normal image decoding with default build configuration. The written bytes are chroma (Cb/Cr) pixel values from the attacking tile, giving the attacker full control over the overflow content. This issue has been fixed in version 1.22.0."}], "lastModified": "2026-05-21T14:16:45.000", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:struktur:libheif:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "CB01CAAF-1D64-461B-8CC0-3CF2FBAC60A5", "versionEndExcluding": "1.22.0"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}