CVE-2025-68431

libheif is an HEIF and AVIF file format decoder and encoder. Prior to version 1.21.0, a crafted HEIF that exercises the overlay image item path triggers a heap buffer over-read in `HeifPixelImage::overlay()`. The function computes a negative row length (likely from an unclipped overlay rectangle or invalid offsets), which then underflows when converted to `size_t` and is passed to `memcpy`, causing a very large read past the end of the source plane and a crash. Version 1.21.0 contains a patch. As a workaround, avoid decoding images using `iovl` overlay boxes.

CVSS v3 6.5 MEDIUM

6.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/strukturag/libheif/commit/b8c12a7b70f46c9516711a988483bed377b78d46	Patch
https://github.com/strukturag/libheif/releases/tag/v1.21.0	Product Release Notes
https://github.com/strukturag/libheif/security/advisories/GHSA-j87x-4gmq-cqfq	Exploit Patch Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:struktur:libheif:*:*:*:*:*:*:*:*

History

07 Oct 2026, 12:10

Type	Values Removed	Values Added
Summary		(es) libheif es un decodificador y codificador de formato de archivo HEIF y AVIF. Antes de la versión 1.21.0, un HEIF manipulado que ejerce la ruta del elemento de imagen de superposición desencadena una lectura excesiva del búfer de pila en 'HeifPixelImage::overlay()'. La función calcula una longitud de fila negativa (probablemente de un rectángulo de superposición no recortado o de desplazamientos no válidos), lo que luego provoca un desbordamiento negativo cuando se convierte a 'size_t' y se pasa a 'memcpy', causando una lectura muy grande más allá del final del plano de origen y un fallo. La versión 1.21.0 contiene un parche. Como solución alternativa, evite decodificar imágenes usando cajas de superposición 'iovl'.

Information

Published : 2025-12-29 19:15

Updated : 2026-10-07 12:10

NVD link : CVE-2025-68431

Mitre link : CVE-2025-68431

CVE.ORG link : CVE-2025-68431

JSON object : View

Products Affected

struktur

libheif

CWE

CWE-125

Out-of-bounds Read

CWE-190

Integer Overflow or Wraparound

{"id": "CVE-2025-68431", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-68431", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2025-12-30T21:54:12.455580Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.5, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 2.8}, {"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.1, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}, "impactScore": 4.2, "exploitabilityScore": 2.8}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "strukturag", "product": "libheif", "versions": [{"status": "affected", "version": "< 1.21.0"}]}]}], "published": "2025-12-29T19:15:56.933", "references": [{"url": "https://github.com/strukturag/libheif/commit/b8c12a7b70f46c9516711a988483bed377b78d46", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/strukturag/libheif/releases/tag/v1.21.0", "tags": ["Product", "Release Notes"], "source": "security-advisories@github.com"}, {"url": "https://github.com/strukturag/libheif/security/advisories/GHSA-j87x-4gmq-cqfq", "tags": ["Exploit", "Patch", "Vendor Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-125"}, {"lang": "en", "value": "CWE-190"}]}], "descriptions": [{"lang": "en", "value": "libheif is an HEIF and AVIF file format decoder and encoder. Prior to version 1.21.0, a crafted HEIF that exercises the overlay image item path triggers a heap buffer over-read in `HeifPixelImage::overlay()`. The function computes a negative row length (likely from an unclipped overlay rectangle or invalid offsets), which then underflows when converted to `size_t` and is passed to `memcpy`, causing a very large read past the end of the source plane and a crash. Version 1.21.0 contains a patch. As a workaround, avoid decoding images using `iovl` overlay boxes."}, {"lang": "es", "value": "libheif es un decodificador y codificador de formato de archivo HEIF y AVIF. Antes de la versi\u00f3n 1.21.0, un HEIF manipulado que ejerce la ruta del elemento de imagen de superposici\u00f3n desencadena una lectura excesiva del b\u00fafer de pila en 'HeifPixelImage::overlay()'. La funci\u00f3n calcula una longitud de fila negativa (probablemente de un rect\u00e1ngulo de superposici\u00f3n no recortado o de desplazamientos no v\u00e1lidos), lo que luego provoca un desbordamiento negativo cuando se convierte a 'size_t' y se pasa a 'memcpy', causando una lectura muy grande m\u00e1s all\u00e1 del final del plano de origen y un fallo. La versi\u00f3n 1.21.0 contiene un parche. Como soluci\u00f3n alternativa, evite decodificar im\u00e1genes usando cajas de superposici\u00f3n 'iovl'."}], "lastModified": "2026-10-07T12:10:00.170", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:struktur:libheif:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "BBD4D6C6-A38E-4C2C-AB9D-F82441BE2D4F", "versionEndExcluding": "1.21.0"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}