CVE-2026-32741

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Versions 1.21.2 and below contain a heap buffer overflow in MaskImageCodec::decode_mask_image(). When decoding a HEIF file containing a mask image (mski), the function copies the full iloc extent data into a pixel buffer using memcpy(dst, data.data(), data.size()). The copy length data.size() is determined by the iloc extent in the file (attacker-controlled), while the destination buffer is sized based on the declared image dimensions. Because no upper-bound check exists on the data length, a crafted file whose iloc extent exceeds the pixel buffer allocation overflows the heap. The vulnerable single-memcpy branch is reached when the mskC property specifies bits_per_pixel = 8 and the ispe property declares an even width \u2265 64 (so that stride == width), with no changes to default security limits or external codec plugins required. This issue has been fixed in version 1.22.0."}], "source": {"advisory": "GHSA-j3w5-7whq-p37q", "discovery": "UNKNOWN"}}, "adp": [{"references": [{"url": "https://github.com/strukturag/libheif/security/advisories/GHSA-j3w5-7whq-p37q", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-05-20T14:37:31.409194Z", "id": "CVE-2026-32741", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-05-20T15:46:03.623Z"}}, {"affected": [{"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/o:redhat:enterprise_linux:10"], "defaultStatus": "unaffected", "packageName": "glycin-loaders", "product": "Red Hat Enterprise Linux 10", "vendor": "Red Hat"}], "datePublic": "2026-05-19T19:57:26.525Z", "descriptions": [{"lang": "en", "value": "A flaw was found in libheif, a library for decoding and encoding HEIF (High Efficiency Image File Format) and AVIF files. 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The copy length data.size() is determined by the iloc extent in the file (attacker-controlled), while the destination buffer is sized based on the declared image dimensions. Because no upper-bound check exists on the data length, a crafted file whose iloc extent exceeds the pixel buffer allocation overflows the heap. The vulnerable single-memcpy branch is reached when the mskC property specifies bits_per_pixel = 8 and the ispe property declares an even width \u2265 64 (so that stride == width), with no changes to default security limits or external codec plugins required. This issue has been fixed in version 1.22.0."}, {"lang": "es", "value": "libheif es un decodificador y codificador de formato de archivo HEIF y AVIF. Las versiones 1.21.2 e inferiores contienen un desbordamiento de b\u00fafer de mont\u00f3n en MaskImageCodec::decode_mask_image(). Al decodificar un archivo HEIF que contiene una imagen de m\u00e1scara (mski), la funci\u00f3n copia los datos completos de la extensi\u00f3n iloc en un b\u00fafer de p\u00edxeles usando memcpy(dst, data.data(), data.size()). La longitud de copia data.size() est\u00e1 determinada por la extensi\u00f3n iloc en el archivo (controlada por el atacante), mientras que el b\u00fafer de destino se dimensiona en funci\u00f3n de las dimensiones de imagen declaradas. Debido a que no existe una comprobaci\u00f3n de l\u00edmite superior en la longitud de los datos, un archivo manipulado cuya extensi\u00f3n iloc excede la asignaci\u00f3n del b\u00fafer de p\u00edxeles desborda el mont\u00f3n. Se alcanza la rama vulnerable de single-memcpy cuando la propiedad mskC especifica bits_per_pixel = 8 y la propiedad ispe declara un ancho par ? 64 (de modo que stride == width), sin necesidad de cambios en los l\u00edmites de seguridad predeterminados o plugins de c\u00f3dec externos. Este problema ha sido solucionado en la versi\u00f3n 1.22.0."}], "id": "CVE-2026-32741", "lastModified": "2026-07-24T09:10:00.153", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 4.2, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 4.2, "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-32741", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-05-20T14:37:31.409194Z", "version": "2.0.3"}}]}, "published": "2026-05-19T21:16:42.073", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/strukturag/libheif/releases/tag/v1.22.0"}, {"source": "security-advisories@github.com", "url": "https://github.com/strukturag/libheif/security/advisories/GHSA-j3w5-7whq-p37q"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/security/cve/CVE-2026-32741"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2480002"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/strukturag/libheif/security/advisories/GHSA-j3w5-7whq-p37q"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-32741.json"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-122"}], "source": "security-advisories@github.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-120"}], "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}]}

{"bugzilla": {"description": "libheif: libheif: Heap buffer overflow vulnerability in image decoding", "id": "2480002", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2480002"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.1", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H", "status": "draft"}, "cwe": "CWE-120", "details": ["A flaw was found in libheif, a library for decoding and encoding HEIF (High Efficiency Image File Format) and AVIF files. A remote attacker could exploit a heap buffer overflow vulnerability in the MaskImageCodec::decode_mask_image() function by providing a specially crafted HEIF file containing a mask image. This vulnerability occurs because the function copies image data into a buffer without proper size validation, allowing the attacker-controlled input to exceed the allocated memory. Successful exploitation can lead to a denial of service (DoS) and potentially other impacts due to memory corruption."], "name": "CVE-2026-32741", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "glycin-loaders", "product_name": "Red Hat Enterprise Linux 10"}], "public_date": "2026-05-19T19:57:26Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-32741\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-32741\nhttps://github.com/strukturag/libheif/releases/tag/v1.22.0\nhttps://github.com/strukturag/libheif/security/advisories/GHSA-j3w5-7whq-p37q"], "threat_severity": "Important"}

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