{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-33636", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-03-23T14:24:11.619Z", "datePublished": "2026-03-26T16:51:58.289Z", "dateUpdated": "2026-03-26T18:45:26.631Z"}, "containers": {"cna": {"title": "LIBPNG has ARM NEON Palette Expansion Out-of-Bounds Read on AArch64", "problemTypes": [{"descriptions": [{"cweId": "CWE-125", "lang": "en", "description": "CWE-125: Out-of-bounds Read", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-787", "lang": "en", "description": "CWE-787: Out-of-bounds Write", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.6, "baseSeverity": "HIGH", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H", "version": "3.1"}}], "references": [{"name": "https://github.com/pnggroup/libpng/security/advisories/GHSA-wjr5-c57x-95m2", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/pnggroup/libpng/security/advisories/GHSA-wjr5-c57x-95m2"}, {"name": "https://github.com/pnggroup/libpng/commit/7734cda20cf1236aef60f3bbd2267c97bbb40869", "tags": ["x_refsource_MISC"], "url": "https://github.com/pnggroup/libpng/commit/7734cda20cf1236aef60f3bbd2267c97bbb40869"}, {"name": "https://github.com/pnggroup/libpng/commit/aba9f18eba870d14fb52c5ba5d73451349e339c3", "tags": ["x_refsource_MISC"], "url": "https://github.com/pnggroup/libpng/commit/aba9f18eba870d14fb52c5ba5d73451349e339c3"}], "affected": [{"vendor": "pnggroup", "product": "libpng", "versions": [{"version": ">= 1.6.36, < 1.6.56", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-03-26T16:51:58.289Z"}, "descriptions": [{"lang": "en", "value": "LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. In versions 1.6.36 through 1.6.55, an out-of-bounds read and write exists in libpng's ARM/AArch64 Neon-optimized palette expansion path. When expanding 8-bit paletted rows to RGB or RGBA, the Neon loop processes a final partial chunk without verifying that enough input pixels remain. Because the implementation works backward from the end of the row, the final iteration dereferences pointers before the start of the row buffer (OOB read) and writes expanded pixel data to the same underflowed positions (OOB write). This is reachable via normal decoding of attacker-controlled PNG input if Neon is enabled. Version 1.6.56 fixes the issue."}], "source": {"advisory": "GHSA-wjr5-c57x-95m2", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-03-26T18:45:14.491475Z", "id": "CVE-2026-33636", "options": [{"Exploitation": "none"}, {"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": "2026-03-26T18:45:26.631Z"}}]}}

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{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:libpng:libpng:*:*:*:*:*:*:*:*", "matchCriteriaId": "CF5DCAF0-FA3A-48A5-857E-C3D960A27025", "versionEndExcluding": "1.6.56", "versionStartIncluding": "1.6.36", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. In versions 1.6.36 through 1.6.55, an out-of-bounds read and write exists in libpng's ARM/AArch64 Neon-optimized palette expansion path. When expanding 8-bit paletted rows to RGB or RGBA, the Neon loop processes a final partial chunk without verifying that enough input pixels remain. Because the implementation works backward from the end of the row, the final iteration dereferences pointers before the start of the row buffer (OOB read) and writes expanded pixel data to the same underflowed positions (OOB write). This is reachable via normal decoding of attacker-controlled PNG input if Neon is enabled. Version 1.6.56 fixes the issue."}, {"lang": "es", "value": "LIBPNG es una biblioteca de referencia para uso en aplicaciones que leen, crean y manipulan archivos de imagen r\u00e1ster PNG (Portable Network Graphics). En las versiones 1.6.36 a 1.6.55, existe una lectura y escritura fuera de l\u00edmites en la ruta de expansi\u00f3n de paleta optimizada para Neon de ARM/AArch64 de libpng. Al expandir filas paletizadas de 8 bits a RGB o RGBA, el bucle Neon procesa un fragmento parcial final sin verificar que queden suficientes p\u00edxeles de entrada. Debido a que la implementaci\u00f3n funciona hacia atr\u00e1s desde el final de la fila, la iteraci\u00f3n final desreferencia punteros antes del inicio del b\u00fafer de fila (lectura OOB) y escribe datos de p\u00edxeles expandidos en las mismas posiciones de desbordamiento inferior (escritura OOB). Esto es alcanzable a trav\u00e9s de la decodificaci\u00f3n normal de entrada PNG controlada por el atacante si Neon est\u00e1 habilitado. La versi\u00f3n 1.6.56 corrige el problema."}], "id": "CVE-2026-33636", "lastModified": "2026-04-02T18:42:02.667", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.6, "baseSeverity": "HIGH", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 4.7, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-03-26T17:16:41.477", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/pnggroup/libpng/commit/7734cda20cf1236aef60f3bbd2267c97bbb40869"}, {"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/pnggroup/libpng/commit/aba9f18eba870d14fb52c5ba5d73451349e339c3"}, {"source": "security-advisories@github.com", "tags": ["Vendor Advisory", "Patch"], "url": "https://github.com/pnggroup/libpng/security/advisories/GHSA-wjr5-c57x-95m2"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}, {"lang": "en", "value": "CWE-787"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{"bugzilla": {"description": "libpng: libpng: Information disclosure and denial of service via out-of-bounds read/write in Neon palette expansion", "id": "2451819", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2451819"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.6", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H", "status": "draft"}, "cwe": "CWE-124", "details": ["A flaw was found in libpng. A remote attacker could exploit an out-of-bounds read and write vulnerability in the ARM/AArch64 Neon-optimized palette expansion path. This occurs when processing a final partial chunk of 8-bit paletted rows without verifying sufficient input pixels, leading to dereferencing pointers before the start of the row buffer and writing expanded pixel data to underflowed positions. This flaw can result in information disclosure and denial of service."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."}, "name": "CVE-2026-33636", "package_state": [{"cpe": "cpe:/a:redhat:openjdk_els:11", "fix_state": "Affected", "package_name": "java-11-openjdk", "product_name": "Red Hat build of OpenJDK 11 ELS"}, {"cpe": "cpe:/a:redhat:openjdk_els:11", "fix_state": "Affected", "package_name": "java-11-openjdk-portable", "product_name": "Red Hat build of OpenJDK 11 ELS"}, {"cpe": "cpe:/a:redhat:openjdk_els:11", "fix_state": "Affected", "package_name": "java-17-openjdk", "product_name": "Red Hat build of OpenJDK 11 ELS"}, {"cpe": "cpe:/a:redhat:openjdk_els:11", "fix_state": "Affected", "package_name": "java-21-openjdk", "product_name": "Red Hat build of OpenJDK 11 ELS"}, {"cpe": "cpe:/a:redhat:openjdk_els:11", "fix_state": "Affected", "package_name": "java-21-openjdk-vanilla", "product_name": "Red Hat build of OpenJDK 11 ELS"}, {"cpe": "cpe:/a:redhat:openjdk_els:11", "fix_state": "Affected", "package_name": "java-25-openjdk-portable", "product_name": "Red Hat build of OpenJDK 11 ELS"}, {"cpe": "cpe:/a:redhat:openjdk:17", "fix_state": "Affected", "package_name": "java-17-openjdk", "product_name": "Red Hat build of OpenJDK 17"}, {"cpe": "cpe:/a:redhat:openjdk:17", "fix_state": "Affected", "package_name": "java-17-openjdk-portable", "product_name": "Red Hat build of OpenJDK 17"}, {"cpe": "cpe:/a:redhat:openjdk:17", "fix_state": "Affected", "package_name": "java-21-openjdk", "product_name": "Red Hat build of OpenJDK 17"}, {"cpe": "cpe:/a:redhat:openjdk:17", "fix_state": "Affected", "package_name": "java-21-openjdk-vanilla", "product_name": "Red Hat build of OpenJDK 17"}, {"cpe": "cpe:/a:redhat:openjdk:17", "fix_state": "Affected", "package_name": "java-25-openjdk-portable", "product_name": "Red Hat build of OpenJDK 17"}, {"cpe": "cpe:/a:redhat:openjdk:1.8", "fix_state": "Affected", "package_name": "java-17-openjdk", "product_name": "Red Hat build of OpenJDK 1.8"}, {"cpe": "cpe:/a:redhat:openjdk:1.8", "fix_state": "Affected", "package_name": "java-1.8.0-openjdk-portable", "product_name": "Red Hat build of OpenJDK 1.8"}, {"cpe": "cpe:/a:redhat:openjdk:1.8", "fix_state": "Affected", "package_name": "java-21-openjdk", "product_name": "Red Hat build of OpenJDK 1.8"}, {"cpe": "cpe:/a:redhat:openjdk:1.8", "fix_state": "Affected", "package_name": "java-21-openjdk-vanilla", "product_name": "Red Hat build of OpenJDK 1.8"}, {"cpe": "cpe:/a:redhat:openjdk:21", "fix_state": "Affected", "package_name": "java-17-openjdk", "product_name": "Red Hat build of OpenJDK 21"}, {"cpe": "cpe:/a:redhat:openjdk:21", "fix_state": "Affected", "package_name": "java-21-openjdk", "product_name": "Red Hat build of OpenJDK 21"}, {"cpe": 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"java-25-openjdk", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "libpng", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Affected", "package_name": "libpng", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "libpng", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "libpng12", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", 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"cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "mingw-libpng", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "java-17-openjdk", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "java-1.8.0-openjdk", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "java-21-openjdk", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "java-25-openjdk", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "libpng", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "libpng15", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-03-26T16:51:58Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-33636\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-33636\nhttps://github.com/pnggroup/libpng/commit/7734cda20cf1236aef60f3bbd2267c97bbb40869\nhttps://github.com/pnggroup/libpng/commit/aba9f18eba870d14fb52c5ba5d73451349e339c3\nhttps://github.com/pnggroup/libpng/security/advisories/GHSA-wjr5-c57x-95m2"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[1.6.36,1.6.56)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "libpng", "source": "cna", "vendor": "pnggroup"}, "product": "libpng", "vendor": "pnggroup"}], "analysis": {"en": {"generated_at": "2026-04-02T22:16:25.920152+00:00", "value": {"mitigation_remediation": ["Verify the libpng version currently installed.", "Upgrade libpng to version 1.6.56 or later to eliminate the vulnerable code.", "Rebuild or redeploy any applications that link against the updated libpng.", "If immediate upgrade is not possible, consider disabling NEON-optimized palette expansion or running the application on a platform without NEON support.", "Monitor logs for anomalous crashes or memory access violations that may indicate exploitation attempts."], "summary": {"action": "Patch immediately", "impact": "Memory corruption (out-of-bounds read/write)"}, "threat_synthesis": {"affected_systems": "The affected product is pnggroup\u2019s libpng reference library. Versions 1.6.36 through 1.6.55 on ARM AArch64 platforms with NEON enabled are vulnerable. Applications that use an affected libpng build\u2014such as image viewers, web servers, or other software that decodes PNG data\u2014are at risk. The issue is fixed in libpng 1.6.56 and later.", "description_and_impact": "The vulnerability lies in libpng\u2019s ARM/AArch64 NEON-optimized palette expansion routine. When converting 8-bit paletted rows to RGB or RGBA, the Neon loop processes a final partial chunk without checking that enough input pixels remain. Because the routine works backwards from the end of the row, the loop dereferences pointers before the start of the row buffer, causing an out-of-bounds read, and subsequently writes expanded pixel data to the same underflowed positions, leading to an out-of-bounds write. This memory corruption can allow an attacker to read sensitive data from the process address space or trigger a crash, depending on the context. The weakness is represented by CWE-124, CWE-125, and CWE-787.", "risk_and_exploitability": "The CVSS v3 score of 7.6 indicates high severity, while the EPSS score of under 1% suggests that exploitation is unlikely but still possible. The vulnerability is not listed in the CISA KEV catalog, implying no confirmed widespread exploitation. An attacker can trigger the flaw by feeding a crafted PNG file to any application that decodes images using the vulnerable libpng and has NEON enabled. Unlike many image-based bugs that only allow crashes, this out-of-bounds read/write can also provide access to process memory, potentially leading to information disclosure or further exploitation. However, the attack requires ARM AArch64 hardware and the NEON optimization path, which limits the attack surface to devices that meet these hardware and configuration conditions."}}}}, "created": "2026-03-27T08:33:42.075121+00:00", "updated": "2026-04-03T09:38:58.342359+00:00", "vendors": ["pnggroup", "pnggroup$PRODUCT$libpng"]}