{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-40930", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-04-15T20:40:15.518Z", "datePublished": "2026-06-04T14:34:51.843Z", "dateUpdated": "2026-06-04T15:05:19.991Z"}, "containers": {"cna": {"title": "LIBPNG: Chunk smuggling in push-mode APNG parser via unconsumed chunk body", "problemTypes": [{"descriptions": [{"cweId": "CWE-436", "lang": "en", "description": "CWE-436: Interpretation Conflict", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 5.4, "baseSeverity": "MEDIUM", "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:L", "version": "3.1"}}], "references": [{"name": "https://github.com/pnggroup/libpng/security/advisories/GHSA-c4v6-gxrq-6g2x", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/pnggroup/libpng/security/advisories/GHSA-c4v6-gxrq-6g2x"}, {"name": "https://github.com/pnggroup/libpng/commit/faf06924688b62d7c1654b5ceddedbde66ffadb4", "tags": ["x_refsource_MISC"], "url": "https://github.com/pnggroup/libpng/commit/faf06924688b62d7c1654b5ceddedbde66ffadb4"}], "affected": [{"vendor": "pnggroup", "product": "libpng", "versions": [{"version": "= 1.8.0", "status": "affected"}]}, {"vendor": "pnggroup", "product": "libpng-apng", "versions": [{"version": ">= 1.6.49, <= 1.6.57", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-06-04T14:34:51.843Z"}, "descriptions": [{"lang": "en", "value": "LIBPNG is a reference library for use in applications that process PNG (Portable Network Graphics) raster image files. In version 1.8.0, three inter-frame chunk discard paths in the push-mode APNG parser clear the chunk-header flag without consuming the chunk body and CRC, allowing attacker-controlled bytes inside an ignored ancillary chunk to be reinterpreted as a fresh chunk header on the next call to `png_process_data`. Commit faf06924688b62d7c1654b5ceddedbde66ffadb4 fixes the issue."}], "source": {"advisory": "GHSA-c4v6-gxrq-6g2x", "discovery": "UNKNOWN"}}, "adp": [{"title": "CVE Program Container", "references": [{"url": "http://www.openwall.com/lists/oss-security/2026/05/15/21"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2026-06-04T15:05:19.991Z"}}]}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "LIBPNG is a reference library for use in applications that process PNG (Portable Network Graphics) raster image files. In version 1.8.0, three inter-frame chunk discard paths in the push-mode APNG parser clear the chunk-header flag without consuming the chunk body and CRC, allowing attacker-controlled bytes inside an ignored ancillary chunk to be reinterpreted as a fresh chunk header on the next call to `png_process_data`. Commit faf06924688b62d7c1654b5ceddedbde66ffadb4 fixes the issue."}], "id": "CVE-2026-40930", "lastModified": "2026-06-04T16:23:52.530", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 5.4, "baseSeverity": "MEDIUM", "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:L", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 2.5, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-06-04T16:16:36.633", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/pnggroup/libpng/commit/faf06924688b62d7c1654b5ceddedbde66ffadb4"}, {"source": "security-advisories@github.com", "url": "https://github.com/pnggroup/libpng/security/advisories/GHSA-c4v6-gxrq-6g2x"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.openwall.com/lists/oss-security/2026/05/15/21"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Undergoing Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-436"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{"created": "2026-06-04T16:30:06.452960+00:00", "updated": "2026-06-04T16:30:06.452971+00:00", "vendors": []}