CVE-2026-8796

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-8796", "assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "state": "PUBLISHED", "assignerShortName": "CPANSec", "dateReserved": "2026-05-18T00:38:16.965Z", "datePublished": "2026-05-31T19:43:22.054Z", "dateUpdated": "2026-06-01T18:42:31.783Z"}, "containers": {"cna": {"affected": [{"collectionURL": "https://cpan.org/modules", "defaultStatus": "unaffected", "packageName": "Sereal-Decoder", "product": "Sereal::Decoder", "programFiles": ["Perl/Decoder/srl_decoder.c"], "programRoutines": [{"name": "srl_read_object()"}, {"name": "srl_read_hash()"}], "repo": "https://github.com/Sereal/Sereal", "vendor": "YVES", "versions": [{"lessThan": "5.005", "status": "affected", "version": "0", "versionType": "custom"}]}], "descriptions": [{"lang": "en", "value": "Sereal::Decoder versions before 5.005 for Perl allow heap out-of-bounds read via crafted input.\n\nIn Perl/Decoder/srl_decoder.c, srl_read_object() and srl_read_hash() process a COPY tag, a back-reference whose target byte the decoder re-decodes as a fresh tag. When that target byte matches the SHORT_BINARY pattern (an inline string whose length is encoded in the low bits of the tag), the resulting read is not bounded to precede the COPY tag's own offset and can run past the end of the input buffer. An attacker controlled COPY offset can land inside a previously decoded value rather than on a tag boundary, planting a byte that the decoder reads as a SHORT_BINARY tag and consuming up to 31 following bytes from the heap as a class name (OBJECT path) or hash key (HASH path)."}], "problemTypes": [{"descriptions": [{"cweId": "CWE-125", "description": "CWE-125 Out-of-bounds Read", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "shortName": "CPANSec", "dateUpdated": "2026-05-31T19:43:22.054Z"}, "references": [{"tags": ["patch"], "url": "https://github.com/Sereal/Sereal/commit/303a2c69cdba80bf37a3ff43461e0aa78198a7a3.patch"}, {"tags": ["release-notes"], "url": "https://metacpan.org/release/YVES/Sereal-Decoder-5.005/changes"}], "solutions": [{"lang": "en", "value": "Upgrade to Sereal::Decoder 5.005 or later."}], "source": {"discovery": "UNKNOWN"}, "timeline": [{"lang": "en", "time": "2026-05-13T00:00:00.000Z", "value": "Issue reported."}, {"lang": "en", "time": "2026-05-19T00:00:00.000Z", "value": "Fix released in Sereal::Decoder 5.005."}, {"lang": "en", "time": "2026-05-20T00:00:00.000Z", "value": "Fix verified against proofs of concept."}], "title": "Sereal::Decoder versions before 5.005 for Perl allow heap out-of-bounds read via crafted input", "x_generator": {"engine": "cpansec-cna-tool 0.1"}}, "adp": [{"title": "CVE Program Container", "references": [{"url": "http://www.openwall.com/lists/oss-security/2026/06/01/1"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2026-06-01T07:44:02.734Z"}}, {"metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.1, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-06-01T18:42:19.702527Z", "id": "CVE-2026-8796", "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": "2026-06-01T18:42:31.783Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"cna": {"title": "Sereal::Decoder versions before 5.005 for Perl allow heap out-of-bounds read via crafted input", "source": {"discovery": "UNKNOWN"}, "affected": [{"repo": "https://github.com/Sereal/Sereal", "vendor": "YVES", "product": "Sereal::Decoder", "versions": [{"status": "affected", "version": "0", "lessThan": "5.005", "versionType": "custom"}], "packageName": "Sereal-Decoder", "programFiles": ["Perl/Decoder/srl_decoder.c"], "collectionURL": "https://cpan.org/modules", "defaultStatus": "unaffected", "programRoutines": [{"name": "srl_read_object()"}, {"name": "srl_read_hash()"}]}], "timeline": [{"lang": "en", "time": "2026-05-13T00:00:00.000Z", "value": "Issue reported."}, {"lang": "en", "time": "2026-05-19T00:00:00.000Z", "value": "Fix released in Sereal::Decoder 5.005."}, {"lang": "en", "time": "2026-05-20T00:00:00.000Z", "value": "Fix verified against proofs of concept."}], "solutions": [{"lang": "en", "value": "Upgrade to Sereal::Decoder 5.005 or later."}], "references": [{"url": "https://github.com/Sereal/Sereal/commit/303a2c69cdba80bf37a3ff43461e0aa78198a7a3.patch", "tags": ["patch"]}, {"url": "https://metacpan.org/release/YVES/Sereal-Decoder-5.005/changes", "tags": ["release-notes"]}], "x_generator": {"engine": "cpansec-cna-tool 0.1"}, "descriptions": [{"lang": "en", "value": "Sereal::Decoder versions before 5.005 for Perl allow heap out-of-bounds read via crafted input.\n\nIn Perl/Decoder/srl_decoder.c, srl_read_object() and srl_read_hash() process a COPY tag, a back-reference whose target byte the decoder re-decodes as a fresh tag. When that target byte matches the SHORT_BINARY pattern (an inline string whose length is encoded in the low bits of the tag), the resulting read is not bounded to precede the COPY tag's own offset and can run past the end of the input buffer. An attacker controlled COPY offset can land inside a previously decoded value rather than on a tag boundary, planting a byte that the decoder reads as a SHORT_BINARY tag and consuming up to 31 following bytes from the heap as a class name (OBJECT path) or hash key (HASH path)."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-125", "description": "CWE-125 Out-of-bounds Read"}]}], "providerMetadata": {"orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "shortName": "CPANSec", "dateUpdated": "2026-05-31T19:43:22.054Z"}}, "adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.1, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2026-8796", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-06-01T18:42:19.702527Z"}}}], "providerMetadata": {"shortName": "CISA-ADP", "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "dateUpdated": "2026-06-01T18:42:04.759Z"}}]}, "cveMetadata": {"cveId": "CVE-2026-8796", "state": "PUBLISHED", "dateUpdated": "2026-05-31T19:43:22.054Z", "dateReserved": "2026-05-18T00:38:16.965Z", "assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "datePublished": "2026-05-31T19:43:22.054Z", "assignerShortName": "CPANSec"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"collectionURL": "https://cpan.org/modules", "defaultStatus": "unaffected", "packageName": "Sereal-Decoder", "product": "Sereal::Decoder", "programFiles": ["Perl/Decoder/srl_decoder.c"], "programRoutines": [{"name": "srl_read_object()"}, {"name": "srl_read_hash()"}], "repo": "https://github.com/Sereal/Sereal", "vendor": "YVES", "versions": [{"lessThan": "5.005", "status": "affected", "version": "0", "versionType": "custom"}]}], "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Sereal::Decoder versions before 5.005 for Perl allow heap out-of-bounds read via crafted input.\n\nIn Perl/Decoder/srl_decoder.c, srl_read_object() and srl_read_hash() process a COPY tag, a back-reference whose target byte the decoder re-decodes as a fresh tag. When that target byte matches the SHORT_BINARY pattern (an inline string whose length is encoded in the low bits of the tag), the resulting read is not bounded to precede the COPY tag's own offset and can run past the end of the input buffer. An attacker controlled COPY offset can land inside a previously decoded value rather than on a tag boundary, planting a byte that the decoder reads as a SHORT_BINARY tag and consuming up to 31 following bytes from the heap as a class name (OBJECT path) or hash key (HASH path)."}, {"lang": "es", "value": "Las versiones de Sereal::Decoder anteriores a la 5.005 para Perl permiten una lectura fuera de l\u00edmites de la memoria din\u00e1mica a trav\u00e9s de una entrada especialmente dise\u00f1ada.\n\nEn Perl/Decoder/srl_decoder.c, srl_read_object() y srl_read_hash() procesan una etiqueta COPY, una retro-referencia cuyo byte objetivo el decodificador vuelve a decodificar como una nueva etiqueta. Cuando ese byte objetivo coincide con el patr\u00f3n SHORT_BINARY (una cadena en l\u00ednea cuya longitud est\u00e1 codificada en los bits bajos de la etiqueta), la lectura resultante no est\u00e1 limitada a preceder el propio desplazamiento de la etiqueta COPY y puede exceder el final del b\u00fafer de entrada. Un desplazamiento COPY controlado por el atacante puede caer dentro de un valor previamente decodificado en lugar de en un l\u00edmite de etiqueta, plantando un byte que el decodificador lee como una etiqueta SHORT_BINARY y consumiendo hasta 31 bytes siguientes de la memoria din\u00e1mica como un nombre de clase (ruta OBJECT) o una clave hash (ruta HASH)."}], "id": "CVE-2026-8796", "lastModified": "2026-07-22T07:10:00.107", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.2, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-8796", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-06-01T18:42:19.702527Z", "version": "2.0.3"}}]}, "published": "2026-05-31T20:16:30.813", "references": [{"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "url": "https://github.com/Sereal/Sereal/commit/303a2c69cdba80bf37a3ff43461e0aa78198a7a3.patch"}, {"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "url": "https://metacpan.org/release/YVES/Sereal-Decoder-5.005/changes"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.openwall.com/lists/oss-security/2026/06/01/1"}], "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,5.005)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Sereal::Decoder", "source": "cna", "vendor": "YVES"}, "product": "sereal::decoder", "vendor": "yves"}], "created": "2026-05-31T21:30:05.854185+00:00", "updated": "2026-06-01T21:00:15.843613+00:00", "vendors": ["yves", "yves$PRODUCT$sereal::decoder"]}