CVE-2026-57077

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{"affected": [{"affectedData": [{"collectionURL": "https://cpan.org/modules", "defaultStatus": "unaffected", "packageName": "YAML-Syck", "product": "YAML::Syck", "programFiles": ["token.c"], "programRoutines": [{"name": "newline_len"}, {"name": "is_newline"}], "repo": "https://github.com/toddr/YAML-Syck", "vendor": "TODDR", "versions": [{"lessThan": "1.47", "status": "affected", "version": "0", "versionType": "custom"}]}], "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "YAML::Syck versions before 1.47 for Perl allow an out-of-bounds read via an unbounded newline scan in newline_len.\n\nIn the bundled libsyck newline_len and is_newline dereference the scan pointer, and the following byte for a \"\\r\\n\" pair, with no NUL-terminator or bounds check. During block-scalar lexing at a document boundary the scan runs one byte past the heap lexer buffer. This is an incomplete fix of CVE-2025-11683, on a lexer path the earlier fix did not cover.\n\nAny caller that runs Load or LoadFile on an untrusted document with a block scalar at a document boundary reaches the over-read."}, {"lang": "es", "value": "Las versiones de YAML::Syck anteriores a la 1.47 para Perl permiten una lectura fuera de l\u00edmites a trav\u00e9s de un escaneo de nueva l\u00ednea sin l\u00edmites en newline_len.\n\nEn la libsyck incluida, newline_len e is_newline desreferencian el puntero de escaneo, y el byte siguiente para un par \u201c\\r\\n\u201d, sin terminador NUL ni comprobaci\u00f3n de l\u00edmites. Durante el an\u00e1lisis l\u00e9xico de escalar de bloque en un l\u00edmite de documento, el escaneo se ejecuta un byte m\u00e1s all\u00e1 del b\u00fafer del analizador l\u00e9xico del heap. Esta es una correcci\u00f3n incompleta de CVE-2025-11683, en una ruta del analizador l\u00e9xico que la correcci\u00f3n anterior no cubri\u00f3.\n\nCualquier llamador que ejecute Load o LoadFile en un documento no confiable con un escalar de bloque en un l\u00edmite de documento alcanza la sobrelectura."}], "id": "CVE-2026-57077", "lastModified": "2026-10-24T20:10:00.137", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.7, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.5, "impactScore": 5.2, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-57077", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-07-17T13:05:26.689858Z", "version": "2.0.3"}}]}, "published": "2026-07-16T22:17:43.650", "references": [{"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "url": "https://github.com/toddr/YAML-Syck/commit/44c90a109ec3215ee7ce747bd11209835e123d8b.patch"}, {"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "url": "https://metacpan.org/release/TODDR/YAML-Syck-1.47/changes"}, {"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "url": "https://www.cve.org/CVERecord?id=CVE-2025-11683"}], "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "type": "Secondary"}]}

{"bugzilla": {"description": "YAML::Syck: YAML::Syck: Information disclosure via out-of-bounds read", "id": "2501576", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2501576"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N", "status": "draft"}, "cwe": "CWE-125", "details": ["YAML::Syck versions before 1.47 for Perl allow an out-of-bounds read via an unbounded newline scan in newline_len.\nIn the bundled libsyck newline_len and is_newline dereference the scan pointer, and the following byte for a \"\\r\\n\" pair, with no NUL-terminator or bounds check. During block-scalar lexing at a document boundary the scan runs one byte past the heap lexer buffer. This is an incomplete fix of CVE-2025-11683, on a lexer path the earlier fix did not cover.\nAny caller that runs Load or LoadFile on an untrusted document with a block scalar at a document boundary reaches the over-read.", "A flaw was found in YAML::Syck. An out-of-bounds read vulnerability exists due to an unbounded newline scan during block-scalar lexing. A remote attacker could exploit this by providing a specially crafted YAML document, leading to potential information disclosure. This issue is an incomplete fix for a previously identified vulnerability."], "mitigation": {"lang": "en:us", "value": "To mitigate this vulnerability, restrict applications using `perl-YAML-Syck` from processing untrusted YAML documents. Ensure that only trusted input sources are parsed by `YAML::Syck`. If `perl-YAML-Syck` is not required, consider removing the package to eliminate the exposure, noting that this may affect dependent applications."}, "name": "CVE-2026-57077", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "perl-YAML-Syck", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "perl-YAML-Syck", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "perl-YAML-Syck", "product_name": "Red Hat Enterprise Linux 8"}], "public_date": "2026-07-16T21:41:52Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-57077\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-57077\nhttps://github.com/toddr/YAML-Syck/commit/44c90a109ec3215ee7ce747bd11209835e123d8b.patch\nhttps://metacpan.org/release/TODDR/YAML-Syck-1.47/changes\nhttps://www.cve.org/CVERecord?id=CVE-2025-11683"], "statement": "Moderate: An out-of-bounds read flaw in `perl-YAML-Syck` can lead to information disclosure when processing specially crafted YAML documents. This vulnerability, an incomplete fix for CVE-2025-11683, occurs during block-scalar lexing if an application loads untrusted YAML input containing a block scalar at a document boundary.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,1.47)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "YAML::Syck", "source": "cna", "vendor": "TODDR"}, "product": "yaml::syck", "vendor": "toddr"}], "created": "2026-07-16T23:30:07.187655+00:00", "updated": "2026-07-31T01:15:18.446426+00:00", "vendors": ["toddr", "toddr$PRODUCT$yaml::syck"]}