{"api_version":"1","generated_at":"2026-08-11T11:30:33+00:00","cve":"CVE-2026-19429","urls":{"html":"https://cve.report/CVE-2026-19429","api":"https://cve.report/api/cve/CVE-2026-19429.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-19429","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-19429"},"summary":{"title":"Jenkins - FilePath.untarFrom() Symlink Target Validation Bypass and Blank-Name Check Bypass (Arbitrary File Read)","description":"Jenkins FilePath.untarFrom() does not validate symlink targets in extracted TAR archives, even in versions patched for CVE-2026-33001 and CVE-2026-70427. An authenticated attacker with job configuration privileges can include a malicious archive in a build step that creates workspace symlinks pointing to arbitrary files on the Jenkins controller. By reading the secrets directory, the attacker obtains the cryptographic keys used to sign remember-me cookies, forges a valid administrator session cookie without any admin interaction, and gains access to the Script Console for remote code execution. Jenkins 2.576 is additionally affected by a bypass of the CVE-2026-70427 blank-name check via Unicode zero-width characters (U+200B, U+200C, U+200D, U+2060, U+00AD), which Java's String.isBlank() does not recognize as whitespace.","state":"PUBLISHED","assigner":"TuranSec","published_at":"2026-08-10 13:17:58","updated_at":"2026-08-11 08:17:20"},"problem_types":["CWE-59","CWE-184","CWE-59 CWE-59: Improper Link Resolution Before File Access ('Link Following')","CWE-184 CWE-184: Incomplete List of Disallowed 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Jenkins 2.576 is additionally affected by a bypass of the CVE-2026-70427 blank-name check via Unicode zero-width characters (U+200B, U+200C, U+200D, U+2060, U+00AD), which Java's String.isBlank() does not recognize as whitespace."}],"metrics":[{"cvssV3_1":{"baseScore":8.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]},{"cvssV4_0":{"baseScore":9.4,"baseSeverity":"CRITICAL","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","version":"4.0"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-59","description":"CWE-59: Improper Link Resolution Before File Access ('Link Following')","lang":"en","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-184","description":"CWE-184: Incomplete List of Disallowed Inputs","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-08-11T07:23:15.794Z","orgId":"309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c","shortName":"TuranSec"},"references":[{"name":"Jenkins Security Advisory 2026-03-18 (CVE-2026-33001 — incomplete fix)","tags":["related"],"url":"https://www.jenkins.io/security/advisory/2026-03-18/#SECURITY-3657"},{"name":"Jenkins Security Advisory 2026-08-05 (CVE-2026-70427)","tags":["related"],"url":"https://www.jenkins.io/security/advisory/2026-08-05/"},{"name":"Jenkins Source Repository","tags":["third-party-advisory"],"url":"https://github.com/jenkinsci/jenkins"}],"source":{"discovery":"EXTERNAL"},"timeline":[{"lang":"en","time":"2026-04-04T00:00:00.000Z","value":"Vulnerability discovered via patch-diff analysis of CVE-2026-33001 fix"},{"lang":"en","time":"2026-08-05T00:00:00.000Z","value":"Re-verified against Jenkins 2.557 and LTS 2.555.3 — still unpatched"},{"lang":"en","time":"2026-08-10T12:00:00.000Z","value":"Public disclosure (90-day window exceeded)"},{"lang":"en","time":"2026-08-11T00:00:00.000Z","value":"Additional variant confirmed: CVE-2026-70427 blank-name patch bypass via Unicode zero-width characters (U+200B/U+200C/U+200D/U+2060/U+00AD) on Jenkins 2.576"},{"lang":"en","time":"2026-08-11T08:00:00.000Z","value":"Full impact confirmed: secrets directory read enables remember-me cookie forgery and unauthenticated admin RCE with zero admin interaction"}],"title":"Jenkins - 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An authenticated attacker with job configuration privileges can include a malicious archive in a build step that creates workspace symlinks pointing to arbitrary files on the Jenkins controller. By reading the secrets directory, the attacker obtains the cryptographic keys used to sign remember-me cookies, forges a valid administrator session cookie without any admin interaction, and gains access to the Script Console for remote code execution. Jenkins 2.576 is additionally affected by a bypass of the CVE-2026-70427 blank-name check via Unicode zero-width characters (U+200B, U+200C, U+200D, U+2060, U+00AD), which Java's String.isBlank() does not recognize as whitespace.","Type":"Description","Title":"Jenkins - FilePath.untarFrom() Symlink Target Validation Bypass "}]}}}