{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-103001", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-09-29T20:46:08.335Z", "datePublished": "2026-09-30T21:15:12.862Z", "dateUpdated": "2026-09-30T21:17:58.116Z"}, "containers": {"cna": {"title": "PyJWT.decode() reintroduces options-dict mutation, enabling silent claim-verification bypass on dict reuse", "problemTypes": [{"descriptions": [{"cweId": "CWE-471", "lang": "en", "description": "CWE-471: Modification of Assumed-Immutable Data (MAID)", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/jpadilla/pyjwt/security/advisories/GHSA-gvp8-978c-rx2q", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/jpadilla/pyjwt/security/advisories/GHSA-gvp8-978c-rx2q"}, {"name": "https://github.com/jpadilla/pyjwt/issues/679", "tags": ["x_refsource_MISC"], "url": "https://github.com/jpadilla/pyjwt/issues/679"}, {"name": "https://github.com/jpadilla/pyjwt/commit/0c87c8c8b1a74cac99ad8115f3050efcb7fbed35", "tags": ["x_refsource_MISC"], "url": "https://github.com/jpadilla/pyjwt/commit/0c87c8c8b1a74cac99ad8115f3050efcb7fbed35"}], "affected": [{"vendor": "jpadilla", "product": "pyjwt", "versions": [{"version": ">= 2.11.0, <= 2.13.0", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-09-30T21:17:58.116Z"}, "descriptions": [{"lang": "en", "value": "PyJWT is a Python implementation of JSON Web Token standards. From 2.11.0 through 2.13.0, PyJWT's PyJWT._merge_options() method can modify a caller-supplied mutable options mapping when verify_signature is false. If an application reuses that same mapping for a later decode() or decode_complete() call and changes verify_signature to true, the mapping can retain false values for expiration, not-before, issued-at, audience, issuer, subject, and JWT ID checks. A signed token with invalid registered claims can then be accepted without disabling signature verification, but applications that create a fresh options mapping for each call are not affected."}], "source": {"advisory": "GHSA-gvp8-978c-rx2q", "discovery": "UNKNOWN"}}}}

{}

{"affected": [{"affectedData": [{"product": "pyjwt", "vendor": "jpadilla", "versions": [{"status": "affected", "version": ">= 2.11.0, <= 2.13.0"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "PyJWT is a Python implementation of JSON Web Token standards. From 2.11.0 through 2.13.0, PyJWT's PyJWT._merge_options() method can modify a caller-supplied mutable options mapping when verify_signature is false. If an application reuses that same mapping for a later decode() or decode_complete() call and changes verify_signature to true, the mapping can retain false values for expiration, not-before, issued-at, audience, issuer, subject, and JWT ID checks. A signed token with invalid registered claims can then be accepted without disabling signature verification, but applications that create a fresh options mapping for each call are not affected."}], "id": "CVE-2026-103001", "lastModified": "2026-10-01T02:17:43.350", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 4.2, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-09-30T22:16:33.537", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/jpadilla/pyjwt/commit/0c87c8c8b1a74cac99ad8115f3050efcb7fbed35"}, {"source": "security-advisories@github.com", "url": "https://github.com/jpadilla/pyjwt/issues/679"}, {"source": "security-advisories@github.com", "url": "https://github.com/jpadilla/pyjwt/security/advisories/GHSA-gvp8-978c-rx2q"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-471"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{"bugzilla": {"description": "pyjwt: pyjwt: Token validation bypass via options dictionary mutation", "id": "2544369", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2544369"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N", "status": "draft"}, "cwe": "CWE-358", "details": ["A flaw was found in pyjwt. This vulnerability allows a remote attacker to bypass token validation checks when an application reuses an options configuration across multiple token decoding requests. Because the library unintentionally modifies the caller's shared configuration dictionary when signature verification is disabled, subsequent token verifications may retain disabled claim checks. As a result, an attacker could supply an expired or otherwise invalid JSON Web Token (JWT) that the application accepts as valid."], "name": "CVE-2026-103001", "package_state": [{"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "package_name": "jaeger", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "package_name": "llvm21", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "package_name": "rust", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "package_name": "swift-lang", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-09-30T21:15:12Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-103001\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-103001\nhttps://github.com/jpadilla/pyjwt/commit/0c87c8c8b1a74cac99ad8115f3050efcb7fbed35\nhttps://github.com/jpadilla/pyjwt/issues/679\nhttps://github.com/jpadilla/pyjwt/security/advisories/GHSA-gvp8-978c-rx2q"], "threat_severity": "Moderate"}

{"created": "2026-09-30T23:00:17.808546+00:00", "updated": "2026-10-01T02:00:15.514337+00:00", "vendors": [], "weaknesses": ["CWE-358", "CWE-471"]}