aad-fastapi (>=1.0.0, <=1.1.2), aad-fastapi-dl37 (>=1.0.0, <=1.0.3) +225 more potentially affected by CVE-2025-59420 via authlib (>=0.10.0, <=1.6.3)

authlib PYPI version =0.10.0, =1.0.0, =1.0.0, =0.0.1, =1.0.2, =1.0.2, =0.4.0rc1, =0.1.0, =1.3.0a20250904, =1.2.0a20250730, =1.2.0a20250730, =0.0.0, =1.2.0, =0.0.1, =0.1.0, =0.2.1 and more Source cves: CVE-2025-59420 Source advisory: MEND:CVE-2025-59420...

CVE-2025-59420 Authlib: JWS/JWT accepts unknown crit headers (RFC violation → possible authz bypass)

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.4, Authlib’s JWS verification accepts tokens that declare unknown critical header parameters crit, violating RFC 7515 “must‑understand” semantics. An attacker can craft a signed token with a critical...

CVE-2025-59420

Authlib (Python) prior to 1.6.4 verifies JWS tokens with unknown critical header parameters (crit), violating RFC 7515 must-understand semantics. An attacker could craft a signed token that strict verifiers reject but Authlib accepts, enabling policy bypass, replay, or privilege escalation in mix...

CVE-2025-59420 Authlib: JWS/JWT accepts unknown crit headers (RFC violation → possible authz bypass)

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.4, Authlib’s JWS verification accepts tokens that declare unknown critical header parameters crit, violating RFC 7515 “must‑understand” semantics. An attacker can craft a signed token with a critical...

CVE-2025-59420 Authlib: JWS/JWT accepts unknown crit headers (RFC violation → possible authz bypass)

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.4, Authlib’s JWS verification accepts tokens that declare unknown critical header parameters crit, violating RFC 7515 “must‑understand” semantics. An attacker can craft a signed token with a critical...

GHSA-9GGR-2464-2J32 Authlib: JWS/JWT accepts unknown crit headers (RFC violation → possible authz bypass)

Summary Authlib’s JWS verification accepts tokens that declare unknown critical header parameters crit, violating RFC 7515 “must‑understand” semantics. An attacker can craft a signed token with a critical header for example, bork or cnf that strict verifiers reject but Authlib accepts. In...

meltano (>=1.60.0, <=2.1.0), molten-jwt (0.2.1) potentially affected by CVE-2025-59420 via authlib (0.10.0)

authlib PYPI version 0.10.0 is affected by a known vulnerability. The following packages have a transitive dependency on authlib and may be impacted: - meltano =1.60.0, =2.1.0 - molten-jwt 0.2.1 Source cves: CVE-2025-59420 Source advisory: OSV:GHSA-9GGR-2464-2J32...

authutils (>=6.1.2, <=6.2.2), dash-google-oauth (>=1.0.0, <=1.2.0) +1 more potentially affected by CVE-2025-59420 via authlib (0.11.0)

authlib PYPI version 0.11.0 is affected by a known vulnerability. The following packages have a transitive dependency on authlib and may be impacted: - authutils =6.1.2, =1.0.0, =0.1.2, =0.2.0.dev5 Source cves: CVE-2025-59420 Source advisory: OSV:GHSA-9GGR-2464-2J32...

molten-jwt (0.3.0) potentially affected by CVE-2025-59420 via authlib (0.12.1)

authlib PYPI version 0.12.1 is affected by a known vulnerability. The following packages have a transitive dependency on authlib and may be impacted: - molten-jwt 0.3.0 Source cves: CVE-2025-59420 Source advisory: OSV:GHSA-9GGR-2464-2J32...

lumapps-sdk (>=1.0.0b13, <=1.0.0b18) potentially affected by CVE-2025-59420 via authlib (0.14.1)

authlib PYPI version 0.14.1 is affected by a known vulnerability. The following packages have a transitive dependency on authlib and may be impacted: - lumapps-sdk =1.0.0b13, =1.0.0b18 Source cves: CVE-2025-59420 Source advisory: OSV:GHSA-9GGR-2464-2J32...

authutils (5.0.3) potentially affected by CVE-2025-59420 via authlib (0.14.2)

authlib PYPI version 0.14.2 is affected by a known vulnerability. The following packages have a transitive dependency on authlib and may be impacted: - authutils 5.0.3 Source cves: CVE-2025-59420 Source advisory: OSV:GHSA-9GGR-2464-2J32...

authlib-gino (>=0.1.0, <=0.3.0), cnmcclient (0.4.3) +14 more potentially affected by CVE-2025-59420 via authlib (0.14.3)

authlib PYPI version 0.14.3 is affected by a known vulnerability. The following packages have a transitive dependency on authlib and may be impacted: - authlib-gino =0.1.0, =0.1.2, =0.4.0, =0.1.2, =1.0.0b7, =0.2.0, =1.0.0, =7.0.8.dev28841, =3.5.6.dev19088, =5.1.1.dev24106 and more Source cves:...

bastion-key-client (>=1.0.1, <=1.4.0), fabric-am-handlers (>=0.11.0, <=1.4.0b2) +5 more potentially affected by CVE-2025-59420 via authlib (0.15.2)

authlib PYPI version 0.15.2 is affected by a known vulnerability. The following packages have a transitive dependency on authlib and may be impacted: - bastion-key-client =1.0.1, =0.11.0, =0.14.0, =0.4.0, =0.9.0, =1.0.0b1, =1.0.0 Source cves: CVE-2025-59420 Source advisory: OSV:GHSA-9GGR-2464-2J3...

cumulusci (>=3.32.0, <=3.37.0.dev0), lumapps-sdk (>=1.1.3b5, <=2.0.3) +3 more potentially affected by CVE-2025-59420 via authlib (0.15.3)

authlib PYPI version 0.15.3 is affected by a known vulnerability. The following packages have a transitive dependency on authlib and may be impacted: - cumulusci =3.32.0, =1.1.3b5, =0.1.0, =0.53.1, =0.1.0, =0.1.9 Source cves: CVE-2025-59420 Source advisory: OSV:GHSA-9GGR-2464-2J32...

aad-fastapi (>=1.0.0, <=1.1.2), aad-fastapi-dl37 (1.0.3) +11 more potentially affected by CVE-2025-59420 via authlib (0.15.4)

authlib PYPI version 0.15.4 is affected by a known vulnerability. The following packages have a transitive dependency on authlib and may be impacted: - aad-fastapi =1.0.0, =0.0.1, =1.0.2, =1.0.2, =0.1.9, =3.37.0, =1.0.0, =2.6.0.dev1, =0.1.1, =0.4.0, =14.0.3, =14.8.2 Source cves: CVE-2025-59420...

annotell-auth (>=1.2.0, <=1.6.1), apicrud (>=0.0.59, <=0.3.6) +36 more potentially affected by CVE-2025-59420 via authlib (0.15.6)

authlib PYPI version 0.15.6 is affected by a known vulnerability. The following packages have a transitive dependency on authlib and may be impacted: - annotell-auth =1.2.0, =0.0.59, =0.5.0, =5.0.0b1, =0.1.0, =2.1.4, =0.1.1, =0.1.1, =0.1.0, =0.3.10, =0.1.0, =0.0.1, =0.7.2, =0.9.4 and more Source...

aad-fastapi-dl37 (>=1.0.0, <=1.0.2), agentstack-cli (>=0.4.0rc1, <=0.4.3) +159 more potentially affected by CVE-2025-59420 via authlib (>=1.0.0b2, <=1.6.3)

authlib PYPI version =1.0.0b2, =1.0.0, =0.4.0rc1, =0.1.0, =1.3.0a20250904, =1.2.0a20250730, =1.2.0a20250730, =0.0.0, =1.7.0, =0.0.1, =0.1.0, =1.0.3, =2.0.0, =0.16.0, =0.33.0, =0.41.0 and more Source cves: CVE-2025-59420 Source advisory: OSV:GHSA-9GGR-2464-2J32...

aad-fastapi-dl37 (>=1.0.0, <=1.0.2), agentstack-cli (>=0.4.0rc1, <=0.4.3) +159 more potentially affected by CVE-2025-59420 via authlib (>=1.0.0b2, <=1.6.3)

authlib PYPI version =1.0.0b2, =1.0.0, =0.4.0rc1, =0.1.0, =1.3.0a20250904, =1.2.0a20250730, =1.2.0a20250730, =0.0.0, =1.7.0, =0.0.1, =0.1.0, =1.0.3, =2.0.0, =0.16.0, =0.33.0, =0.41.0 and more Source cves: CVE-2025-59420 Source advisory: SNYK:PYTHON-AUTHLIB-13003878...

aad-fastapi-dl37 (>=1.0.0, <=1.0.2), agentstack-cli (>=0.4.0rc1, <=0.4.3) +159 more potentially affected by CVE-2025-59420 via authlib (>=1.0.0b2, <=1.6.3)

authlib PYPI version =1.0.0b2, =1.0.0, =0.4.0rc1, =0.1.0, =1.3.0a20250904, =1.2.0a20250730, =1.2.0a20250730, =0.0.0, =1.7.0, =0.0.1, =0.1.0, =1.0.3, =2.0.0, =0.16.0, =0.33.0, =0.41.0 and more Source cves: CVE-2025-59420 Source advisory: GHSA-9GGR-2464-2J32...

Authlib: JWS/JWT accepts unknown crit headers (RFC violation → possible authz bypass)

Summary Authlib’s JWS verification accepts tokens that declare unknown critical header parameters crit, violating RFC 7515 “must‑understand” semantics. An attacker can craft a signed token with a critical header for example, bork or cnf that strict verifiers reject but Authlib accepts. In...