CVE Explorer
CVE-2026-48523
PyJWT is a JSON Web Token implementation in Python. From 2.9.0 to 2.12.1, there is a verifier-side algorithm allow-list bypass when jwt.decode() or jwt.decode_complete() are called with a PyJWK key. The token header alg is checked against the caller-supplied algorithms allow-list, but signature verification is performed with the algorithm bound to the PyJWK object instead of the header algorithm. An attacker who controls a registered JWK/JWKS private key can sign with a disallowed algorithm, adv
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"product":"pyjwt","vendor":"jpadilla","versions":[{"status":"affected","version":">= 2.9.0, < 2.13.0"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:9f4cf550fac6ce2c4a077df71d8be57170a01aae1f3a4d35abac2f7dc056e973 · sha256:434d2cd3dbc7da68… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.4,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:9f4cf550fac6ce2c4a077df71d8be57170a01aae1f3a4d35abac2f7dc056e973 · sha256:434d2cd3dbc7da68… · /containers/cna/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-347","description":"CWE-347: Improper Verification of Cryptographic Signature","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:9f4cf550fac6ce2c4a077df71d8be57170a01aae1f3a4d35abac2f7dc056e973 · sha256:434d2cd3dbc7da68… · /containers/cna/problemTypes/0/descriptions/0
Source references
2 source assertions{"name":"https://github.com/jpadilla/pyjwt/security/advisories/GHSA-jq35-7prp-9v3f","tags":["x_refsource_CONFIRM"],"url":"https://github.com/jpadilla/pyjwt/security/advisories/GHSA-jq35-7prp-9v3f"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:9f4cf550fac6ce2c4a077df71d8be57170a01aae1f3a4d35abac2f7dc056e973 · sha256:434d2cd3dbc7da68… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://github.com/jpadilla/pyjwt/security/advisories/GHSA-jq35-7prp-9v3f"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:9f4cf550fac6ce2c4a077df71d8be57170a01aae1f3a4d35abac2f7dc056e973 · sha256:434d2cd3dbc7da68… · /containers/adp/0/references/0
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.