Vulnerabilities for PyJWT

First version without a known vulnerability: 2.15.0

Details

• GHSA-x33g-cr3x-64492026-10-05

  PyJWT accepts inconsistent OKP x/d JWKs, causing public/private key identity confusion

  Fixed in: 2.15.0

• GHSA-gvp8-978c-rx2q2026-09-30

  PyJWT.decode() reintroduces options-dict mutation, enabling silent claim-verification bypass on dict reuse

• GHSA-42vr-xj54-vc7v2026-09-30

  PyJWT: Unauthenticated RecursionError DoS in pre-verification payload parse (PyJWKClient.get_signing_key_from_jwt / verify_signature=False)

  Fixed in: 2.15.0

• GHSA-jwrc-g2q2-pq5p2026-09-30

  PyJWT: ReDoS vulnerability when calling the `is_pem_format` function.

  Fixed in: 2.14.0

• GHSA-9j54-fg26-wv3r2026-09-29

  PyJWT: PyJWK accepts empty HMAC keys, bypassing PyJWT's empty-key validation

  Fixed in: 2.14.0

• GHSA-8wjv-2p76-38632026-09-29

  PyJWT: Uncaught RecursionError in jwt.decode() on deeply nested token header

  Fixed in: 2.14.0

• GHSA-hxm8-2xgr-2p9m2026-09-29

  PyJWT: Non-canonical signature segments enable raw-token revocation bypass

  Fixed in: 2.14.0

• GHSA-ffc3-869f-jxw92026-09-29

  PyJWT: Asymmetric-PEM detection bypass: whitespace/line-ending-mutated public keys skip the HS/asymmetric confusion guard

  Fixed in: 2.14.0

• GHSA-w2cx-738m-mc7w2026-09-29

  PyJWT accepts public JWK containers as HMAC secrets

  Fixed in: 2.14.0

• GHSA-9v7f-9g4p-ffgj2026-09-29

  PyJWT: PyJWKClient follows redirects when fetching JWKS

  Fixed in: 2.14.0

• GHSA-p4g4-x82p-q7732026-09-29

  PyJWT: Public keys in DER form are accepted as HMAC secrets, bypassing the CVE-2022-29217 guard

  Fixed in: 2.14.0

• GHSA-r6x4-923q-g9472026-09-29

  PyJWT BOM Bypass

  Fixed in: 2.14.0

• GHSA-2gx3-rcp4-g85q2026-09-29

  PyJWT: PyJWKClient still amplifies unauthenticated JWKS fetches on unknown kid values (incomplete fix of CVE-2026-48524)

  Fixed in: 2.14.0

• GHSA-w6j9-cwv2-h6wq2026-09-29

  PyJWT: Malformed RSA JWK aborts parsing of an entire JWK Set

  Fixed in: 2.14.0

• GHSA-w7vc-732c-9m392026-06-15

  PyJWT: Unauthenticated DoS via unbounded Base64URL decoding of unused payload segment in b64=false detached JWS

  Fixed in: 2.13.0

• GHSA-993g-76c3-p5m42026-06-15

  PyJWKClient: missing scheme allowlist enables CVE-2024-21643-class SSRF + token forgery via file://, ftp://, data: schemes

  Fixed in: 2.13.0

• GHSA-xgmm-8j9v-c9wx2026-06-15

  PyJWT: Public-key JWK accepted as HMAC secret enables forged HS256 tokens when mixed families are allowed

  Fixed in: 2.13.0

• GHSA-jq35-7prp-9v3f2026-06-15

  PyJWT: Algorithm allow-list bypass when decoding with `PyJWK` / `PyJWKClient` keys

  Fixed in: 2.13.0, 2.12.1

• GHSA-fhv5-28vv-h8m82026-06-15

  PyJWKClient unbounded JWKS endpoint requests via attacker-controlled kid values (DoS)

  Fixed in: 2.13.0

• GHSA-752w-5fwx-jx9f2026-03-13

  PyJWT accepts unknown `crit` header extensions

  Fixed in: 2.12.0

• PYSEC-2025-1832025-07-31

  pyjwt v2.10.1 was discovered to contain weak encryption. NOTE: this is disputed by the Supplier because the key length is chosen by the application that uses the library (admittedly, library users may benefit from a minimum value and a mechanism for opting in to strict enforcement).

• GHSA-75c5-xw7c-p5pm2024-12-02

  PyJWT Issuer field partial matches allowed

  Fixed in: 2.10.1

• GHSA-ffqj-6fqr-9h242022-05-24

  Key confusion through non-blocklisted public key formats

  Fixed in: 2.4.0, 9c528670c455b8d948aff95ed50e22940d1ad3fc

• GHSA-r9jw-mwhq-wp622022-05-13

  PyJWT vulnerable to key confusion attacks

  Fixed in: 1.5.1