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[CU-86b4umhm1] Update dependency pyjwt to v2.12.0 [SECURITY]#159

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[CU-86b4umhm1] Update dependency pyjwt to v2.12.0 [SECURITY]#159
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@dnastack-renovate dnastack-renovate bot commented Mar 14, 2026 •
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This PR contains the following updates:

Package Change Age Adoption Passing Confidence
pyjwt 2.10.1 → 2.12.0 age adoption passing confidence

GitHub Vulnerability Alerts

CVE-2026-32597

Summary

PyJWT does not validate the crit (Critical) Header Parameter defined in
RFC 7515 §4.1.11. When a JWS token contains a crit array listing
extensions that PyJWT does not understand, the library accepts the token
instead of rejecting it. This violates the MUST requirement in the RFC.

This is the same class of vulnerability as CVE-2025-59420 (Authlib),
which received CVSS 7.5 (HIGH).

RFC Requirement

RFC 7515 §4.1.11:

The "crit" (Critical) Header Parameter indicates that extensions to this
specification and/or [JWA] are being used that MUST be understood and
processed. [...] If any of the listed extension Header Parameters are
not understood and supported by the recipient, then the JWS is invalid.

Proof of Concept

import jwt  # PyJWT 2.8.0
import hmac, hashlib, base64, json

# Construct token with unknown critical extension
header = {"alg": "HS256", "crit": ["x-custom-policy"], "x-custom-policy": "require-mfa"}
payload = {"sub": "attacker", "role": "admin"}

def b64url(data):
    return base64.urlsafe_b64encode(data).rstrip(b"=").decode()

h = b64url(json.dumps(header, separators=(",", ":")).encode())
p = b64url(json.dumps(payload, separators=(",", ":")).encode())
sig = b64url(hmac.new(b"secret", f"{h}.{p}".encode(), hashlib.sha256).digest())
token = f"{h}.{p}.{sig}"

# Should REJECT — x-custom-policy is not understood by PyJWT
try:
    result = jwt.decode(token, "secret", algorithms=["HS256"])
    print(f"ACCEPTED: {result}")
    # Output: ACCEPTED: {'sub': 'attacker', 'role': 'admin'}
except Exception as e:
    print(f"REJECTED: {e}")

Expected: jwt.exceptions.InvalidTokenError: Unsupported critical extension: x-custom-policy
Actual: Token accepted, payload returned.

Comparison with RFC-compliant library

# jwcrypto — correctly rejects
from jwcrypto import jwt as jw_jwt, jwk
key = jwk.JWK(kty="oct", k=b64url(b"secret"))
jw_jwt.JWT(jwt=token, key=key, algs=["HS256"])

# raises: InvalidJWSObject('Unknown critical header: "x-custom-policy"')

Impact

  • Split-brain verification in mixed-library deployments (e.g., API
    gateway using jwcrypto rejects, backend using PyJWT accepts)
  • Security policy bypass when crit carries enforcement semantics
    (MFA, token binding, scope restrictions)
  • Token binding bypass — RFC 7800 cnf (Proof-of-Possession) can be
    silently ignored
  • See CVE-2025-59420 for full impact analysis

Suggested Fix

In jwt/api_jwt.py, add validation in _validate_headers() or
decode():

_SUPPORTED_CRIT = {"b64"}  # Add extensions PyJWT actually supports

def _validate_crit(self, headers: dict) -> None:
    crit = headers.get("crit")
    if crit is None:
        return
    if not isinstance(crit, list) or len(crit) == 0:
        raise InvalidTokenError("crit must be a non-empty array")
    for ext in crit:
        if ext not in self._SUPPORTED_CRIT:
            raise InvalidTokenError(f"Unsupported critical extension: {ext}")
        if ext not in headers:
            raise InvalidTokenError(f"Critical extension {ext} not in header")

CWE

  • CWE-345: Insufficient Verification of Data Authenticity
  • CWE-863: Incorrect Authorization

References

Release Notes

jpadilla/pyjwt (pyjwt)

v2.12.0

Compare Source

Fixed


- Add missing ``typing_extensions`` dependency for Python < 3.11 in `#&#8203;1150 <https://github.com/jpadilla/pyjwt/issues/1150>`__

`v2.12.0 <https://github.com/jpadilla/pyjwt/compare/2.11.0...2.12.0>`__
-----------------------------------------------------------------------

Fixed
  • Annotate PyJWKSet.keys for pyright by @​tamird in #&#8203;1134 <https://github.com/jpadilla/pyjwt/pull/1134>__
  • Close HTTPError response to prevent ResourceWarning on Python 3.14 by @​veeceey in #&#8203;1133 <https://github.com/jpadilla/pyjwt/pull/1133>__
  • Do not keep algorithms dict in PyJWK instances by @​akx in #&#8203;1143 <https://github.com/jpadilla/pyjwt/pull/1143>__
  • Validate the crit (Critical) Header Parameter defined in RFC 7515 §4.1.11. by @​dmbs335 in GHSA-752w-5fwx-jx9f <https://github.com/jpadilla/pyjwt/security/advisories/GHSA-752w-5fwx-jx9f>__
  • Use PyJWK algorithm when encoding without explicit algorithm in #&#8203;1148 <https://github.com/jpadilla/pyjwt/pull/1148>__

Added


- Docs: Add ``PyJWKClient`` API reference and document the two-tier caching system (JWK Set cache and signing key LRU cache).

`v2.11.0 <https://github.com/jpadilla/pyjwt/compare/2.10.1...2.11.0>`__
-----------------------------------------------------------------------

Fixed
  • Enforce ECDSA curve validation per RFC 7518 Section 3.4.
  • Fix build system warnings by @​kurtmckee in #&#8203;1105 <https://github.com/jpadilla/pyjwt/pull/1105>__
  • Validate key against allowed types for Algorithm family in #&#8203;964 <https://github.com/jpadilla/pyjwt/pull/964>__
  • Add iterator for JWKSet in #&#8203;1041 <https://github.com/jpadilla/pyjwt/pull/1041>__
  • Validate iss claim is a string during encoding and decoding by @​pachewise in #&#8203;1040 <https://github.com/jpadilla/pyjwt/pull/1040>__
  • Improve typing/logic for options in decode, decode_complete by @​pachewise in #&#8203;1045 <https://github.com/jpadilla/pyjwt/pull/1045>__
  • Declare float supported type for lifespan and timeout by @​nikitagashkov in #&#8203;1068 <https://github.com/jpadilla/pyjwt/pull/1068>__
  • Fix SyntaxWarning\s/DeprecationWarning\s caused by invalid escape sequences by @​kurtmckee in #&#8203;1103 <https://github.com/jpadilla/pyjwt/pull/1103>__
  • Development: Build a shared wheel once to speed up test suite setup times by @​kurtmckee in #&#8203;1114 <https://github.com/jpadilla/pyjwt/pull/1114>__
  • Development: Test type annotations across all supported Python versions,
    increase the strictness of the type checking, and remove the mypy pre-commit hook
    by @​kurtmckee in #&#8203;1112 <https://github.com/jpadilla/pyjwt/pull/1112>__

Added


- Support Python 3.14, and test against PyPy 3.10 and 3.11 by @&#8203;kurtmckee in `#&#8203;1104 <https://github.com/jpadilla/pyjwt/pull/1104>`__
- Development: Migrate to ``build`` to test package building in CI by @&#8203;kurtmckee in `#&#8203;1108 <https://github.com/jpadilla/pyjwt/pull/1108>`__
- Development: Improve coverage config and eliminate unused test suite code by @&#8203;kurtmckee in `#&#8203;1115 <https://github.com/jpadilla/pyjwt/pull/1115>`__
- Docs: Standardize CHANGELOG links to PRs by @&#8203;kurtmckee in `#&#8203;1110 <https://github.com/jpadilla/pyjwt/pull/1110>`__
- Docs: Fix Read the Docs builds by @&#8203;kurtmckee in `#&#8203;1111 <https://github.com/jpadilla/pyjwt/pull/1111>`__
- Docs: Add example of using leeway with nbf by @&#8203;djw8605 in `#&#8203;1034 <https://github.com/jpadilla/pyjwt/pull/1034>`__
- Docs: Refactored docs with ``autodoc``; added ``PyJWS`` and ``jwt.algorithms`` docs by @&#8203;pachewise in `#&#8203;1045 <https://github.com/jpadilla/pyjwt/pull/1045>`__
- Docs: Documentation improvements for "sub" and "jti" claims by @&#8203;cleder in `#&#8203;1088 <https://github.com/jpadilla/pyjwt/pull/1088>`__
- Development: Add pyupgrade as a pre-commit hook by @&#8203;kurtmckee in `#&#8203;1109 <https://github.com/jpadilla/pyjwt/pull/1109>`__
- Add minimum key length validation for HMAC and RSA keys (CWE-326).
  Warns by default via ``InsecureKeyLengthWarning`` when keys are below
  minimum recommended lengths per RFC 7518 Section 3.2 (HMAC) and
  NIST SP 800-131A (RSA). Pass ``enforce_minimum_key_length=True`` in
  options to ``PyJWT`` or ``PyJWS`` to raise ``InvalidKeyError`` instead.
- Refactor ``PyJWT`` to own an internal ``PyJWS`` instance instead of
  calling global ``api_jws`` functions.

`v2.10.1 <https://github.com/jpadilla/pyjwt/compare/2.10.0...2.10.1>`__
-----------------------------------------------------------------------

Fixed
  • Prevent partial matching of iss claim by @​fabianbadoi in GHSA-75c5-xw7c-p5pm <https://github.com/jpadilla/pyjwt/security/advisories/GHSA-75c5-xw7c-p5pm>__

v2.11.0

Compare Source

What's Changed
New Contributors

Full Changelog: jpadilla/pyjwt@2.10.1...2.11.0

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This PR has been generated by Renovate Bot.

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Task linked: CU-86b4umhm1 Setup Renovate server and introduce it to wallet

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github-actions bot commented Mar 14, 2026 •
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☂️ Python Coverage

current status: ✅

Overall Coverage

Lines Covered Coverage Threshold Status
10787 6063 56% 30% 🟢

New Files

No new covered files...

Modified Files

No covered modified files...

updated for commit: 8c27768 by action🐍

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