Is there a public exploit for CVE-2026-103001?

No public exploit for CVE-2026-103001 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-103001?

CVE-2026-103001 scores CVSS 6.5 (v3.1), rated medium. EPSS puts the chance of exploitation in the next 30 days at 0.26%.

What does CVE-2026-103001 affect?

CVE-2026-103001 affects jpadilla PyJWT.

6.5 Medium

PyJWT is a Python implementation of JSON Web Token standards.

CVE-2026-103001

Summary PyJWT.decode()/decodecomplete() mutates a caller-supplied options dict in place whenever verifysignature is falsy, adding verifyexp/verifynbf/verifyiat/verifyaud/verifyiss/verifysub/verifyjti keys directly onto that object. If application code reuses the same options dict across calls (a config object, a module-level constant, a wrapper's self.options), a later call that explicitly sets verifysignature=True for a full, normal verification silently inherits the leftover verifyexp=False etc. from an earlier verifysignature=False call on the same object -- and accepts an expired, wrong-audience, wrong-issuer, or wrong-subject token as valid with no exception. Signature verification itself is unaffected; this is specifically a claims-check bypass. This is a regression of an already-fixed, closed issue: originally reported in #679 (2021), fixed in #743 (2022, via a shallow copy of options), and silently reintroduced by #1045 (merged 2025-03-05, a typing/logic refactor that dropped the 2022 shallow-copy line). It has been present since #1045 merged, so it likely shipped in several releases already in the wild. Details File: jwt/apijwt.py, PyJWT.mergeoptions() (called from…

Assessment

CVSS: 6.5 (v3.1)
Severity: Medium
EPSS: 0.26% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 30 September 2026
Last updated: 8 October 2026
Affected: jpadilla · pyjwt · PyJWT
Weakness: CWE-471
Assigner: security-advisories@github.com

CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N

At the source

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