CVE-2026-102270Medium· 4.4▾ TwilightPoC availablePyJWT is a Python implementation of JSON Web Token standards. Prior to 2.14.0, PyJWT is_pem_format is affected because lazy PEM regular expression backtracks extensively. This occurs when a certificate-like input contains repeated BEGIN …
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 24.2 · likelihood 0 · exploitation 12
A public proof-of-concept already exists for this vulnerability — see Exploit availability below.
Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Sep 29.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.2%
Exploit / PoC code exists
Last analysed / modified upstream
0.2% → 0.2%
PyJWT is a Python implementation of JSON Web Token standards. Prior to 2.14.0, PyJWT is_pem_format is affected because lazy PEM regular expression backtracks extensively. This occurs when a certificate-like input contains repeated BEGIN markers without a matching END marker. As a result, is_pem_format performs unbounded backtracking while searching for a PEM end marker. Consequently, an attacker can cause intensive CPU consumption. This issue is fixed in version 2.14.0.
pyjwt < 2.14.0Upgrade past the affected range:
pyjwt 2.14.0Affected packages:
pyjwt <= 2.13.0Patched in:
pyjwt 2.14.0Source: https://github.com/advisories/GHSA-jwrc-g2q2-pq5p
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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