PyJWT: ReDoS vulnerability when calling the `is_pem_format` function.
CVE-2026-102270 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-102270, released October 4, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| pyjwt · Debian 14 | 2.14.0-1 | DEBIAN-CVE-2026-102270 | Oct 4, 2026 |
| python-PyJWT · opensuse-leap 16.0 | 2.12.1-160000.3.1 | OPENSUSE-SU-2026:22074-1 | Nov 7, 2026 |
| python-PyJWT · sles 15.6 | 2.8.0-150400.8.20.1 | SUSE-SU-2026:5064-1 | Nov 7, 2026 |
| python-PyJWT · sles 15.7 | 2.8.0-150400.8.20.1 | SUSE-SU-2026:5064-1 | Nov 7, 2026 |
| python-PyJWT · sles 16.0 | 2.12.1-160000.3.1 | SUSE-SU-2026:24219-1 | Nov 7, 2026 |
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