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VulnerabilityPublished

CVE-2026-102268: jpadilla pyjwt · Improper Verification of Cryptographic Signature

Affects jpadilla pyjwtSource CVE Database V5

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Not known to be exploited · CVSS 9.1 Critical : upgrade to 2.14.0 as a priority.

Data as of 12 Nov 2026, 23:24 UTC

CVSS 3.1 base score
9.1Critical
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.2% chance of exploitation in 30 days – higher than 14% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 2.14.0
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 28 Sep 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: evidence found.

    Public exploit code: GitHub proofs of concept

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), GitHub proofs of concept, the Metasploit, Exploit-DB and nuclei-templates index as of 13 Nov 2026.

What to do

Upgrade jpadilla pyjwt to 2.14.0.

Affected software

ProductAffectedFixed in
jpadillapyjwtAffected
  • <2.14.0
Fixed in
  • 2.14.0
PyPIpyjwtpkg:pypi/pyjwtOther threatsAffected
  • <2.14.0
Fixed in
  • 2.14.0

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Upgrade PyJWT to version 2.14.0 or later, where this vulnerability is fixed. No other mitigation is required as the issue is resolved in the official release.

Description

PyJWT versions prior to 2.14.0 contain a vulnerability in the is_pem_format function that improperly verifies cryptographic signatures. This flaw allows an attacker who knows a public key to forge authenticated HMAC tokens by exploiting how the library misinterprets certain malformed PEM public keys as HMAC secrets. The issue is resolved in version 2.14.0.

References

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