GHSA-r6x4-923q-g947: pyjwt (CVE-2026-102272)

Package	Ecosystem	Affected	Fixed in
pyjwt	PyPI	>=2.13.0, <2.14.0	2.14.0

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

PyJWT versions 2.13.0 up to but not including 2.14.0 are vulnerable to an algorithm confusion bypass in the raw JWK check for HMAC keys, which lets an attacker forge HS256 tokens when the application accepts both asymmetric and HMAC algorithms and passes a raw public RSA JWK as the key. An attacker needs the application's public RSA key, which is usually available, and could then forge tokens with arbitrary claims. Upgrade to PyJWT 2.14.0.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
7.4	High	3.1	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0022, the 12th percentile, on 7 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 14:09 UTC First seen by agentprime
31 Oct 2026, 14:09 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.