CVE-2026-32597

Publication date 13 March 2026

Last updated 30 March 2026

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

7.5 · High

Score breakdown

Description

PyJWT is a JSON Web Token implementation in Python. Prior to 2.12.0, PyJWT does not validate the crit (Critical) Header Parameter defined in RFC 7515 ยง4.1.11. When a JWS token contains a crit array listing extensions that PyJWT does not understand, the library accepts the token instead of rejecting it. This violates the MUST requirement in the RFC. This vulnerability is fixed in 2.12.0.

Status

Package Ubuntu Release Status
pyjwt 25.10 questing
Fixed 2.10.1-2ubuntu0.1
24.04 LTS noble
Fixed 2.7.0-1ubuntu0.1
22.04 LTS jammy
Fixed 2.3.0-1ubuntu0.3
20.04 LTS focal
Fixed 1.7.1-2ubuntu2.1+esm1
18.04 LTS bionic
Fixed 1.5.3+ds1-1ubuntu0.1+esm1
16.04 LTS xenial
Fixed 1.3.0-1ubuntu0.1+esm1

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Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
pyjwt

Severity score breakdown

Parameter Value
Base score 7.5 · High
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact High
Availability impact None
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

References

Related Ubuntu Security Notices (USN)

Other references

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