Packages
- pyjwt - Python 3 implementation of JSON Web Token
Details
It was discovered that PyJWT incorrectly handled certain URIs when using
PyJWKClient. A remote attacker could possibly use this issue to perform
server-side request forgery (SSRF) or expose sensitive local files.
This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04 LTS and Ubuntu
26.04 LTS. (CVE-2026-48522)
It was discovered that PyJWT incorrectly verified cryptographic signatures
when decoding tokens with PyJWK keys. A remote attacker could possibly
use this issue to bypass signature verification and forge valid JSON Web
Tokens. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-48523)
It was discovered that PyJWT incorrectly handled unknown key identifiers
in PyJWKClient. A remote attacker could possibly use this issue to cause
PyJWT to make excessive network requests, resulting in a denial of service.
This issue only affected Ubuntu 24.04...
It was discovered that PyJWT incorrectly handled certain URIs when using
PyJWKClient. A remote attacker could possibly use this issue to perform
server-side request forgery (SSRF) or expose sensitive local files.
This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04 LTS and Ubuntu
26.04 LTS. (CVE-2026-48522)
It was discovered that PyJWT incorrectly verified cryptographic signatures
when decoding tokens with PyJWK keys. A remote attacker could possibly
use this issue to bypass signature verification and forge valid JSON Web
Tokens. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-48523)
It was discovered that PyJWT incorrectly handled unknown key identifiers
in PyJWKClient. A remote attacker could possibly use this issue to cause
PyJWT to make excessive network requests, resulting in a denial of service.
This issue only affected Ubuntu 24.04 LTS and Ubuntu 26.04 LTS.
(CVE-2026-48524)
It was discovered that PyJWT incorrectly handled payload decoding during
detached JWS token verification. A remote attacker could possibly use
this issue to cause PyJWT to consume excessive resources, resulting in
a denial of service. This issue only affected Ubuntu 24.04 LTS and
Ubuntu 26.04 LTS. (CVE-2026-48525)
It was discovered that PyJWT incorrectly validated JSON Web Keys when
decoding tokens with both HMAC and asymmetric algorithms enabled. A remote
attacker could possibly use this issue to forge valid tokens, resulting
in an authentication bypass. (CVE-2026-48526)
Update instructions
In general, a standard system update will make all the necessary changes.
Learn more about how to get the fixes.The problem can be corrected by updating your system to the following package versions:
| Ubuntu Release | Package Version | ||
|---|---|---|---|
| 26.04 LTS resolute | python3-jwt – 2.10.1-4ubuntu1.1 | ||
| 24.04 LTS noble | python3-jwt – 2.7.0-1ubuntu0.2 | ||
| 22.04 LTS jammy | python3-jwt – 2.3.0-1ubuntu0.4 | ||
| 20.04 LTS focal | python3-jwt – 1.7.1-2ubuntu2.1+esm2 | ||
| 18.04 LTS bionic | python-jwt – 1.5.3+ds1-1ubuntu0.1+esm2 | ||
| python3-jwt – 1.5.3+ds1-1ubuntu0.1+esm2 | |||
| 16.04 LTS xenial | python-jwt – 1.3.0-1ubuntu0.1+esm2 | ||
| python3-jwt – 1.3.0-1ubuntu0.1+esm2 | |||
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