YuSung Han discovered that PyJWT did not properly validate certain JWK keys when performing HMAC verification. An attacker could possibly use this issue to forge authentication tokens. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-102266) Rohan Das discovered that PyJWT incorrectly handled redirects when fetching key sets. A remote attacker could possibly use this issue to cause PyJWT to disclose sensitive information. This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, Ubuntu 26.04 LTS. (CVE-2026-102267) It was discovered that PyJWT incorrectly recognized certain PEM representations. An attacker who knew the public key could possibly use this issue to forge authentication tokens. This issue only affected Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, Ubuntu 26.04 LTS. (CVE-2026-102268) Nuno Lopes discovered that PyJWT incorrectly handled DER public keys when performing HMAC verification. An attacker who knew the public key could possibly use this issue to forge authentication tokens. (CVE-2026-102271) It was discovered that PyJWT did not properly handle certain JWK keys prefixed with a byte-order mark. An attacker who knew the public key could possibly use this issue to forge authentication tokens. (CVE-2026-102272) Charles Vosburgh discovered that PyJWT incorrectly handled certain JWK containers when performing HMAC verification. An attacker who knew the public key could possibly use this issue to forge authentication tokens. (CVE-2026-102273) Update Instructions: Run `sudo pro fix USN-8916-1` to fix the vulnerability. The problem can be corrected by updating your system to the following package versions: python3-jwt - 2.10.1-4ubuntu1.2 No subscription required
Last supporting evidence check: 2026-10-23T01:56:19.341Z UTC
python3-jwt 2.10.1-4ubuntu1.2-2.10.1-4ubuntu1.2
python3-jwt 2.3.0-1ubuntu0.5-2.3.0-1ubuntu0.5
python3-jwt 2.7.0-1ubuntu0.3-2.7.0-1ubuntu0.3
python3-jwt 1.7.1-2ubuntu2.1+esm3-1.7.1-2ubuntu2.1+esm3