{"id":"USN-8133-1","summary":"pyjwt vulnerability","details":"It was discovered that PyJWT did not validate the critical header\nparameter, contrary to the RFC specification expectations. A remote\nattacker could possibly use this issue to bypass certain authentication\nchecks and restrictions.","modified":"2026-03-31T18:16:27.209607Z","published":"2026-03-30T15:02:33Z","related":["UBUNTU-CVE-2026-32597"],"upstream":["CVE-2026-32597","UBUNTU-CVE-2026-32597"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8133-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-32597"}],"affected":[{"package":{"name":"pyjwt","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/pyjwt@1.3.0-1ubuntu0.1+esm1?arch=source&distro=esm-infra/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.3.0-1ubuntu0.1+esm1"}]}],"versions":["1.0.0-0ubuntu1","1.3.0-1","1.3.0-1ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.3.0-1ubuntu0.1+esm1","binary_name":"python-jwt"},{"binary_version":"1.3.0-1ubuntu0.1+esm1","binary_name":"python3-jwt"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8133-1.json","cves_map":{"cves":[{"id":"CVE-2026-32597","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:Pro:16.04:LTS"}}},{"package":{"name":"pyjwt","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/pyjwt@1.5.3+ds1-1ubuntu0.1+esm1?arch=source&distro=esm-infra/bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.5.3+ds1-1ubuntu0.1+esm1"}]}],"versions":["1.4.2-1.1","1.5.3+ds1-1","1.5.3+ds1-1ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.5.3+ds1-1ubuntu0.1+esm1","binary_name":"python-jwt"},{"binary_version":"1.5.3+ds1-1ubuntu0.1+esm1","binary_name":"python3-jwt"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8133-1.json","cves_map":{"cves":[{"id":"CVE-2026-32597","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:Pro:18.04:LTS"}}},{"package":{"name":"pyjwt","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/pyjwt@1.7.1-2ubuntu2.1+esm1?arch=source&distro=esm-infra/focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.7.1-2ubuntu2.1+esm1"}]}],"versions":["1.7.0-2","1.7.1-1","1.7.1-2ubuntu1","1.7.1-2ubuntu2","1.7.1-2ubuntu2.1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.7.1-2ubuntu2.1+esm1","binary_name":"python3-jwt"}],"availability":"Available with Ubuntu Pro (Infra-only): 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required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8133-1.json","cves_map":{"cves":[{"id":"CVE-2026-32597","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:24.04:LTS"}}},{"package":{"name":"pyjwt","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/pyjwt@2.10.1-2ubuntu0.1?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.10.1-2ubuntu0.1"}]}],"versions":["2.10.1-2"],"ecosystem_specific":{"binaries":[{"binary_version":"2.10.1-2ubuntu0.1","binary_name":"python3-jwt"}],"availability":"No subscription 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