{"id":"USN-8823-1","summary":"pyjwt vulnerabilities","details":"It was discovered that PyJWT incorrectly handled certain URIs when using\nPyJWKClient. A remote attacker could possibly use this issue to perform\nserver-side request forgery (SSRF) or expose sensitive local files.\nThis issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04 LTS and Ubuntu\n26.04 LTS. (CVE-2026-48522)\n\nIt was discovered that PyJWT incorrectly verified cryptographic signatures\nwhen decoding tokens with PyJWK keys. A remote attacker could possibly\nuse this issue to bypass signature verification and forge valid JSON Web\nTokens. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-48523)\n\nIt was discovered that PyJWT incorrectly handled unknown key identifiers\nin PyJWKClient. A remote attacker could possibly use this issue to cause\nPyJWT to make excessive network requests, resulting in a denial of service.\nThis issue only affected Ubuntu 24.04 LTS and Ubuntu 26.04 LTS.\n(CVE-2026-48524)\n\nIt was discovered that PyJWT incorrectly handled payload decoding during\ndetached JWS token verification. A remote attacker could possibly use\nthis issue to cause PyJWT to consume excessive resources, resulting in\na denial of service. This issue only affected Ubuntu 24.04 LTS and\nUbuntu 26.04 LTS. (CVE-2026-48525)\n\nIt was discovered that PyJWT incorrectly validated JSON Web Keys when\ndecoding tokens with both HMAC and asymmetric algorithms enabled. A remote\nattacker could possibly use this issue to forge valid tokens, resulting\nin an authentication bypass. (CVE-2026-48526)","modified":"2026-09-28T11:42:18.098644977Z","published":"2026-09-25T07:49:33Z","related":["UBUNTU-CVE-2026-48522","UBUNTU-CVE-2026-48523","UBUNTU-CVE-2026-48524","UBUNTU-CVE-2026-48525","UBUNTU-CVE-2026-48526"],"upstream":["CVE-2026-48522","CVE-2026-48523","CVE-2026-48524","CVE-2026-48525","CVE-2026-48526","UBUNTU-CVE-2026-48522","UBUNTU-CVE-2026-48523","UBUNTU-CVE-2026-48524","UBUNTU-CVE-2026-48525","UBUNTU-CVE-2026-48526"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8823-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-48522"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-48523"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-48524"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-48525"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-48526"}],"affected":[{"package":{"name":"pyjwt","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/pyjwt?arch=source&distro=esm-infra-legacy%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.3.0-1ubuntu0.1+esm2"}]}],"versions":["1.0.0-0ubuntu1","1.3.0-1","1.3.0-1ubuntu0.1","1.3.0-1ubuntu0.1+esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.3.0-1ubuntu0.1+esm2","binary_name":"python-jwt"},{"binary_version":"1.3.0-1ubuntu0.1+esm2","binary_name":"python3-jwt"}],"availability":"Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8823-1.json","cves_map":{"cves":[{"id":"CVE-2026-48526","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"},{"score":"medium","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:Pro:16.04:LTS"}}},{"package":{"name":"pyjwt","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/pyjwt?arch=source&distro=esm-infra%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.5.3+ds1-1ubuntu0.1+esm2"}]}],"versions":["1.4.2-1.1","1.5.3+ds1-1","1.5.3+ds1-1ubuntu0.1","1.5.3+ds1-1ubuntu0.1+esm1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_name":"python-jwt","binary_version":"1.5.3+ds1-1ubuntu0.1+esm2"},{"binary_version":"1.5.3+ds1-1ubuntu0.1+esm2","binary_name":"python3-jwt"}]},"database_specific":{"cves_map":{"cves":[{"id":"CVE-2026-48526","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"},{"score":"medium","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:Pro:18.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8823-1.json"}},{"package":{"name":"pyjwt","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/pyjwt?arch=source&distro=esm-infra%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.7.1-2ubuntu2.1+esm2"}]}],"versions":["1.7.0-2","1.7.1-1","1.7.1-2ubuntu1","1.7.1-2ubuntu2","1.7.1-2ubuntu2.1","1.7.1-2ubuntu2.1+esm1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_name":"python3-jwt","binary_version":"1.7.1-2ubuntu2.1+esm2"}]},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:20.04:LTS","cves":[{"id":"CVE-2026-48526","severity":[{"score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","type":"CVSS_V3"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"},{"score":"medium","type":"Ubuntu"}]}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8823-1.json"}},{"package":{"name":"pyjwt","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/pyjwt?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.3.0-1ubuntu0.4"}]}],"versions":["1.7.1-2ubuntu2","2.1.0-1","2.3.0-1","2.3.0-1ubuntu0.1","2.3.0-1ubuntu0.2","2.3.0-1ubuntu0.3"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"python3-jwt","binary_version":"2.3.0-1ubuntu0.4"}]},"database_specific":{"cves_map":{"cves":[{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-48522"},{"id":"CVE-2026-48526","severity":[{"score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","type":"CVSS_V3"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"},{"score":"medium","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:22.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8823-1.json"}},{"package":{"name":"pyjwt","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/pyjwt?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.7.0-1ubuntu0.2"}]}],"versions":["2.7.0-1","2.7.0-1ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_name":"python3-jwt","binary_version":"2.7.0-1ubuntu0.2"}],"availability":"No subscription required"},"database_specific":{"cves_map":{"cves":[{"id":"CVE-2026-48522","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2026-48524","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"type":"Ubuntu","score":"medium"}]},{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-48525"},{"id":"CVE-2026-48526","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"},{"score":"medium","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:24.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8823-1.json"}},{"package":{"name":"pyjwt","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/pyjwt?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.10.1-4ubuntu1.1"}]}],"versions":["2.10.1-2","2.10.1-3","2.10.1-3build1","2.10.1-4","2.10.1-4ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_name":"python3-jwt","binary_version":"2.10.1-4ubuntu1.1"}],"availability":"No 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