{"items":[{"id":"NVI-00013207","kind":"vulnerability","title":"PyJWT: Non-canonical signature segments enable raw-token revocation bypass","revision":3,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected.","NVD lastModified does not establish freshness of every associated CPE record."],"lifecycle":"active","identifiers":["GHSA-hxm8-2xgr-2p9m","CVE-2026-102269"],"plain_summary":"GitHub lists this reviewed advisory for PyJWT. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-03c934d42b95d4e74478621ba64bb6f2"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-09-29T23:17:56.000Z","value":"4.8 medium","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-917beeced0c84db7496460275dea2cbe"},{"kind":"CVSS","as_of":"2026-10-06T18:54:08.460Z","value":"4.8 MEDIUM (3.1)","meaning":"security-advisories@github.com severity; no combined Null risk score.","source_id":"sr-52308b0228bfd0e158b1799d77ddb9e1"},{"kind":"CVSS","as_of":"2026-10-06T18:54:08.460Z","value":"5.4 MEDIUM (3.1)","meaning":"nvd@nist.gov severity; no combined Null risk score.","source_id":"sr-52308b0228bfd0e158b1799d77ddb9e1"},{"kind":"EPSS","as_of":"2026-11-05T12:03:04.000Z","value":"0.224%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.1308. Missing scores are unknown.","source_id":"sr-03c934d42b95d4e74478621ba64bb6f2"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-917beeced0c84db7496460275dea2cbe","url":"https://github.com/advisories/GHSA-hxm8-2xgr-2p9m","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-hxm8-2xgr-2p9m","publisher":"GitHub Advisory Database","observed_at":"2026-11-01T07:24:25.558Z"},{"id":"sr-52308b0228bfd0e158b1799d77ddb9e1","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-102269","basis":"official_catalog","notes":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","title":"CVE-2026-102269","publisher":"NIST National Vulnerability Database","observed_at":"2026-11-03T09:58:04.487Z"},{"id":"sr-03c934d42b95d4e74478621ba64bb6f2","url":"https://www.first.org/epss/data.html","basis":"official_catalog","notes":"FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.","title":"CVE-2026-102269","publisher":"FIRST EPSS","observed_at":"2026-11-06T00:24:57.623Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-917beeced0c84db7496460275dea2cbe"],"technology":"PyJWT","known_exclusions":[],"conditions_summary":"## Summary\n\nPyJWT 2.13.0 accepts compact JWS signature segments containing characters that\nare not in the Base64URL alphabet. Appending `!!!!` to a valid signature does\nnot change the decoded signature bytes or authenticated claims, but it changes\nthe serialized token and its SHA-256 hash. An application that indexes logout\nor revocation state by the raw token therefore rejects the logged-out token and\naccepts its no-key alternate serialization.\n\nThis report separates two issues: permissive compact-JWS decoding is the\nlibrary behavior, while using raw serialized JWT text as a security identity is\na dangerous application composition. A `jti`-indexed control blocks both\nrepresentations.\n\n## Affected Version\n\nConfirmed with PyJWT 2.13.0 on CPython 3.13. The mutation changes only the\nsignature segment and requires no signing key.\n\n## End-to-End Reproduction\n\n```bash\n.venv-research/bin/python 06-practical-testing/revocation-bypass-lab.py\n```\n\nThe loopback-only lab performs:\n\n1. Issue a valid HS256 admin token.\n2. Access `/protected` successfully.\n3. Log out the canonical token and store `SHA256(raw_token)`.\n4. Confirm canonical replay returns HTTP 401.\n5. Append `!!!!` to only the signa","public_affected_ranges":["<= 2.13.0"]}],"null_published_at":"2026-11-07T07:07:42.545Z","source_updated_at":"2026-09-29T23:17:56.000Z","source_disclosed_at":"2026-09-29T23:17:55.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.","null_first_observed_at":"2026-11-01T07:24:25.558Z"},{"id":"NVI-00013207","kind":"vulnerability","title":"PyJWT: Non-canonical signature segments enable raw-token revocation bypass","revision":2,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected.","NVD lastModified does not establish freshness of every associated CPE record."],"lifecycle":"active","identifiers":["GHSA-hxm8-2xgr-2p9m","CVE-2026-102269"],"plain_summary":"GitHub lists this reviewed advisory for PyJWT. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-52308b0228bfd0e158b1799d77ddb9e1"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-09-29T23:17:56.000Z","value":"4.8 medium","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-917beeced0c84db7496460275dea2cbe"},{"kind":"CVSS","as_of":"2026-10-06T18:54:08.460Z","value":"4.8 MEDIUM (3.1)","meaning":"security-advisories@github.com severity; no combined Null risk score.","source_id":"sr-52308b0228bfd0e158b1799d77ddb9e1"},{"kind":"CVSS","as_of":"2026-10-06T18:54:08.460Z","value":"5.4 MEDIUM (3.1)","meaning":"nvd@nist.gov severity; no combined Null risk score.","source_id":"sr-52308b0228bfd0e158b1799d77ddb9e1"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-917beeced0c84db7496460275dea2cbe","url":"https://github.com/advisories/GHSA-hxm8-2xgr-2p9m","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-hxm8-2xgr-2p9m","publisher":"GitHub Advisory Database","observed_at":"2026-11-01T07:24:25.558Z"},{"id":"sr-52308b0228bfd0e158b1799d77ddb9e1","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-102269","basis":"official_catalog","notes":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","title":"CVE-2026-102269","publisher":"NIST National Vulnerability Database","observed_at":"2026-11-03T09:58:04.487Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-917beeced0c84db7496460275dea2cbe"],"technology":"PyJWT","known_exclusions":[],"conditions_summary":"## Summary\n\nPyJWT 2.13.0 accepts compact JWS signature segments containing characters that\nare not in the Base64URL alphabet. Appending `!!!!` to a valid signature does\nnot change the decoded signature bytes or authenticated claims, but it changes\nthe serialized token and its SHA-256 hash. An application that indexes logout\nor revocation state by the raw token therefore rejects the logged-out token and\naccepts its no-key alternate serialization.\n\nThis report separates two issues: permissive compact-JWS decoding is the\nlibrary behavior, while using raw serialized JWT text as a security identity is\na dangerous application composition. A `jti`-indexed control blocks both\nrepresentations.\n\n## Affected Version\n\nConfirmed with PyJWT 2.13.0 on CPython 3.13. The mutation changes only the\nsignature segment and requires no signing key.\n\n## End-to-End Reproduction\n\n```bash\n.venv-research/bin/python 06-practical-testing/revocation-bypass-lab.py\n```\n\nThe loopback-only lab performs:\n\n1. Issue a valid HS256 admin token.\n2. Access `/protected` successfully.\n3. Log out the canonical token and store `SHA256(raw_token)`.\n4. Confirm canonical replay returns HTTP 401.\n5. Append `!!!!` to only the signa","public_affected_ranges":["<= 2.13.0"]}],"null_published_at":"2026-11-05T19:10:23.267Z","source_updated_at":"2026-09-29T23:17:56.000Z","source_disclosed_at":"2026-09-29T23:17:55.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Source facts changed; compare the preserved prior revision.","null_first_observed_at":"2026-11-01T07:24:25.558Z"},{"id":"NVI-00013207","kind":"vulnerability","title":"PyJWT: Non-canonical signature segments enable raw-token revocation bypass","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-hxm8-2xgr-2p9m","CVE-2026-102269"],"plain_summary":"GitHub lists this reviewed advisory for PyJWT. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-917beeced0c84db7496460275dea2cbe"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-09-29T23:17:56.000Z","value":"4.8 medium","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-917beeced0c84db7496460275dea2cbe"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-917beeced0c84db7496460275dea2cbe","url":"https://github.com/advisories/GHSA-hxm8-2xgr-2p9m","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-hxm8-2xgr-2p9m","publisher":"GitHub Advisory Database","observed_at":"2026-11-01T07:24:25.558Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-917beeced0c84db7496460275dea2cbe"],"technology":"PyJWT","known_exclusions":[],"conditions_summary":"## Summary\n\nPyJWT 2.13.0 accepts compact JWS signature segments containing characters that\nare not in the Base64URL alphabet. Appending `!!!!` to a valid signature does\nnot change the decoded signature bytes or authenticated claims, but it changes\nthe serialized token and its SHA-256 hash. An application that indexes logout\nor revocation state by the raw token therefore rejects the logged-out token and\naccepts its no-key alternate serialization.\n\nThis report separates two issues: permissive compact-JWS decoding is the\nlibrary behavior, while using raw serialized JWT text as a security identity is\na dangerous application composition. A `jti`-indexed control blocks both\nrepresentations.\n\n## Affected Version\n\nConfirmed with PyJWT 2.13.0 on CPython 3.13. The mutation changes only the\nsignature segment and requires no signing key.\n\n## End-to-End Reproduction\n\n```bash\n.venv-research/bin/python 06-practical-testing/revocation-bypass-lab.py\n```\n\nThe loopback-only lab performs:\n\n1. Issue a valid HS256 admin token.\n2. Access `/protected` successfully.\n3. Log out the canonical token and store `SHA256(raw_token)`.\n4. Confirm canonical replay returns HTTP 401.\n5. Append `!!!!` to only the signa","public_affected_ranges":["<= 2.13.0"]}],"null_published_at":"2026-11-01T07:29:12.929Z","source_updated_at":"2026-09-29T23:17:56.000Z","source_disclosed_at":"2026-09-29T23:17:55.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-11-01T07:24:25.558Z"}],"next_cursor":null,"snapshot_revision":"42594"}