{"items":[{"id":"NVI-00014987","kind":"vulnerability","title":"PyJWKClient unbounded JWKS endpoint requests via attacker-controlled kid values (DoS)","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-fhv5-28vv-h8m8","CVE-2026-48524"],"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-2a80fcf523916a0528871a0b414e232d"],"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":"2026-07-31T22:13:03.000Z","value":"3.7 low","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-01403dcba54311a154708b77faede94b"},{"kind":"CVSS","as_of":"2026-10-26T13:10:00.140Z","value":"3.7 LOW (3.1)","meaning":"security-advisories@github.com severity; no combined Null risk score.","source_id":"sr-2a80fcf523916a0528871a0b414e232d"}],"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-01403dcba54311a154708b77faede94b","url":"https://github.com/advisories/GHSA-fhv5-28vv-h8m8","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-fhv5-28vv-h8m8","publisher":"GitHub Advisory Database","observed_at":"2026-11-03T09:58:33.950Z"},{"id":"sr-2a80fcf523916a0528871a0b414e232d","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-48524","basis":"official_catalog","notes":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","title":"CVE-2026-48524","publisher":"NIST National Vulnerability Database","observed_at":"2026-11-08T01:47:43.921Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-01403dcba54311a154708b77faede94b"],"technology":"pyjwt","known_exclusions":[],"conditions_summary":"> [!NOTE]\n>  The vulnerability surfaces only when a JWKS fetch fails; an attacker can attempt to provoke that with sustained unknown-kid traffic, but the outcome depends on upstream JWKS-endpoint behavior (rate limiting, transient errors) which is beyond the attacker's control. Impact is reduced auth availability until the next successful fetch, not complete denial of service.\n\n## Summary\nPyJWKClient.get_signing_key() forces a fresh HTTP request to the JWKS endpoint for every JWT with an unknown kid value, with no rate limiting. Since kid comes from the unverified token header, an attacker can trigger unlimited outbound requests.\n\nAdditionally, fetch_data() finally block clears the JWKS cache on network error.\n\n## Root Cause\njwt/jwks_client.py:172-198 - get_signing_key(kid) calls get_signing_keys(refresh=True) for unknown kids, bypassing TTL cache with no cooldown.\njwt/jwks_client.py:120-122 - finally block writes None to cache on error, clearing valid data.\n\n## Impact\n- DoS against JWKS endpoint (unlimited requests per invalid token)\n- DoS against application (network I/O latency)\n- Cascading failure (rate limiting clears cache, breaking legitimate auth)\n\n## Suggested Fix\n1. Add r","public_affected_ranges":[">= 2.0.0, <= 2.12.1"]}],"null_published_at":"2026-11-08T19:53:44.043Z","source_updated_at":"2026-07-31T22:13:03.000Z","source_disclosed_at":"2026-06-15T17:28:46.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Source facts changed; compare the preserved prior revision.","null_first_observed_at":"2026-11-03T09:58:33.950Z"},{"id":"NVI-00014987","kind":"vulnerability","title":"PyJWKClient unbounded JWKS endpoint requests via attacker-controlled kid values (DoS)","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-fhv5-28vv-h8m8","CVE-2026-48524"],"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-01403dcba54311a154708b77faede94b"],"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":"2026-07-31T22:13:03.000Z","value":"3.7 low","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-01403dcba54311a154708b77faede94b"}],"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-01403dcba54311a154708b77faede94b","url":"https://github.com/advisories/GHSA-fhv5-28vv-h8m8","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-fhv5-28vv-h8m8","publisher":"GitHub Advisory Database","observed_at":"2026-11-03T09:58:33.950Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-01403dcba54311a154708b77faede94b"],"technology":"pyjwt","known_exclusions":[],"conditions_summary":"> [!NOTE]\n>  The vulnerability surfaces only when a JWKS fetch fails; an attacker can attempt to provoke that with sustained unknown-kid traffic, but the outcome depends on upstream JWKS-endpoint behavior (rate limiting, transient errors) which is beyond the attacker's control. Impact is reduced auth availability until the next successful fetch, not complete denial of service.\n\n## Summary\nPyJWKClient.get_signing_key() forces a fresh HTTP request to the JWKS endpoint for every JWT with an unknown kid value, with no rate limiting. Since kid comes from the unverified token header, an attacker can trigger unlimited outbound requests.\n\nAdditionally, fetch_data() finally block clears the JWKS cache on network error.\n\n## Root Cause\njwt/jwks_client.py:172-198 - get_signing_key(kid) calls get_signing_keys(refresh=True) for unknown kids, bypassing TTL cache with no cooldown.\njwt/jwks_client.py:120-122 - finally block writes None to cache on error, clearing valid data.\n\n## Impact\n- DoS against JWKS endpoint (unlimited requests per invalid token)\n- DoS against application (network I/O latency)\n- Cascading failure (rate limiting clears cache, breaking legitimate auth)\n\n## Suggested Fix\n1. Add r","public_affected_ranges":[">= 2.0.0, <= 2.12.1"]}],"null_published_at":"2026-11-03T10:03:26.531Z","source_updated_at":"2026-07-31T22:13:03.000Z","source_disclosed_at":"2026-06-15T17:28:46.000Z","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":"2026-11-03T09:58:33.950Z"}],"next_cursor":null,"snapshot_revision":"42594"}