{"items":[{"id":"NVI-00012122","kind":"vulnerability","title":"fast-jwt: createVerifier accepts unsigned JWTs when key is '' or null and algorithms is explicitly set","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-8wpc-h4q6-8fxv","CVE-2026-107720"],"plain_summary":"GitHub lists this reviewed advisory for fast-jwt. 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-056733cc7f2002e9955d61659c237e3d"],"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":"2026-10-08T22:02:13.000Z","value":"7.4 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-adaa104a0303cac081fd4b6475976f5f"},{"kind":"CVSS","as_of":"2026-10-09T15:17:08.947Z","value":"7.4 HIGH (3.1)","meaning":"security-advisories@github.com severity; no combined Null risk score.","source_id":"sr-57d226a2e1eeb8853602361c9554b319"},{"kind":"EPSS","as_of":"2026-10-31T12:00:27.000Z","value":"0.324%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.25467. Missing scores are unknown.","source_id":"sr-056733cc7f2002e9955d61659c237e3d"}],"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-adaa104a0303cac081fd4b6475976f5f","url":"https://github.com/advisories/GHSA-8wpc-h4q6-8fxv","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-8wpc-h4q6-8fxv","publisher":"GitHub Advisory Database","observed_at":"2026-11-01T00:58:23.763Z"},{"id":"sr-57d226a2e1eeb8853602361c9554b319","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-107720","basis":"official_catalog","notes":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","title":"CVE-2026-107720","publisher":"NIST National Vulnerability Database","observed_at":"2026-11-03T09:58:29.490Z"},{"id":"sr-056733cc7f2002e9955d61659c237e3d","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-2026-107720","publisher":"FIRST EPSS","observed_at":"2026-11-01T01:39:43.065Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-adaa104a0303cac081fd4b6475976f5f"],"technology":"fast-jwt","known_exclusions":[],"conditions_summary":"### Summary\n\n`createVerifier` in fast-jwt ≤ 6.3.0 skips signature verification entirely when the `key` option is a falsy synchronous value (`''` or `null`) **and** the `algorithms` option is set to a non-empty allowlist. An attacker who can present a JWT to the application — regardless of algorithm — can forge arbitrary claims without possessing any signing key.\n\n### Details\n\n**Root cause — four cooperating code paths:**\n\n**A. Falsy sync keys bypass `prepareKeyOrSecret`**\n\n`createVerifier` branches on `typeof key`:\n\n```js\nconst keyType = typeof key\nif (keyType !== 'string' && keyType !== 'object' && keyType !== 'function') {\n  throw new TokenError(/* ... */)\n}\nif (key && keyType !== 'function') {\n  key = prepareKeyOrSecret(key, hsAlgorithms.includes(availableAlgorithms[0]))\n}\n```\n\nWhen `key` is `''` (string, falsy) or `null` (object, falsy) the outer type check passes but the `if (key && ...)` guard never calls `prepareKeyOrSecret`. The empty-secret rejection added in that function is therefore never reached for sync keys:\n\n```js\nfunction prepareKeyOrSecret(key, isSecret) {\n  if (isSecret && key.length === 0) {\n    throw new TokenError(TokenError.codes.invalidKey, 'The key cannot b","public_affected_ranges":["<= 6.3.0"]}],"null_published_at":"2026-11-05T19:10:23.276Z","source_updated_at":"2026-10-08T22:02:13.000Z","source_disclosed_at":"2026-10-08T22:02:12.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Source facts changed; compare the preserved prior revision.","null_first_observed_at":"2026-11-01T00:58:23.763Z"},{"id":"NVI-00012122","kind":"vulnerability","title":"fast-jwt: createVerifier accepts unsigned JWTs when key is '' or null and algorithms is explicitly set","revision":2,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-8wpc-h4q6-8fxv","CVE-2026-107720"],"plain_summary":"GitHub lists this reviewed advisory for fast-jwt. 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-056733cc7f2002e9955d61659c237e3d"],"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":"2026-10-08T22:02:13.000Z","value":"7.4 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-adaa104a0303cac081fd4b6475976f5f"},{"kind":"EPSS","as_of":"2026-10-31T12:00:27.000Z","value":"0.324%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.25467. Missing scores are unknown.","source_id":"sr-056733cc7f2002e9955d61659c237e3d"}],"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-adaa104a0303cac081fd4b6475976f5f","url":"https://github.com/advisories/GHSA-8wpc-h4q6-8fxv","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-8wpc-h4q6-8fxv","publisher":"GitHub Advisory Database","observed_at":"2026-11-01T00:58:23.763Z"},{"id":"sr-056733cc7f2002e9955d61659c237e3d","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-2026-107720","publisher":"FIRST EPSS","observed_at":"2026-11-01T01:39:43.065Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-adaa104a0303cac081fd4b6475976f5f"],"technology":"fast-jwt","known_exclusions":[],"conditions_summary":"### Summary\n\n`createVerifier` in fast-jwt ≤ 6.3.0 skips signature verification entirely when the `key` option is a falsy synchronous value (`''` or `null`) **and** the `algorithms` option is set to a non-empty allowlist. An attacker who can present a JWT to the application — regardless of algorithm — can forge arbitrary claims without possessing any signing key.\n\n### Details\n\n**Root cause — four cooperating code paths:**\n\n**A. Falsy sync keys bypass `prepareKeyOrSecret`**\n\n`createVerifier` branches on `typeof key`:\n\n```js\nconst keyType = typeof key\nif (keyType !== 'string' && keyType !== 'object' && keyType !== 'function') {\n  throw new TokenError(/* ... */)\n}\nif (key && keyType !== 'function') {\n  key = prepareKeyOrSecret(key, hsAlgorithms.includes(availableAlgorithms[0]))\n}\n```\n\nWhen `key` is `''` (string, falsy) or `null` (object, falsy) the outer type check passes but the `if (key && ...)` guard never calls `prepareKeyOrSecret`. The empty-secret rejection added in that function is therefore never reached for sync keys:\n\n```js\nfunction prepareKeyOrSecret(key, isSecret) {\n  if (isSecret && key.length === 0) {\n    throw new TokenError(TokenError.codes.invalidKey, 'The key cannot b","public_affected_ranges":["<= 6.3.0"]}],"null_published_at":"2026-11-01T14:34:14.093Z","source_updated_at":"2026-10-08T22:02:13.000Z","source_disclosed_at":"2026-10-08T22:02:12.000Z","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":"2026-11-01T00:58:23.763Z"},{"id":"NVI-00012122","kind":"vulnerability","title":"fast-jwt: createVerifier accepts unsigned JWTs when key is '' or null and algorithms is explicitly set","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-8wpc-h4q6-8fxv","CVE-2026-107720"],"plain_summary":"GitHub lists this reviewed advisory for fast-jwt. 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-adaa104a0303cac081fd4b6475976f5f"],"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":"2026-10-08T22:02:13.000Z","value":"7.4 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-adaa104a0303cac081fd4b6475976f5f"}],"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-adaa104a0303cac081fd4b6475976f5f","url":"https://github.com/advisories/GHSA-8wpc-h4q6-8fxv","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-8wpc-h4q6-8fxv","publisher":"GitHub Advisory Database","observed_at":"2026-11-01T00:58:23.763Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-adaa104a0303cac081fd4b6475976f5f"],"technology":"fast-jwt","known_exclusions":[],"conditions_summary":"### Summary\n\n`createVerifier` in fast-jwt ≤ 6.3.0 skips signature verification entirely when the `key` option is a falsy synchronous value (`''` or `null`) **and** the `algorithms` option is set to a non-empty allowlist. An attacker who can present a JWT to the application — regardless of algorithm — can forge arbitrary claims without possessing any signing key.\n\n### Details\n\n**Root cause — four cooperating code paths:**\n\n**A. Falsy sync keys bypass `prepareKeyOrSecret`**\n\n`createVerifier` branches on `typeof key`:\n\n```js\nconst keyType = typeof key\nif (keyType !== 'string' && keyType !== 'object' && keyType !== 'function') {\n  throw new TokenError(/* ... */)\n}\nif (key && keyType !== 'function') {\n  key = prepareKeyOrSecret(key, hsAlgorithms.includes(availableAlgorithms[0]))\n}\n```\n\nWhen `key` is `''` (string, falsy) or `null` (object, falsy) the outer type check passes but the `if (key && ...)` guard never calls `prepareKeyOrSecret`. The empty-secret rejection added in that function is therefore never reached for sync keys:\n\n```js\nfunction prepareKeyOrSecret(key, isSecret) {\n  if (isSecret && key.length === 0) {\n    throw new TokenError(TokenError.codes.invalidKey, 'The key cannot b","public_affected_ranges":["<= 6.3.0"]}],"null_published_at":"2026-11-01T01:03:56.632Z","source_updated_at":"2026-10-08T22:02:13.000Z","source_disclosed_at":"2026-10-08T22:02:12.000Z","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":"2026-11-01T00:58:23.763Z"}],"next_cursor":null,"snapshot_revision":"42594"}