{"items":[{"id":"NVI-00013918","kind":"vulnerability","title":"fast-uri vulnerable to server-side request forgery via repeated hostname percent-decoding","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-fph4-wmhf-6fwf","CVE-2026-75899"],"plain_summary":"GitHub lists this reviewed advisory for fast-uri, fast-uri, fast-uri. 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-4a4159f5289d4f79df425e6ec570cc88"],"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":"2026-09-02T15:42:41.000Z","value":"7.5 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-1d6fb0f208028db739e8edd6e6c7b31c"},{"kind":"CVSS","as_of":"2026-10-14T13:10:00.187Z","value":"7.5 HIGH (3.1)","meaning":"ce714d77-add3-4f53-aff5-83d477b104bb severity; no combined Null risk score.","source_id":"sr-4a4159f5289d4f79df425e6ec570cc88"}],"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-1d6fb0f208028db739e8edd6e6c7b31c","url":"https://github.com/advisories/GHSA-fph4-wmhf-6fwf","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-fph4-wmhf-6fwf","publisher":"GitHub Advisory Database","observed_at":"2026-11-02T02:21:43.711Z"},{"id":"sr-4a4159f5289d4f79df425e6ec570cc88","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-75899","basis":"official_catalog","notes":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","title":"CVE-2026-75899","publisher":"NIST National Vulnerability Database","observed_at":"2026-11-08T19:47:48.947Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-1d6fb0f208028db739e8edd6e6c7b31c"],"technology":"fast-uri","known_exclusions":[],"conditions_summary":"### Impact\n\n`fast-uri` decodes a hostname's percent escapes twice in a single `normalize()` or `resolve()` call: once during parsing and again during authority recomposition. A nested percent-encoded host therefore survives the first decode and is turned into a live destination by the second, so `normalize('http://%256c%256f%2563%2561%256c%2568%256f%2573%2574/')` returns `http://localhost/`. Applications that normalize or resolve an untrusted URI before an SSRF check, redirect validation, or host allowlist can be steered to a different destination, including internal addresses such as loopback or a cloud metadata endpoint, than the encoded input appeared to contain. This is an incomplete-fix variant of CVE-2026-6322, whose encoded-authority-delimiter fix introduced the second decode.\n\n### Patches\n\nFixed in `fast-uri` 2.4.5, 3.1.6, and 4.1.3.\n\n### Workarounds\n\nReject untrusted URIs whose host component contains an encoded percent sign (`%25`) before passing them to `normalize()` or `resolve()`.","public_affected_ranges":[">= 2.4.1, < 2.4.5"]},{"certainty":"source_listed","source_ids":["sr-1d6fb0f208028db739e8edd6e6c7b31c"],"technology":"fast-uri","known_exclusions":[],"conditions_summary":"### Impact\n\n`fast-uri` decodes a hostname's percent escapes twice in a single `normalize()` or `resolve()` call: once during parsing and again during authority recomposition. A nested percent-encoded host therefore survives the first decode and is turned into a live destination by the second, so `normalize('http://%256c%256f%2563%2561%256c%2568%256f%2573%2574/')` returns `http://localhost/`. Applications that normalize or resolve an untrusted URI before an SSRF check, redirect validation, or host allowlist can be steered to a different destination, including internal addresses such as loopback or a cloud metadata endpoint, than the encoded input appeared to contain. This is an incomplete-fix variant of CVE-2026-6322, whose encoded-authority-delimiter fix introduced the second decode.\n\n### Patches\n\nFixed in `fast-uri` 2.4.5, 3.1.6, and 4.1.3.\n\n### Workarounds\n\nReject untrusted URIs whose host component contains an encoded percent sign (`%25`) before passing them to `normalize()` or `resolve()`.","public_affected_ranges":[">= 3.1.2, < 3.1.6"]},{"certainty":"source_listed","source_ids":["sr-1d6fb0f208028db739e8edd6e6c7b31c"],"technology":"fast-uri","known_exclusions":[],"conditions_summary":"### Impact\n\n`fast-uri` decodes a hostname's percent escapes twice in a single `normalize()` or `resolve()` call: once during parsing and again during authority recomposition. A nested percent-encoded host therefore survives the first decode and is turned into a live destination by the second, so `normalize('http://%256c%256f%2563%2561%256c%2568%256f%2573%2574/')` returns `http://localhost/`. Applications that normalize or resolve an untrusted URI before an SSRF check, redirect validation, or host allowlist can be steered to a different destination, including internal addresses such as loopback or a cloud metadata endpoint, than the encoded input appeared to contain. This is an incomplete-fix variant of CVE-2026-6322, whose encoded-authority-delimiter fix introduced the second decode.\n\n### Patches\n\nFixed in `fast-uri` 2.4.5, 3.1.6, and 4.1.3.\n\n### Workarounds\n\nReject untrusted URIs whose host component contains an encoded percent sign (`%25`) before passing them to `normalize()` or `resolve()`.","public_affected_ranges":[">= 4.0.0, < 4.1.3"]}],"null_published_at":"2026-11-08T19:53:44.055Z","source_updated_at":"2026-09-02T15:42:41.000Z","source_disclosed_at":"2026-09-02T15:42:39.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Source facts changed; compare the preserved prior revision.","null_first_observed_at":"2026-11-02T02:21:43.711Z"},{"id":"NVI-00013918","kind":"vulnerability","title":"fast-uri vulnerable to server-side request forgery via repeated hostname percent-decoding","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-fph4-wmhf-6fwf","CVE-2026-75899"],"plain_summary":"GitHub lists this reviewed advisory for fast-uri, fast-uri, fast-uri. 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-1d6fb0f208028db739e8edd6e6c7b31c"],"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":"2026-09-02T15:42:41.000Z","value":"7.5 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-1d6fb0f208028db739e8edd6e6c7b31c"}],"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-1d6fb0f208028db739e8edd6e6c7b31c","url":"https://github.com/advisories/GHSA-fph4-wmhf-6fwf","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-fph4-wmhf-6fwf","publisher":"GitHub Advisory Database","observed_at":"2026-11-02T02:21:43.711Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-1d6fb0f208028db739e8edd6e6c7b31c"],"technology":"fast-uri","known_exclusions":[],"conditions_summary":"### Impact\n\n`fast-uri` decodes a hostname's percent escapes twice in a single `normalize()` or `resolve()` call: once during parsing and again during authority recomposition. A nested percent-encoded host therefore survives the first decode and is turned into a live destination by the second, so `normalize('http://%256c%256f%2563%2561%256c%2568%256f%2573%2574/')` returns `http://localhost/`. Applications that normalize or resolve an untrusted URI before an SSRF check, redirect validation, or host allowlist can be steered to a different destination, including internal addresses such as loopback or a cloud metadata endpoint, than the encoded input appeared to contain. This is an incomplete-fix variant of CVE-2026-6322, whose encoded-authority-delimiter fix introduced the second decode.\n\n### Patches\n\nFixed in `fast-uri` 2.4.5, 3.1.6, and 4.1.3.\n\n### Workarounds\n\nReject untrusted URIs whose host component contains an encoded percent sign (`%25`) before passing them to `normalize()` or `resolve()`.","public_affected_ranges":[">= 2.4.1, < 2.4.5"]},{"certainty":"source_listed","source_ids":["sr-1d6fb0f208028db739e8edd6e6c7b31c"],"technology":"fast-uri","known_exclusions":[],"conditions_summary":"### Impact\n\n`fast-uri` decodes a hostname's percent escapes twice in a single `normalize()` or `resolve()` call: once during parsing and again during authority recomposition. A nested percent-encoded host therefore survives the first decode and is turned into a live destination by the second, so `normalize('http://%256c%256f%2563%2561%256c%2568%256f%2573%2574/')` returns `http://localhost/`. Applications that normalize or resolve an untrusted URI before an SSRF check, redirect validation, or host allowlist can be steered to a different destination, including internal addresses such as loopback or a cloud metadata endpoint, than the encoded input appeared to contain. This is an incomplete-fix variant of CVE-2026-6322, whose encoded-authority-delimiter fix introduced the second decode.\n\n### Patches\n\nFixed in `fast-uri` 2.4.5, 3.1.6, and 4.1.3.\n\n### Workarounds\n\nReject untrusted URIs whose host component contains an encoded percent sign (`%25`) before passing them to `normalize()` or `resolve()`.","public_affected_ranges":[">= 3.1.2, < 3.1.6"]},{"certainty":"source_listed","source_ids":["sr-1d6fb0f208028db739e8edd6e6c7b31c"],"technology":"fast-uri","known_exclusions":[],"conditions_summary":"### Impact\n\n`fast-uri` decodes a hostname's percent escapes twice in a single `normalize()` or `resolve()` call: once during parsing and again during authority recomposition. A nested percent-encoded host therefore survives the first decode and is turned into a live destination by the second, so `normalize('http://%256c%256f%2563%2561%256c%2568%256f%2573%2574/')` returns `http://localhost/`. Applications that normalize or resolve an untrusted URI before an SSRF check, redirect validation, or host allowlist can be steered to a different destination, including internal addresses such as loopback or a cloud metadata endpoint, than the encoded input appeared to contain. This is an incomplete-fix variant of CVE-2026-6322, whose encoded-authority-delimiter fix introduced the second decode.\n\n### Patches\n\nFixed in `fast-uri` 2.4.5, 3.1.6, and 4.1.3.\n\n### Workarounds\n\nReject untrusted URIs whose host component contains an encoded percent sign (`%25`) before passing them to `normalize()` or `resolve()`.","public_affected_ranges":[">= 4.0.0, < 4.1.3"]}],"null_published_at":"2026-11-02T10:00:37.174Z","source_updated_at":"2026-09-02T15:42:41.000Z","source_disclosed_at":"2026-09-02T15:42:39.000Z","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":"2026-11-02T02:21:43.711Z"}],"next_cursor":null,"snapshot_revision":"42594"}