{"items":[{"id":"NVI-00009050","kind":"vulnerability","title":"decode-uri-component vulnerable to denial of service via quadratic replacement of percent-encoded runs","revision":3,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-qr28-fpjm-wq7f","CVE-2026-118664"],"plain_summary":"GitHub lists this reviewed advisory for decode-uri-component. 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-a8a172859da66edb40c66e5487e1cd22"],"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},{"summary":"The original advisory lists fixed boundaries 0.5.1 for decode-uri-component. Confirm the publisher’s latest guidance.","source_ids":["sr-61981a9e40b2d5912fcbccaf9c3cac6a"],"action_type":"vendor_patch","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":"EPSS","as_of":"2026-10-31T12:00:27.000Z","value":"0.318%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.24817. Missing scores are unknown.","source_id":"sr-a8a172859da66edb40c66e5487e1cd22"}],"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-92545911152dcfebc6c989fdd7dbc2ef","url":"https://github.com/advisories/GHSA-qr28-fpjm-wq7f","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-qr28-fpjm-wq7f","publisher":"GitHub Advisory Database","observed_at":"2026-10-31T21:55:49.621Z"},{"id":"sr-61981a9e40b2d5912fcbccaf9c3cac6a","url":"https://github.com/advisories/GHSA-qr28-fpjm-wq7f","basis":"vendor_advisory","notes":"GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.","title":"GHSA-qr28-fpjm-wq7f","publisher":"GitHub Advisory Database via OSV","observed_at":"2026-11-01T01:40:36.498Z"},{"id":"sr-a8a172859da66edb40c66e5487e1cd22","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-2026-118664","publisher":"FIRST EPSS","observed_at":"2026-10-31T22:06:15.375Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-92545911152dcfebc6c989fdd7dbc2ef"],"technology":"decode-uri-component","known_exclusions":[],"conditions_summary":"### Summary\n\n`decodeUriComponent()` takes quadratic time on malformed input that has many distinct percent-encoded runs. A single unauthenticated request of about 224 KB can block the Node.js event loop for about 20 seconds. Version 0.5.0, the release that fixed CVE-2026-45822, is affected.\n\n### Details\n\nWhen native decodeURIComponent throws, `decodeUriComponent()` falls back to `customDecodeURIComponent` (`index.js:122`). That function:\n1. Scans the input for every run of percent-encoded bytes (e.g. `%C3%A5`) and stores each distinct run, with its decoded value, in a lookup table (`index.js:130-144`).\n2. Runs one full-string `input.replace(new RegExp(key, 'g'), …)` per table entry (`index.js:154`).\n\nWith K distinct runs in an input of length L, that's K regex compilations and K full scans of the string, so O(K·L). An attacker controls both K and L, and K grows with L. One malformed sequence such as a trailing `%zz` is enough to force the fallback path.\n\nThe 0.5.0 fix for CVE-2026-45822 (`fa479da`) replaced the recursive `decode()` routine with a linear scanner, but left this replacement loop unchanged.\n\n### Proof of concept\n\nRunning the following code takes ~20 seconds.\n\n```js\nimp","public_affected_ranges":["<= 0.5.0"]},{"certainty":"source_listed","source_ids":["sr-61981a9e40b2d5912fcbccaf9c3cac6a"],"technology":"decode-uri-component","known_exclusions":[],"conditions_summary":"### Summary\n\n`decodeUriComponent()` takes quadratic time on malformed input that has many distinct percent-encoded runs. A single unauthenticated request of about 224 KB can block the Node.js event loop for about 20 seconds. Version 0.5.0, the release that fixed CVE-2026-45822, is affected.\n\n### Details\n\nWhen native decodeURIComponent throws, `decodeUriComponent()` falls back to `customDecodeURIComponent` (`index.js:122`). That function:\n1. Scans the input for every run of percent-encoded bytes (e.g. `%C3%A5`) and stores each distinct run, with its decoded value, in a lookup table (`index.js:130-144`).\n2. Runs one full-string `input.replace(new RegExp(key, 'g'), …)` per table entry (`index.js:154`).\n\nWith K distinct runs in an input of length L, that's K regex compilations and K full scans of the string, so O(K·L). An attacker controls both K and L, and K grows with L. One malformed sequence such as a trailing `%zz` is enough to force the fallback path.\n\nThe 0.5.0 fix for CVE-2026-45822 (`fa479da`) replaced the recursive `decode()` routine with a linear scanner, but left this replacement loop unchanged.\n\n### Proof of concept\n\nRunning the following code takes ~20 seconds.\n\n```js\nimp","public_affected_ranges":["SEMVER: introduced 0; fixed 0.5.1"]}],"null_published_at":"2026-11-05T03:52:54.751Z","source_updated_at":"2026-10-29T16:41:29.000Z","source_disclosed_at":"2026-10-29T16:41:28.000Z","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":"2026-10-31T21:55:49.621Z"},{"id":"NVI-00009050","kind":"vulnerability","title":"decode-uri-component vulnerable to denial of service via quadratic replacement of percent-encoded runs","revision":2,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-qr28-fpjm-wq7f","CVE-2026-118664"],"plain_summary":"GitHub lists this reviewed advisory for decode-uri-component. 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-92545911152dcfebc6c989fdd7dbc2ef"],"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},{"summary":"The original advisory lists fixed boundaries 0.5.1 for decode-uri-component. Confirm the publisher’s latest guidance.","source_ids":["sr-61981a9e40b2d5912fcbccaf9c3cac6a"],"action_type":"vendor_patch","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":[],"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-92545911152dcfebc6c989fdd7dbc2ef","url":"https://github.com/advisories/GHSA-qr28-fpjm-wq7f","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-qr28-fpjm-wq7f","publisher":"GitHub Advisory Database","observed_at":"2026-10-31T21:55:49.621Z"},{"id":"sr-61981a9e40b2d5912fcbccaf9c3cac6a","url":"https://github.com/advisories/GHSA-qr28-fpjm-wq7f","basis":"vendor_advisory","notes":"GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.","title":"GHSA-qr28-fpjm-wq7f","publisher":"GitHub Advisory Database via OSV","observed_at":"2026-11-01T01:40:36.498Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-92545911152dcfebc6c989fdd7dbc2ef"],"technology":"decode-uri-component","known_exclusions":[],"conditions_summary":"### Summary\n\n`decodeUriComponent()` takes quadratic time on malformed input that has many distinct percent-encoded runs. A single unauthenticated request of about 224 KB can block the Node.js event loop for about 20 seconds. Version 0.5.0, the release that fixed CVE-2026-45822, is affected.\n\n### Details\n\nWhen native decodeURIComponent throws, `decodeUriComponent()` falls back to `customDecodeURIComponent` (`index.js:122`). That function:\n1. Scans the input for every run of percent-encoded bytes (e.g. `%C3%A5`) and stores each distinct run, with its decoded value, in a lookup table (`index.js:130-144`).\n2. Runs one full-string `input.replace(new RegExp(key, 'g'), …)` per table entry (`index.js:154`).\n\nWith K distinct runs in an input of length L, that's K regex compilations and K full scans of the string, so O(K·L). An attacker controls both K and L, and K grows with L. One malformed sequence such as a trailing `%zz` is enough to force the fallback path.\n\nThe 0.5.0 fix for CVE-2026-45822 (`fa479da`) replaced the recursive `decode()` routine with a linear scanner, but left this replacement loop unchanged.\n\n### Proof of concept\n\nRunning the following code takes ~20 seconds.\n\n```js\nimp","public_affected_ranges":["<= 0.5.0"]},{"certainty":"source_listed","source_ids":["sr-61981a9e40b2d5912fcbccaf9c3cac6a"],"technology":"decode-uri-component","known_exclusions":[],"conditions_summary":"### Summary\n\n`decodeUriComponent()` takes quadratic time on malformed input that has many distinct percent-encoded runs. A single unauthenticated request of about 224 KB can block the Node.js event loop for about 20 seconds. Version 0.5.0, the release that fixed CVE-2026-45822, is affected.\n\n### Details\n\nWhen native decodeURIComponent throws, `decodeUriComponent()` falls back to `customDecodeURIComponent` (`index.js:122`). That function:\n1. Scans the input for every run of percent-encoded bytes (e.g. `%C3%A5`) and stores each distinct run, with its decoded value, in a lookup table (`index.js:130-144`).\n2. Runs one full-string `input.replace(new RegExp(key, 'g'), …)` per table entry (`index.js:154`).\n\nWith K distinct runs in an input of length L, that's K regex compilations and K full scans of the string, so O(K·L). An attacker controls both K and L, and K grows with L. One malformed sequence such as a trailing `%zz` is enough to force the fallback path.\n\nThe 0.5.0 fix for CVE-2026-45822 (`fa479da`) replaced the recursive `decode()` routine with a linear scanner, but left this replacement loop unchanged.\n\n### Proof of concept\n\nRunning the following code takes ~20 seconds.\n\n```js\nimp","public_affected_ranges":["SEMVER: introduced 0; fixed 0.5.1"]}],"null_published_at":"2026-11-01T14:34:14.084Z","source_updated_at":"2026-10-29T16:41:29.000Z","source_disclosed_at":"2026-10-29T16:41:28.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Source facts changed; compare the preserved prior revision.","null_first_observed_at":"2026-10-31T21:55:49.621Z"},{"id":"NVI-00009050","kind":"vulnerability","title":"decode-uri-component vulnerable to denial of service via quadratic replacement of percent-encoded runs","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-qr28-fpjm-wq7f","CVE-2026-118664"],"plain_summary":"GitHub lists this reviewed advisory for decode-uri-component. 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-92545911152dcfebc6c989fdd7dbc2ef"],"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":[],"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-92545911152dcfebc6c989fdd7dbc2ef","url":"https://github.com/advisories/GHSA-qr28-fpjm-wq7f","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-qr28-fpjm-wq7f","publisher":"GitHub Advisory Database","observed_at":"2026-10-31T21:55:49.621Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-92545911152dcfebc6c989fdd7dbc2ef"],"technology":"decode-uri-component","known_exclusions":[],"conditions_summary":"### Summary\n\n`decodeUriComponent()` takes quadratic time on malformed input that has many distinct percent-encoded runs. A single unauthenticated request of about 224 KB can block the Node.js event loop for about 20 seconds. Version 0.5.0, the release that fixed CVE-2026-45822, is affected.\n\n### Details\n\nWhen native decodeURIComponent throws, `decodeUriComponent()` falls back to `customDecodeURIComponent` (`index.js:122`). That function:\n1. Scans the input for every run of percent-encoded bytes (e.g. `%C3%A5`) and stores each distinct run, with its decoded value, in a lookup table (`index.js:130-144`).\n2. Runs one full-string `input.replace(new RegExp(key, 'g'), …)` per table entry (`index.js:154`).\n\nWith K distinct runs in an input of length L, that's K regex compilations and K full scans of the string, so O(K·L). An attacker controls both K and L, and K grows with L. One malformed sequence such as a trailing `%zz` is enough to force the fallback path.\n\nThe 0.5.0 fix for CVE-2026-45822 (`fa479da`) replaced the recursive `decode()` routine with a linear scanner, but left this replacement loop unchanged.\n\n### Proof of concept\n\nRunning the following code takes ~20 seconds.\n\n```js\nimp","public_affected_ranges":["<= 0.5.0"]}],"null_published_at":"2026-10-31T22:13:31.271Z","source_updated_at":"2026-10-29T16:41:29.000Z","source_disclosed_at":"2026-10-29T16:41:28.000Z","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":"2026-10-31T21:55:49.621Z"}],"next_cursor":null,"snapshot_revision":"42594"}