{"id":"CVE-2026-83619","aliases":["AZL-99336","CLSA-2026-1790755546","DEBIAN-CVE-2026-83619","EUVD-2026-69248","GHSA-x4fp-j954-r2f4","UBUNTU-CVE-2026-83619"],"status":"published","title":"xmldom: End-tag Whitespace-Trim Regex ReDoS — quadratic backtracking in the 0.8.x end-tag parser","description":"xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. From 0.7.0 until 0.8.15, the release-0.8.x parser in lib/sax.js trims captured end-tag names with the unanchored global expression /[ \\t\\n\\r]+$/g. For an end tag containing a long whitespace run followed by a non-whitespace character, the expression retries from each possible starting position and backtracks quadratically before failing its end anchor. DOMParser.parseFromString() reaches the path under default options, allowing a small unauthenticated XML input to stall the Node.js event loop; the 0.9.x and unscoped npm lines do not contain this expression. This issue is fixed in @xmldom/xmldom version 0.8.15.","severity":{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00524,"percentile":0.44938,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-1333","CWE-400"],"published":"2026-09-01T14:51:28Z","modified":"2026-10-28T02:30:55Z","fixes":[{"ecosystem":"npm","package":"@xmldom/xmldom","fixed_in":["0.8.15"],"sources":["ghsa","osv"]},{"ecosystem":"Debian:13","package":"node-xmldom","fixed_in":["0.9.5-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"node-xmldom","fixed_in":["0.9.5-1"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"@xmldom/xmldom","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0.7.0"},{"last_affected":"0.8.14"},{"fixed":"0.8.15"}]}]},{"source":"osv","ecosystem":"Azure Linux:3","package":"python-tensorboard","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"2.16.2-6"}]}]},{"source":"osv","ecosystem":"TuxCare:npm","package":"@xmldom/xmldom","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0.7.13-tuxcare.0"},{"fixed":"0.7.13-tuxcare.1"}]}],"versions":["0.7.13"],"bundled":14},{"source":"osv","ecosystem":"Debian:12","package":"node-xmldom","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.8.6-1","0.9.10-1","0.9.10-2","0.9.11-1","0.9.12-1","0.9.5-1","0.9.6-1","0.9.8-1","0.9.8-2","0.9.9-1"]},{"source":"osv","ecosystem":"Debian:13","package":"node-xmldom","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.5-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"node-xmldom","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.5-1"}]}]},{"source":"osv","ecosystem":"npm","package":"@xmldom/xmldom","ranges":[{"type":"SEMVER","events":[{"introduced":"0.7.0"},{"fixed":"0.8.15"}]}]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"node-xmldom","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.1.27+ds-1","0.1.27+ds-1+deb10u2build0.20.04.1"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"node-xmldom","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.5.0-1","0.7.3-1","0.7.5-1","0.7.5-1ubuntu0.22.04.1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"node-xmldom","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.8.6-1"]}],"products":[{"vendor":"@xmldom","product":"xmldom"},{"vendor":"xmldom","product":"xmldom"}],"references":[{"url":"https://github.com/xmldom/xmldom/security/advisories/GHSA-x4fp-j954-r2f4","tags":["x_refsource_CONFIRM","advisory","web","report"]},{"url":"https://github.com/xmldom/xmldom/pull/1072","tags":["x_refsource_MISC","fix","web","report"]},{"url":"https://github.com/xmldom/xmldom/commit/3abb0934f5a8a84d83a1f9cde0f2bd04c08b2a09","tags":["x_refsource_MISC","fix","web"]},{"url":"https://github.com/xmldom/xmldom/releases/tag/0.8.15","tags":["x_refsource_MISC","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-83619","tags":["web","advisory"]},{"url":"https://github.com/advisories/GHSA-x4fp-j954-r2f4"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/83xxx/CVE-2026-83619.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-83619","tags":["advisory"]},{"url":"https://github.com/xmldom/xmldom","tags":["package"]},{"url":"https://ubuntu.com/security/CVE-2026-83619","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-83619","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-83619","title":"xmldom: End-tag Whitespace-Trim Regex ReDoS — quadratic backtracking in the 0.8.x end-tag parser","description":"xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. From 0.7.0 until 0.8.15, the release-0.8.x parser in lib/sax.js trims captured end-tag names with the unanchored global expression /[ \\t\\n\\r]+$/g. For an end tag containing a long whitespace run followed by a non-whitespace character, the expression retries from each possible starting position and backtracks quadratically before failing its end anchor. DOMParser.parseFromString() reaches the path under default options, allowing a small unauthenticated XML input to stall the Node.js event loop; the 0.9.x and unscoped npm lines do not contain this expression. This issue is fixed in @xmldom/xmldom version 0.8.15.","status":"published","published":"2026-09-01T14:51:28.121Z","modified":"2026-09-01T18:05:22.049Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna"}],"cwes":["CWE-400","CWE-1333"],"updated_at":"2026-11-02T13:45:14.072357Z"}],"euvd":[{"id":"EUVD-2026-69248","description":"xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. From 0.7.0 until 0.8.15, the release-0.8.x parser in lib/sax.js trims captured end-tag names with the unanchored global expression /[ \\t\\n\\r]+$/g. For an end tag containing a long whitespace run followed by a non-whitespace character, the expression retries from each possible starting position and backtracks quadratically before failing its end anchor. DOMParser.parseFromString() reaches the path under default options, allowing a small unauthenticated XML input to stall the Node.js event loop; the 0.9.x and unscoped npm lines do not contain this expression. This issue is fixed in @xmldom/xmldom version 0.8.15.","status":"published","published":"2026-09-01T14:51:28Z","modified":"2026-09-01T18:05:22Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T18:01:17.32054Z"}],"ghsa":[{"id":"GHSA-x4fp-j954-r2f4","title":"xmldom: End-tag Whitespace-Trim Regex ReDoS — quadratic backtracking in the 0.8.x end-tag parser","description":"## Summary\n\nOn the `@xmldom/xmldom` **`0.8.x`** line, parsing an XML end tag whose name is followed by a long run\nof whitespace and then a non-whitespace character triggers quadratic-time regular-expression\nbacktracking (ReDoS), so a single small crafted end tag stalls the Node.js event loop. It is reachable\nfrom `DOMParser.parseFromString` under **default options**, unauthenticated, before any validity\ncheck — an availability-only denial of service. The `0.9.x` line is **not** affected.\n\n## Details\n\n`lib/sax.js` (release-0.8.x, commit `e5c1480`) trims trailing whitespace from a captured end-tag name\nwith an unanchored global regex:\n\n- `lib/sax.js` line 120: https://github.com/xmldom/xmldom/blob/e5c14802592685bb872c042c54c3f73758875c85/lib/sax.js#L120\n\n```js\n/[ \\t\\n\\r]+$/g\n```\n\nApplied to a string shaped `whitespace-run + one non-whitespace char` (e.g. the content of an end tag\n`\u003c/   …   x\u003e`), the engine must, for every starting position, extend `[ws]+` to the end and then fail\nthe `$` anchor when the trailing non-whitespace char is present — classic O(n²) backtracking in the\nlength of the whitespace run. The trimmed substring is delimited only by `indexOf('\u003e')`, so the\nattacker controls its length directly.\n\n## Proof of Concept\n\n```js\nconst { DOMParser } = require('@xmldom/xmldom'); // 0.8.x\nconst n = 64 * 1024;\nconst payload = '\u003cr\u003e\u003c/' + ' '.repeat(n) + 'x\u003e';\nconsole.time('parse');\nnew DOMParser().parseFromString(payload, 'text/xml');\nconsole.timeEnd('parse');\n```\n\nMeasured (Node 18) — time quadruples per doubling of the whitespace run (canonical O(n²)):\n\n| Whitespace run | Isolated regex | End-to-end `parseFromString` (0.8.13) |\n|---|---|---|\n|  4 KB | 5.6 ms   | 5.7 ms   |\n|  8 KB | 22.7 ms  | 22.5 ms  |\n| 16 KB | 88.6 ms  | 92 ms    |\n| 32 KB | 354 ms   | 361 ms   |\n| 64 KB | 1434 ms  | 1452 ms  |\n| 128 KB | 5761 ms | —        |\n\n## Impact\n\nAvailability only: a single parse of a small crafted document blocks the Node.js event loop for the\nduration of the quadratic scan (≈1.4 s at 64 KB; multi-second with larger inputs). No memory\nblow-up, no data exposure, no integrity impact. Because XML is routinely accepted from untrusted\nsources and parsed with default options, one request can stall a server.\n\n## Affected Versions\n\nAffected on the `0.7.x` and `0.8.x` lines (the trailing-whitespace trim was added in `0.7.0`, present\nthrough `0.8.14`); the fix targets the `0.8.x` LTS patch. The `0.9.x` line rewrote end-tag parsing to\nan anchored linear matcher and never had this regex, so it is **not** affected. No published unscoped\n`xmldom` is affected — the vulnerable code exists only in a `0.7.0` git tag that was never released to\nnpm (`npm view xmldom` → `latest` = 0.6.0).\n\n## Fix Applied\n\nAnchors the end-tag trailing-whitespace trim so it runs in linear time instead of\nbacktracking quadratically on a long whitespace run. Byte-identical output. Non-breaking; 0.8.x-only.\n\n## Severity note\n\nThe complexity is **quadratic**, not exponential, so a multi-second stall requires\ntens-to-hundreds of KB of input. `VA:H` reflects that xmldom applies **no input-size limit** and the\npath runs on default-options parsing, so a single unbounded parse can fully stall the event loop.","status":"published","published":"2026-09-08T21:01:09Z","modified":"2026-09-08T21:01:11Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-400","CWE-1333"],"updated_at":"2026-11-02T14:41:14.764963Z"}],"nvd":[{"id":"CVE-2026-83619","description":"xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. From 0.7.0 until 0.8.15, the release-0.8.x parser in lib/sax.js trims captured end-tag names with the unanchored global expression /[ \\t\\n\\r]+$/g. For an end tag containing a long whitespace run followed by a non-whitespace character, the expression retries from each possible starting position and backtracks quadratically before failing its end anchor. DOMParser.parseFromString() reaches the path under default options, allowing a small unauthenticated XML input to stall the Node.js event loop; the 0.9.x and unscoped npm lines do not contain this expression. This issue is fixed in @xmldom/xmldom version 0.8.15.","status":"published","published":"2026-09-01T15:17:40.657Z","modified":"2026-09-08T21:11:31.703Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"}],"cwes":["CWE-400","CWE-1333"],"updated_at":"2026-11-02T14:12:43.04945Z"}],"osv":[{"id":"CVE-2026-83619","title":"xmldom: End-tag Whitespace-Trim Regex ReDoS — quadratic backtracking in the 0.8.x end-tag parser","description":"xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. From 0.7.0 until 0.8.15, the release-0.8.x parser in lib/sax.js trims captured end-tag names with the unanchored global expression /[ \\t\\n\\r]+$/g. For an end tag containing a long whitespace run followed by a non-whitespace character, the expression retries from each possible starting position and backtracks quadratically before failing its end anchor. DOMParser.parseFromString() reaches the path under default options, allowing a small unauthenticated XML input to stall the Node.js event loop; the 0.9.x and unscoped npm lines do not contain this expression. This issue is fixed in @xmldom/xmldom version 0.8.15.","status":"published","published":"2026-09-01T14:51:28.121Z","modified":"2026-11-11T02:48:52.919123182Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-1333","CWE-400"],"updated_at":"2026-11-11T03:21:38.364245Z"},{"id":"DEBIAN-CVE-2026-83619","description":"xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. From 0.7.0 until 0.8.15, the release-0.8.x parser in lib/sax.js trims captured end-tag names with the unanchored global expression /[ \\t\\n\\r]+$/g. For an end tag containing a long whitespace run followed by a non-whitespace character, the expression retries from each possible starting position and backtracks quadratically before failing its end anchor. DOMParser.parseFromString() reaches the path under default options, allowing a small unauthenticated XML input to stall the Node.js event loop; the 0.9.x and unscoped npm lines do not contain this expression. This issue is fixed in @xmldom/xmldom version 0.8.15.","status":"published","published":"2026-09-01T15:17:40.657Z","modified":"2026-10-01T03:03:43.916398406Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high"}],"updated_at":"2026-11-02T15:46:04.577397Z"},{"id":"GHSA-x4fp-j954-r2f4","title":"xmldom: End-tag Whitespace-Trim Regex ReDoS — quadratic backtracking in the 0.8.x end-tag parser","description":"## Summary\n\nOn the `@xmldom/xmldom` **`0.8.x`** line, parsing an XML end tag whose name is followed by a long run\nof whitespace and then a non-whitespace character triggers quadratic-time regular-expression\nbacktracking (ReDoS), so a single small crafted end tag stalls the Node.js event loop. It is reachable\nfrom `DOMParser.parseFromString` under **default options**, unauthenticated, before any validity\ncheck — an availability-only denial of service. The `0.9.x` line is **not** affected.\n\n## Details\n\n`lib/sax.js` (release-0.8.x, commit `e5c1480`) trims trailing whitespace from a captured end-tag name\nwith an unanchored global regex:\n\n- `lib/sax.js` line 120: https://github.com/xmldom/xmldom/blob/e5c14802592685bb872c042c54c3f73758875c85/lib/sax.js#L120\n\n```js\n/[ \\t\\n\\r]+$/g\n```\n\nApplied to a string shaped `whitespace-run + one non-whitespace char` (e.g. the content of an end tag\n`\u003c/   …   x\u003e`), the engine must, for every starting position, extend `[ws]+` to the end and then fail\nthe `$` anchor when the trailing non-whitespace char is present — classic O(n²) backtracking in the\nlength of the whitespace run. The trimmed substring is delimited only by `indexOf('\u003e')`, so the\nattacker controls its length directly.\n\n## Proof of Concept\n\n```js\nconst { DOMParser } = require('@xmldom/xmldom'); // 0.8.x\nconst n = 64 * 1024;\nconst payload = '\u003cr\u003e\u003c/' + ' '.repeat(n) + 'x\u003e';\nconsole.time('parse');\nnew DOMParser().parseFromString(payload, 'text/xml');\nconsole.timeEnd('parse');\n```\n\nMeasured (Node 18) — time quadruples per doubling of the whitespace run (canonical O(n²)):\n\n| Whitespace run | Isolated regex | End-to-end `parseFromString` (0.8.13) |\n|---|---|---|\n|  4 KB | 5.6 ms   | 5.7 ms   |\n|  8 KB | 22.7 ms  | 22.5 ms  |\n| 16 KB | 88.6 ms  | 92 ms    |\n| 32 KB | 354 ms   | 361 ms   |\n| 64 KB | 1434 ms  | 1452 ms  |\n| 128 KB | 5761 ms | —        |\n\n## Impact\n\nAvailability only: a single parse of a small crafted document blocks the Node.js event loop for the\nduration of the quadratic scan (≈1.4 s at 64 KB; multi-second with larger inputs). No memory\nblow-up, no data exposure, no integrity impact. Because XML is routinely accepted from untrusted\nsources and parsed with default options, one request can stall a server.\n\n## Affected Versions\n\nAffected on the `0.7.x` and `0.8.x` lines (the trailing-whitespace trim was added in `0.7.0`, present\nthrough `0.8.14`); the fix targets the `0.8.x` LTS patch. The `0.9.x` line rewrote end-tag parsing to\nan anchored linear matcher and never had this regex, so it is **not** affected. No published unscoped\n`xmldom` is affected — the vulnerable code exists only in a `0.7.0` git tag that was never released to\nnpm (`npm view xmldom` → `latest` = 0.6.0).\n\n## Fix Applied\n\nAnchors the end-tag trailing-whitespace trim so it runs in linear time instead of\nbacktracking quadratically on a long whitespace run. Byte-identical output. Non-breaking; 0.8.x-only.\n\n## Severity note\n\nThe complexity is **quadratic**, not exponential, so a multi-second stall requires\ntens-to-hundreds of KB of input. `VA:H` reflects that xmldom applies **no input-size limit** and the\npath runs on default-options parsing, so a single unbounded parse can fully stall the event loop.","status":"published","published":"2026-09-08T21:01:09Z","modified":"2026-09-08T21:15:04.998562447Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-1333","CWE-400"],"updated_at":"2026-11-02T15:46:59.484835Z"},{"id":"UBUNTU-CVE-2026-83619","description":"xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. From 0.7.0 until 0.8.15, the release-0.8.x parser in lib/sax.js trims captured end-tag names with the unanchored global expression /[ \\t\\n\\r]+$/g. For an end tag containing a long whitespace run followed by a non-whitespace character, the expression retries from each possible starting position and backtracks quadratically before failing its end anchor. DOMParser.parseFromString() reaches the path under default options, allowing a small unauthenticated XML input to stall the Node.js event loop; the 0.9.x and unscoped npm lines do not contain this expression. This issue is fixed in @xmldom/xmldom version 0.8.15.","status":"published","published":"2026-09-01T15:17:00Z","modified":"2026-09-16T14:03:32.031246456Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T16:57:22.213888Z"},{"id":"AZL-99336","title":"CVE-2026-83619 affecting package python-tensorboard 2.16.2-6","description":"xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. From 0.7.0 until 0.8.15, the release-0.8.x parser in lib/sax.js trims captured end-tag names with the unanchored global expression /[ \\t\\n\\r]+$/g. For an end tag containing a long whitespace run followed by a non-whitespace character, the expression retries from each possible starting position and backtracks quadratically before failing its end anchor. DOMParser.parseFromString() reaches the path under default options, allowing a small unauthenticated XML input to stall the Node.js event loop; the 0.9.x and unscoped npm lines do not contain this expression. This issue is fixed in @xmldom/xmldom version 0.8.15.","status":"published","published":"2026-09-01T15:17:40Z","modified":"2026-09-08T05:27:28Z","updated_at":"2026-11-02T15:28:12.596039Z"},{"id":"CLSA-2026-1790755546","title":"TuxCare security update for @xmldom/xmldom (14 CVEs)","description":"TuxCare rebuilt @xmldom/xmldom to address 14 CVEs. Fixed in 0.7.13-tuxcare.1.","status":"published","published":"2026-09-30T08:05:46Z","modified":"2026-10-15T09:47:53.549832566Z","updated_at":"2026-11-02T15:43:48.65893Z"}]}}