{"id":"GHSA-mcm9-63f2-9j32","revision":null,"records":[{"revision":"fbd8c460f46f42018889d4b5dfea6e99","observedAt":"2026-11-10T19:21:22.605+00:00","statement":{"source":"cve-program","id":"CVE-2026-123565","aliases":[],"title":"Devalue before 5.9.3 Quadratic Expansion Denial of Service via uneval","description":"Sveltejs devalue before 5.9.3 contains a resource exhaustion vulnerability where repeated primitive strings cause quadratic expansion in the uneval function. Attackers can supply a small crafted payload that is parsed and then passed to uneval, producing a very large serialized string that exhausts memory or CPU.","state":0,"publishedAt":"2026-11-08T01:38:04.469+00:00","modifiedAt":"2026-11-10T17:58:28.362+00:00","affected":[{"ecosystem":"Vendor product","name":"devalue","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"sveltejs\",\n                    \"product\": \"devalue\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"packageURL\": \"pkg:npm/devalue\",\n                    \"versions\": [\n                        {\n                            \"version\": \"0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\",\n                            \"lessThan\": \"5.9.3\"\n                        },\n                        {\n                            \"version\": \"5.9.3\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","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","score":8.7,"severity":"HIGH"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://github.com/sveltejs/devalue/security/advisories/GHSA-mcm9-63f2-9j32","https://www.vulncheck.com/advisories/devalue-before-5.9.3-quadratic-expansion-denial-of-service-via-uneval"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-123565","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-123565","identifiers":["CVE-2026-123565"]},"retained":false,"historicalAffected":[]},{"revision":"482cbbe77c8b4913960ff72ca590ec0d","observedAt":"2026-11-14T11:58:31.689+00:00","statement":{"source":"euvd","id":"EUVD-2026-119450","aliases":["CVE-2026-123565","GHSA-m5fj-453c-wwq4"],"title":"Sveltejs devalue before 5.9.3 contains a resource exhaustion vulnerability where repeated primitive strings cause quadratic expansion in the uneval function. Attackers can supply a small crafted payload that is parsed and then passed to une…","description":"Sveltejs devalue before 5.9.3 contains a resource exhaustion vulnerability where repeated primitive strings cause quadratic expansion in the uneval function. Attackers can supply a small crafted payload that is parsed and then passed to uneval, producing a very large serialized string that exhausts memory or CPU.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 4.0","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","score":8.7,"severity":null}],"references":["https://github.com/sveltejs/devalue/security/advisories/GHSA-mcm9-63f2-9j32","https://www.vulncheck.com/advisories/devalue-before-5.9.3-quadratic-expansion-denial-of-service-via-uneval"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-119450","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Nov 8, 2026, 1:38:04 AM","dateUpdated":"Nov 10, 2026, 5:58:28 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-119450","identifiers":["EUVD-2026-119450","CVE-2026-123565","GHSA-m5fj-453c-wwq4"]},"retained":false,"historicalAffected":[]},{"revision":"683391d6e19246b2bec3ce3922d887dc","observedAt":"2026-11-14T12:57:57.313+00:00","statement":{"source":"nvd","id":"CVE-2026-123565","aliases":[],"title":"Sveltejs devalue before 5.9.3 contains a resource exhaustion vulnerability where repeated primitive strings cause quadratic expansion in the uneval function. Attackers can supply a small crafted payload that is parsed and then passed to une…","description":"Sveltejs devalue before 5.9.3 contains a resource exhaustion vulnerability where repeated primitive strings cause quadratic expansion in the uneval function. Attackers can supply a small crafted payload that is parsed and then passed to uneval, producing a very large serialized string that exhausts memory or CPU.","state":0,"publishedAt":"2026-11-08T02:16:49.04+00:00","modifiedAt":"2026-11-12T20:28:31.817+00:00","affected":[],"metrics":[{"system":"CVSS 4.0 · disclosure@vulncheck.com · Secondary","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","score":8.7,"severity":"HIGH"},{"system":"CVSS 3.1 · disclosure@vulncheck.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://github.com/sveltejs/devalue/security/advisories/GHSA-mcm9-63f2-9j32","https://www.vulncheck.com/advisories/devalue-before-5.9.3-quadratic-expansion-denial-of-service-via-uneval"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-123565","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Awaiting Analysis","weaknesses":["CWE-400"],"productCriteria":[],"sourceDates":{"published":"2026-11-08T02:16:49.040","lastModified":"2026-11-12T20:28:31.817"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-123565","identifiers":["CVE-2026-123565"]},"retained":false,"historicalAffected":[]},{"revision":"272dec67094846ee8dc26bb582ca3cc6","observedAt":"2026-11-08T11:04:43.384+00:00","statement":{"source":"osv","id":"GHSA-mcm9-63f2-9j32","aliases":["CVE-2026-123565"],"title":"devalue: Repeated primitive strings cause quadratic expansion in uneval","description":"Under very constrained circumstances, data that was `parse`d and then passed to `uneval` could turn a small payload into a very large serialized string.","state":0,"publishedAt":"2026-10-01T15:17:29+00:00","modifiedAt":"2026-11-08T10:56:13.2921917+00:00","affected":[{"ecosystem":"npm","name":"devalue","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"5.9.3"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V4","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/sveltejs/devalue/security/advisories/GHSA-mcm9-63f2-9j32","https://github.com/sveltejs/devalue/commit/84f6f67999104e36940f744bec0443536de1b463","https://github.com/sveltejs/devalue","https://github.com/sveltejs/devalue/releases/tag/v5.9.3"],"sourceUrl":"https://github.com/advisories/GHSA-mcm9-63f2-9j32","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-mcm9-63f2-9j32","identifiers":["GHSA-mcm9-63f2-9j32","CVE-2026-123565"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. Missing entries do not establish absence of exploitation.","generation":"2026-11-15T23:06:17.8993558+00:00","complete":true,"records":1781,"lastAttemptAt":"2026-11-15T23:06:17.8993558+00:00","lastSuccessAt":"2026-11-15T23:06:18.1032742+00:00","error":null,"lastVerifiedAt":"2026-11-15T23:06:18.1032749+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"cve-program","scope":"Official CVE Program baseline and cumulative hourly delta; all vendors, published and rejected records","generation":"cve-7de4d7559a5263003f03d9f70577ab06f92ba4178309f26fce53e22a4a959294-39ebbce2db83696403d232c43a03ba55a47d1e19101fb621bbb1e57f01bae099","complete":true,"records":425869,"lastAttemptAt":"2026-11-15T23:06:17.3240958+00:00","lastSuccessAt":"2026-11-15T23:06:17.2976675+00:00","error":null,"lastVerifiedAt":"2026-11-15T23:06:17.3240958+00:00","snapshotPublishedAt":"2026-11-15T22:27:42+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"euvd","scope":"Rolling EUVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-1f00a6164e4d4eb5b570181d2d48c31d","complete":false,"records":13821,"lastAttemptAt":"2026-11-15T23:16:09.5280366+00:00","lastSuccessAt":"2026-11-15T23:16:09.517+00:00","error":"50 identifier lookups failed; latest failures include AccessDenied (HTTP 403). Other identifiers were checked independently.","lastVerifiedAt":"2026-11-15T23:16:09.517+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13688,"expectedIdentifiers":13874,"failedIdentifiers":50},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-15T23:06:17.8993558+00:00","complete":true,"records":1125,"lastAttemptAt":"2026-11-15T23:06:17.8993558+00:00","lastSuccessAt":"2026-11-15T23:06:18.1046693+00:00","error":null,"lastVerifiedAt":"2026-11-15T23:06:18.1046697+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-41e8388e19074c0d9ced98f4bd388802","complete":true,"records":13833,"lastAttemptAt":"2026-11-15T23:07:00.0091971+00:00","lastSuccessAt":"2026-11-15T23:07:00.006+00:00","error":null,"lastVerifiedAt":"2026-11-15T23:07:00.006+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13874,"expectedIdentifiers":13874,"failedIdentifiers":0},{"source":"osv:Go","scope":"Complete OSV Go ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"go-64eea06dbd27de8464d5dbce1b78cc794cc59e2d901516ae0d3ea76e624cdae0","complete":true,"records":9955,"lastAttemptAt":"2026-11-15T23:06:17.7078343+00:00","lastSuccessAt":"2026-11-14T13:57:23.1208135+00:00","error":null,"lastVerifiedAt":"2026-11-15T23:06:17.7078343+00:00","snapshotPublishedAt":"2026-11-14T13:17:57+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:NuGet","scope":"Complete OSV NuGet ecosystem archive, including GitHub Advisory Database records; NuGet version matching only","generation":"nuget-f4424d7d4861b1af1404bd15abcb83f295dcd003412a9340ca99dc8200aa148a","complete":true,"records":2014,"lastAttemptAt":"2026-11-15T23:06:17.4961704+00:00","lastSuccessAt":"2026-11-13T19:57:08.2864435+00:00","error":null,"lastVerifiedAt":"2026-11-15T23:06:17.4961704+00:00","snapshotPublishedAt":"2026-11-13T19:33:10+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:crates.io","scope":"Complete OSV crates.io ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"crates.io-6086d649bcb454cdf302d7d9275177bda73550e1b6e446b3520e9b6266d3582c","complete":true,"records":3148,"lastAttemptAt":"2026-11-15T23:06:17.8235923+00:00","lastSuccessAt":"2026-11-15T11:05:17.1034234+00:00","error":null,"lastVerifiedAt":"2026-11-15T23:06:17.8235923+00:00","snapshotPublishedAt":"2026-11-15T10:03:04+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:npm","scope":"Complete OSV npm ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"npm-ff18f36f13fcca3a20a3fb9274b59b8872d18869a99071730e1e79b625c8f612","complete":true,"records":232475,"lastAttemptAt":"2026-11-15T23:06:17.6038079+00:00","lastSuccessAt":"2026-11-15T11:05:10.4195883+00:00","error":null,"lastVerifiedAt":"2026-11-15T23:06:17.6038079+00:00","snapshotPublishedAt":"2026-11-15T10:33:06+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null}]}