{"id":"GHSA-jrfj-fhj2-jjvm","revision":"133a6e1f98ae467c9a827d3e81bd3778","records":[{"revision":"133a6e1f98ae467c9a827d3e81bd3778","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-jrfj-fhj2-jjvm","aliases":["CVE-2026-107219"],"title":"Excelize: Unbounded spinCount in agile decryption burns CPU during OpenFile","description":"Opening a file whose first eight bytes are the OLE magic number sends excelize down the decryption path whether or not the caller set a password, or supports encrypted workbooks at all. `openReaderAt` (excelize.go:198-215) branches on the header alone, and `agileDecrypt` calls `convertPasswdToKey` before the verifier hash is checked, so the key-derivation loop runs `spinCount` times regardless.\n\n`spinCount` (crypt.go:98) is a plain `int` filled by a bare `xml.Unmarshal` of the file's own EncryptionInfo stream. Nothing bounds it.\n\nA 3072-byte file with spinCount 100000000 makes `OpenFile` take 58.65s on v2.11.0 with default options, then return `zip: not a valid zip file`. It is linear at about 0.6 microseconds per iteration and the attacker picks the number, so 1e9 is roughly ten minutes. Nothing on the path takes a `context.Context`, so the caller cannot cancel it; in an HTTP handler the write timeout returns a response while the goroutine keeps spinning. Memory stays flat at 24 MB, so nothing reclaims it either.\n\n```\nv2.5.0   spinCount=10000000   5.307s\nv2.9.1   spinCount=10000000   5.444s\nv2.11.0  spinCount=10000000   7.529s\nv2.11.0  spinCount=100000000  58.654s\n```\n\nThe loop arrived with `crypt.go` in v2.3.1 and is unchanged through v2.11.0.\n\nExcel and LibreOffice write spinCount 100000, which costs 61ms here, so a ceiling well above the legitimate value would cost real files nothing. \n\nThis is availability only, and it is not a vulnerability for a program that only opens files its own operator produced.","state":0,"publishedAt":"2026-10-07T20:23:22+00:00","modifiedAt":"2026-10-07T20:30:05.8328099+00:00","affected":[{"ecosystem":"Go","name":"github.com/xuri/excelize/v2","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"2.3.1"},{"kind":"fixed","version":"2.11.1-0.20260906004932-2badfcd5841d"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/qax-os/excelize/security/advisories/GHSA-jrfj-fhj2-jjvm","https://github.com/qax-os/excelize/pull/2389","https://github.com/qax-os/excelize/commit/2badfcd5841d0d88b0ffea119f5a2f3c53b4910b","https://github.com/qax-os/excelize"],"sourceUrl":"https://github.com/advisories/GHSA-jrfj-fhj2-jjvm","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-jrfj-fhj2-jjvm","identifiers":["GHSA-jrfj-fhj2-jjvm","CVE-2026-107219"]},"retained":false,"historicalAffected":[]}],"coverage":[]}