Excelize: Unbounded spinCount in agile decryption burns CPU during OpenFile

[ Description ]Official description

Excelize is a Go language library for reading and writing Microsoft Excel spreadsheets. From 2.3.1 to 2.11.0, agile decryption accepts an attacker-controlled spinCount and performs that many password-key derivation iterations before verifier validation. OpenFile reaches agileDecrypt, which passes the unbounded spinCount to convertPasswdToKey before password verification. When a crafted OLE encrypted-workbook header supplies an excessive spinCount and the file is opened, the key-derivation loop performs unbounded attacker-selected work and cannot be cancelled, allowing an attacker to consume a CPU core for an attacker-controlled duration. No fixed version is available as of this review.

[ Fixes ]Fixes and patches

• github.com/xuri/excelize/v2 2.11.1-0.20260906004932-2badfcd5841dFixed version · GitHub Advisories · go package github.com/xuri/excelize/v2: upgrade to 2.11.1-0.20260906004932-2badfcd5841d or later (affected >= 2.3.1, < 2.11.1-0.20260906004932-2badfcd5841d)
• Patch on github.comVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD
• Patch on github.comVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD

[ Packages ]Affected open-source packages

• github.com/xuri/excelize/v2 goAffected >= 2.3.1, < 2.11.1-0.20260906004932-2badfcd5841d · fixed in 2.11.1-0.20260906004932-2badfcd5841d · GHSA-jrfj-fhj2-jjvm

[ References ]References

• github.com/qax-os/excelize/commit/2badfcd5841d0d88b0ffea119f5a2f3c53b4910bPatch
• github.com/qax-os/excelize/pull/2389Issue TrackingPatch
• github.com/qax-os/excelize/security/advisories/GHSA-jrfj-fhj2-jjvmExploitVendor Advisory