Excelize: GetStyle panics on a negative fillId, borderId or fontId in styles.xml

[ Why it matters ]Priority signals

• Public proof-of-concept exploit exists (CISA SSVC)

[ Description ]Official description

Excelize is a Go language library for reading and writing Microsoft Excel spreadsheets. From 2.8.0 to 2.11.0, GetStyle's fill, border, and font extraction predicates check only upper bounds for attacker-controlled style-table indices. File.GetStyle relies on extractStyleCondFuncs predicates that allow negative FillID, BorderID, and FontID values to reach slice indexing. When a crafted styles.xml supplies a negative fillId, borderId, or fontId and the application reads the style, a negative identifier passes the upper-bound-only predicate and becomes a negative slice index, allowing an attacker to panic while reading cell styling. No fixed version is available as of this review.

[ Fixes ]Fixes and patches

• github.com/xuri/excelize/v2 2.11.1-0.20260731010303-ae2113b410e5Fixed version · GitHub Advisories · go package github.com/xuri/excelize/v2: upgrade to 2.11.1-0.20260731010303-ae2113b410e5 or later (affected >= 2.8.0, < 2.11.1-0.20260731010303-ae2113b410e5)
• 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 >= 2.8.0, < 2.11.1-0.20260731010303-ae2113b410e5 · fixed in 2.11.1-0.20260731010303-ae2113b410e5 · GHSA-5h23-36rv-pm65

[ References ]References

• github.com/qax-os/excelize/commit/ae2113b410e51f6a141c396a59eda8c42b91bc22Patch
• github.com/qax-os/excelize/pull/2367Issue TrackingPatch
• github.com/qax-os/excelize/security/advisories/GHSA-5h23-36rv-pm65ExploitVendor Advisory