Excelize: Panic in cellInRange on a worksheet with an empty mergeCell ref

[ 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 2.7.1 to 2.11.0, mergeCellsParser leaves the cached rectangle empty for an empty mergeCell ref and then passes that empty slice to cellInRange without a length check. GetCellValue reaches mergeCellsParser, which passes an empty rectangle derived from the mergeCell ref attribute into cellInRange. When a crafted worksheet contains an empty mergeCell ref and a non-streaming cell API reads the worksheet, cellInRange indexes four positions in an empty slice, allowing an attacker to panic on the first affected cell operation. No fixed version is available as of this review.

[ Fixes ]Fixes and patches

• github.com/xuri/excelize/v2 2.11.1-0.20260820023833-99903a3240e5Fixed version · GitHub Advisories · go package github.com/xuri/excelize/v2: upgrade to 2.11.1-0.20260820023833-99903a3240e5 or later (affected >= 2.7.1, < 2.11.1-0.20260820023833-99903a3240e5)
• 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 >= 2.7.1, < 2.11.1-0.20260820023833-99903a3240e5 · fixed in 2.11.1-0.20260820023833-99903a3240e5 · GHSA-g27h-8qhm-6pff

[ References ]References

• github.com/qax-os/excelize/commit/99903a3240e58a47ff28fb8e05a03bd9d496ec24Patch
• github.com/qax-os/excelize/pull/2379Issue TrackingPatch
• github.com/qax-os/excelize/security/advisories/GHSA-g27h-8qhm-6pffExploitVendor Advisory