Vulnerability · Published Oct 7, 2026 · Assigned by GitHub_M

CVE-2026-107225Excelize: GetStyle panics on a negative fillId, borderId or fontId in styles.xml

Medium 6.5

In plain English

A medium-severity improper input validation in excelize from qax-os. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 19% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.3%top 80.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/xuri/excelize/v2	2.11.1-0.20260731010303-ae2113b410e5	GHSA-5h23-36rv-pm65
Go	github.com/xuri/excelize/v2	2.11.1-0.20260731010303-ae2113b410e5	GO-2026-6674

Affected products (as reported)

Vendor	Product	Versions
qax-os	excelize	>= 2.8.0, <= 2.11.0

Weakness: CWE-20, CWE-129 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

References

https://github.com/qax-os/excelize/security/advisories/GHSA-5h23-36rv-pm65 x_refsource_CONFIRM
https://github.com/qax-os/excelize/pull/2367 x_refsource_MISC
https://github.com/qax-os/excelize/commit/ae2113b410e51f6a141c396a59eda8c42b91bc22 x_refsource_MISC