CVE-2026-59162: excelize — Exploit & Fix

Description

Excelize is a Go language library for reading and writing Microsoft Excel spreadsheets. Prior to 2.11.0, Excelize parses shared-string cell values with strconv.Atoi and checks only the upper bound before indexing the shared string slice, allowing an XLSX file containing a shared-string cell with -1 to trigger sharedStrings[-1] and panic when read through GetCellValue or GetRows. This issue is fixed in version 2.11.0.

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CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS — Exploit Prediction

0.0039

Probability of exploitation

0.32%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-248 CWE-248

CWE-755 CWE-755

Affected Products

Vendor	Product	Versions
excelize	excelize	< 2.11.0

References

Advisories & Patches

https://github.com/qax-os/excelize/commit/93f0b3caed37f21ef5079e3259c6c21dcfe68453 https://github.com/qax-os/excelize/pull/2331 https://github.com/qax-os/excelize/security/advisories/GHSA-fx5j-qcqg-grpf https://github.com/qax-os/excelize/security/advisories/GHSA-fx5j-qcqg-grpf

Exploits

https://github.com/qax-os/excelize/security/advisories/GHSA-fx5j-qcqg-grpf https://github.com/qax-os/excelize/security/advisories/GHSA-fx5j-qcqg-grpf

Other References

https://github.com/qax-os/excelize/releases/tag/v2.11.0

Frequently Asked Questions

What is CVE-2026-59162? +

Excelize is a Go language library for reading and writing Microsoft Excel spreadsheets. Prior to 2.11.0, Excelize parses shared-string cell values with strconv.Atoi and checks only the upper bound before indexing the shared string slice, allowing an XLSX file containing a shared-string cell with -1 to trigger sharedStrings[-1] and panic when read through GetCellValue or GetRows. This issue is fixed in version 2.11.0. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-59162? +

CVE-2026-59162 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0039, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-59162? +

CVE-2026-59162 affects products from excelize, specifically: excelize. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-59162? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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