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CVE-2026-107218

5.3 · MEDIUM

Excelize is a Go language library for reading and writing Microsoft Excel spreadsheets.

Published Oct 7, 2026excelizeCWE-129EPSS 0.31%

Overview

CVE-2026-107218 is a medium-severity vulnerability affecting excelize excelize. It was published on October 7, 2026 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Excelize is a Go language library for reading and writing Microsoft Excel spreadsheets. From 2.10.1 to 2.11.0, RIGHT validates the requested length with UTF-16 code-unit counts but slices a rune array using Unicode code-point counts. RIGHT reaches leftRight through CalcCellValue, where countUTF16String validates one unit but utf8.RuneCountInString supplies the slice index in another. When RIGHT evaluates supplementary-plane text with a requested character count between the rune count and UTF-16 code-unit count, the inconsistent units produce a negative rune-slice index, allowing an attacker to panic during formula evaluation. No fixed version is available as of this review.

Remediation

Check the references section for vendor advisories and patches from excelize. Update excelize to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
excelizeexcelize2.10.1Affected

References

GitHubgithub.com/qax-os/excelize/commit/ecd99d761fe0489f1ed308e2f7dc2e0502d1a396GitHubgithub.com/qax-os/excelize/pull/2390GitHubgithub.com/qax-os/excelize/security/advisories/GHSA-8jjq-8j9w-m2v6

How CyberStrike helps

Frequently asked questions

What is CVE-2026-107218?

CVE-2026-107218 is a medium-severity vulnerability affecting excelize excelize. It was published on October 7, 2026 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2026-107218?

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-107218?

Check the references section for vendor advisories and patches from excelize. Update excelize to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-107218?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-107218 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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