CVE-2026-107218

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.

CVSS v3 5.3 MEDIUM

5.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact LOW

Scope UNCHANGED

References

Link	Resource
https://github.com/qax-os/excelize/commit/ecd99d761fe0489f1ed308e2f7dc2e0502d1a396	Patch
https://github.com/qax-os/excelize/pull/2390	Issue Tracking Patch
https://github.com/qax-os/excelize/security/advisories/GHSA-8jjq-8j9w-m2v6	Exploit Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:excelize:excelize:*:*:*:*:*:go:*:*

History

13 Oct 2026, 14:23

Type	Values Removed	Values Added
First Time		Excelize excelize Excelize
References	~~() https://github.com/qax-os/excelize/commit/ecd99d761fe0489f1ed308e2f7dc2e0502d1a396 -~~	() https://github.com/qax-os/excelize/commit/ecd99d761fe0489f1ed308e2f7dc2e0502d1a396 - Patch
References	~~() https://github.com/qax-os/excelize/pull/2390 -~~	() https://github.com/qax-os/excelize/pull/2390 - Issue Tracking, Patch
References	~~() https://github.com/qax-os/excelize/security/advisories/GHSA-8jjq-8j9w-m2v6 -~~	() https://github.com/qax-os/excelize/security/advisories/GHSA-8jjq-8j9w-m2v6 - Exploit, Vendor Advisory
CPE		cpe:2.3:a:excelize:excelize::::::go::*

07 Oct 2026, 19:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-07 19:17

Updated : 2026-10-13 14:23

NVD link : CVE-2026-107218

Mitre link : CVE-2026-107218

CVE.ORG link : CVE-2026-107218

JSON object : View

Products Affected

excelize

excelize

CWE

CWE-129

Improper Validation of Array Index

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