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.

• CWE-129

• https://github.com/qax-os/excelize/commit/ecd99d761fe0489f1ed308e2f7dc2e0502d1a396
• https://github.com/qax-os/excelize/pull/2390
• https://github.com/qax-os/excelize/security/advisories/GHSA-8jjq-8j9w-m2v6

Published

Oct 7, 2026

Last Modified

Oct 7, 2026

Status

Received

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-107212Excelize is a Go language library for reading and writing Mi…7.5
• CVE-2026-107213Excelize is a Go language library for reading and writing Mi…8.7
• CVE-2026-107214Excelize is a Go language library for reading and writing Mi…7.5
• CVE-2026-107215Excelize is a Go language library for reading and writing Mi…7.5
• CVE-2026-107216Excelize is a Go language library for reading and writing Mi…7.5
• CVE-2026-107217Excelize is a Go language library for reading and writing Mi…7.5
• CVE-2026-107219Excelize is a Go language library for reading and writing Mi…7.5
• CVE-2026-10722A vulnerability has been found in cilium ebpf up to 0.21.0. …5.5
• CVE-2026-107220Excelize is a Go language library for reading and writing Mi…6.5
• CVE-2026-107221Excelize is a Go language library for reading and writing Mi…6.5
• CVE-2026-107222Excelize is a Go language library for reading and writing Mi…6.5
• CVE-2026-107223Excelize is a Go language library for reading and writing Mi…7.1