What’s Vulnerable › Vulnerabilities

CVE-2026-107219: Excelize: Unbounded spinCount in agile decryption burns CPU during OpenFile

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-10-07 · updated 2026-10-13
• Weakness: CWE-400

Description

Excelize is a Go language library for reading and writing Microsoft Excel spreadsheets. From 2.3.1 to 2.11.0, agile decryption accepts an attacker-controlled spinCount and performs that many password-key derivation iterations before verifier validation. OpenFile reaches agileDecrypt, which passes the unbounded spinCount to convertPasswdToKey before password verification. When a crafted OLE encrypted-workbook header supplies an excessive spinCount and the file is opened, the key-derivation loop performs unbounded attacker-selected work and cannot be cancelled, allowing an attacker to consume a CPU core for an attacker-controlled duration. No fixed version is available as of this review.

Affected products

• qax-os excelize: from 2.3.1 through 2.11.0

References

• https://github.com/qax-os/excelize/commit/2badfcd5841d0d88b0ffea119f5a2f3c53b4910b
• https://github.com/qax-os/excelize/pull/2389
• https://github.com/qax-os/excelize/security/advisories/GHSA-jrfj-fhj2-jjvm

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