CVE-2026-107215
Excelize: extractPart allocates attacker-controlled, unbounded and negative-sized buffers from CFB directory entries: remote panic / OOM DoS
Impact
Excelize is a Go language library for reading and writing Microsoft Excel spreadsheets. From 2.3.1 to 2.11.0, extractPart allocates a byte slice directly from an attacker-controlled CFB directory-entry size before validating the sector chain or size domain. extractPart trusts the CFB directory entry streamSize for EncryptionInfo and EncryptedPackage allocations before validating the stream. When a crafted OLE compound file declares a negative or extremely large EncryptionInfo or EncryptedPackage stream size, the declared size reaches make with a negative length or forces a multi-gigabyte allocation, allowing an attacker to panic or exhaust process memory. No fixed version is available as of this review.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/xuri/excelize/v2 | >= 2.3.1, < 2.11.1-0.20260912113515-5f636f9dcde5 | 2.11.1-0.20260912113515-5f636f9dcde5 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Excelize | Excelize | from 2.3.1 through 2.11.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-x2q3-8cjh-766f
- https://github.com/qax-os/excelize/security/advisories/GHSA-x2q3-8cjh-766f
- https://nvd.nist.gov/vuln/detail/CVE-2026-107215
- https://github.com/qax-os/excelize/pull/2396
- https://github.com/qax-os/excelize/commit/5f636f9dcde55911f14290060b017f0cc88cd694