CVE-2026-107215
Excelize: extractPart allocates attacker-controlled, unbounded and negative-sized buffers from CFB directory entries: remote panic / OOM DoS
Description
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.
INFO
Published Date :
Oct. 7, 2026, 6:17 p.m.
Last Modified :
Oct. 13, 2026, 2:23 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | MITRE-CVE | ||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update the Excelize library to a patched version.
- Validate file sizes before allocation.
- Implement bounds checking for file sizes.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-107215.
| URL | Resource |
|---|---|
| https://github.com/qax-os/excelize/commit/5f636f9dcde55911f14290060b017f0cc88cd694 | Patch |
| https://github.com/qax-os/excelize/pull/2396 | Issue Tracking Patch |
| https://github.com/qax-os/excelize/security/advisories/GHSA-x2q3-8cjh-766f | Exploit Vendor Advisory |
| https://github.com/qax-os/excelize/security/advisories/GHSA-x2q3-8cjh-766f | Exploit Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-107215 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-107215
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-107215 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-107215 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Oct. 13, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:excelize:excelize:*:*:*:*:*:go:*:* versions from (including) 2.3.1 up to (including) 2.11.0 Added Reference Type GitHub, Inc.: https://github.com/qax-os/excelize/commit/5f636f9dcde55911f14290060b017f0cc88cd694 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/qax-os/excelize/pull/2396 Types: Issue Tracking, Patch Added Reference Type CISA-ADP: https://github.com/qax-os/excelize/security/advisories/GHSA-x2q3-8cjh-766f Types: Exploit, Vendor Advisory Added Reference Type GitHub, Inc.: https://github.com/qax-os/excelize/security/advisories/GHSA-x2q3-8cjh-766f Types: Exploit, Vendor Advisory Changed Reference Type nvd-ai-agent-0.4.0-gemma-4-31B-it: https://github.com/qax-os/excelize/pull/2396 Types: Patch, Vendor Advisory nvd-ai-agent-0.4.0-gemma-4-31B-it: https://github.com/qax-os/excelize/pull/2396 Types: Issue Tracking, Patch, Patch, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Oct. 10, 2026
Action Type Old Value New Value Added Reference https://github.com/qax-os/excelize/security/advisories/GHSA-x2q3-8cjh-766f Added SSVC {'id': 'CVE-2026-107215', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-10-10T02:38:08.709822Z'} -
New CVE Received by [email protected]
Oct. 07, 2026
Action Type Old Value New Value Added Description 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-789 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/107xxx/CVE-2026-107215.json">CVE-2026-107215</a> Added Reference https://github.com/qax-os/excelize/commit/5f636f9dcde55911f14290060b017f0cc88cd694 Added Reference https://github.com/qax-os/excelize/pull/2396 Added Reference https://github.com/qax-os/excelize/security/advisories/GHSA-x2q3-8cjh-766f