CVE-2026-128338
Last modified
CVE-2026-128338 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. exceljs through 4.4.0 contains a memory exhaustion vulnerability that allows attackers to crash applications by supplying a worksheet col element with an unbounded max attribute. Attackers can craft a small workbook with a huge max value, causing xlsx.load() to allocate hundreds of millions of Column objects and abort the process with an uncatchable heap out-of-memory error.. EPSS estimates a 0.63% chance of exploitation in the next 30 days.
Description
exceljs through 4.4.0 contains a memory exhaustion vulnerability that allows attackers to crash applications by supplying a worksheet col element with an unbounded max attribute. Attackers can craft a small workbook with a huge max value, causing xlsx.load() to allocate hundreds of millions of Column objects and abort the process with an uncatchable heap out-of-memory error.
Metrics
Weakness Enumeration
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| exceljs | exceljs | <= 4.4.0 |
References
Timeline
- Published
- Last Modified
- Status
- Awaiting Analysis
Frequently Asked Questions
What is CVE-2026-128338?
How severe is CVE-2026-128338?
How do I fix CVE-2026-128338?
How Strix Helps
- 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.
Related CVEs from 2026
- CVE-2026-128332Listmonk 6.0.0 before 7.0.0-beta.2 contains a 2FA bypass vul…7.4
- CVE-2026-128333listmonk 6.0.0 before 7.0.0-beta.2 contains an authenticatio…7.4
- CVE-2026-128334listmonk 6.2.0 before 7.0.0-beta.2 contains a missing authen…4.8
- CVE-2026-128335Contao 4.6.0 before 5.3.54, 5.4.0-RC1 before 5.7.17, and 6.0…3.7
- CVE-2026-128336ExcelJS through 4.4.0 contains a prototype pollution vulnera…4.8
- CVE-2026-128337ExcelJS through 4.4.0 contains a prototype pollution vulnera…7
- CVE-2026-128339ExcelJS through 4.4.0 contains a memory exhaustion vulnerabi…7.5
- CVE-2026-128340ExcelJS through 4.4.0 contains a memory exhaustion vulnerabi…7.5
- CVE-2026-128341ExcelJS through 4.4.0 contains a resource exhaustion vulnera…7.5
- CVE-2026-128342ExcelJS through 4.4.0 contains a denial of service vulnerabi…7.5
- CVE-2026-128343exceljs through 4.4.0 contains a denial of service vulnerabi…7.5
- CVE-2026-128344ExcelJS through 4.4.0 contains a memory exhaustion vulnerabi…7.5
Are you affected by CVE-2026-128338?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST