CVE-2023-34188
highpriority · track · 30EPSS 0.010 · 63 %ileEUUSEPSS · scored 2026-10-27
The HTTP server in Mongoose before 7.10 accepts requests containing negative Content-Length headers. By sending a single attack payload over TCP, an attacker can cause an infinite loop in which the server continuously reparses that payload, and does not respond to any other requests.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.9–7.5
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (2)
Products and version ranges known to be affected.
also known as (3)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (14)
External citations — patches, advisories, analysis.
- https://blog.narfindustries.com/blog/narf-discovers-critical-vulnerabilities-in-cesanta-mongoose-cnnvd
- https://cxsecurity.com/cveshow/CVE-2023-34188/cnnvd
- https://github.com/cesanta/mongoose/commit/4663090a8fb036146dfe77718cff612b0101cb0fcnnvd
- https://github.com/cesanta/mongoose/compare/7.9...7.10cnnvd
- https://github.com/cesanta/mongoose/pull/2197cnnvd
- https://blog.narfindustries.com/blog/narf-discovers-critical-vulnerabilities-in-cesanta-mongoose-http-serverenisa_euvd
- https://github.com/cesanta/mongoose/commit/4663090a8fb036146dfe77718cff612b0101cb0fenisa_euvd
- https://github.com/cesanta/mongoose/compare/7.9...7.10enisa_euvd
Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.
Free scan