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CVE-2026-121727Kore before 4.3.0 Integer Underflow Memory Exhaustion via http_header_recv()
Kore before 4.3.0 contains an integer underflow vulnerability in HTTP request body handling that allows unauthenticated attackers to bypass http_body_max by sending more body bytes than declared. Attackers can send oversized first segments over many concurrent POST, PUT or DELETE connections, wrapping content_length to grow buffers unbounded and exhaust worker memory.
8.7 HIGHEPSS 0.38%Not in KEVNVD: Received
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 8.7 | HIGH | 4.0VulnCheck (CNA) | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N |
| 7.5 | HIGH | 3.1VulnCheck (CNA) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Details
- CVE ID
- CVE-2026-121727
- Status
- Received
- Assigner (CNA)
- VulnCheck
- Published
- Nov 3, 2026
- Last modified
- 2026-11-03 23:17 UTC
- Weaknesses
- CWE-191 · Integer Underflow (Wrap or Wraparound)
Affected Products
As published by the CNA in the CVE record.
jorisvinkkore1 version range
- before 4.3.0
References
- github.com https://github.com/jorisvink/kore
- github.com https://github.com/jorisvink/kore/blob/4.3.0-rc5/src/http.c#L934
- github.com https://github.com/jorisvink/kore/commit/1ff3c0f6f7973dc7fc8bf38369790ef2d8079b3b
- kore.io https://kore.io/releases/4.3.0
- vulncheck.com https://www.vulncheck.com/advisories/kore-before-4.3.0-integer-underflow-memory-exhaustion-via-http-header-recv