CVE-2026-121727
Kore before 4.3.0 Integer Underflow Memory Exhaustion via http_header_recv()
- State
- Published
- Severity
- 8.7 High
- Published
- Nov 3, 2026
- Updated
- Nov 3, 2026
- Reserved
- Nov 3, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.7 High | 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 | VulnCheck |
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | VulnCheck |
Weaknesses
- CWE-191 Integer Underflow (Wrap or Wraparound)
Affected Products
| Product | Versions |
|---|---|
korejorisvink |
|
References
- Patch Commitpatch
- https://github.com/jorisvink/koreproduct
- Kore 4.3.0 Release Notesrelease-notes
- https://github.com/jorisvink/kore/blob/4.3.0-rc5/src/http.c#L934technical-description
- VulnCheck Advisory: Kore before 4.3.0 Integer Underflow Memory Exhaustion via http_header_recv()third-party-advisory
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