Kore: Integer underflow in HTTP request body handling (CVE-2026-121727)
Kore before 4.3.0 contains an integer underflow vulnerability in HTTP request body handling that allows unauthenticated attackers to bypass http_body_max and exhaust worker memory.
CVE search metadata
CVE search record: CVE-2026-121727. Severity: high. CVSS: 7.5. KEV: no. Product: Kore (< 4.3.0). Brief: Kore: Integer underflow in HTTP request body handling (CVE-2026-121727). Brief link: https://feed.craftedsignal.io/briefs/2026-11-kore-integer-underflow/
Triage facts
Revision 1- Applicability
- Kore (< 4.3.0)
- Evidence
- Unknown
- Severity
- Low
- Sources
- 1 public source
- Freshness
- Revision 1Nov 4, 02:27 UTC
- Vulnerabilities
- 1 CVE
- Source quality
- A2Roughly even chance
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.