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.
Published: 2026-11-03
Score: 8.7 High
EPSS: < 1% Very Low
KEV: No
AI Analysis

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Remediation

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Tracking

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Advisories

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History

Tue, 03 Nov 2026 23:00:00 +0000

Type Values Removed Values Added
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.
Title Kore before 4.3.0 Integer Underflow Memory Exhaustion via http_header_recv()
Weaknesses CWE-191
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 8.7, 'vector': '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'}

Subscriptions

No data.

cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-11-03T22:55:33.948Z

Reserved: 2026-11-03T22:17:02.851Z

Link: CVE-2026-121727

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-11-03T23:17:36.043

Modified: 2026-11-03T23:17:36.043

Link: CVE-2026-121727

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-11-04T09:15:07Z

Weaknesses
  • CWE-191

    Integer Underflow (Wrap or Wraparound)