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  4. CVE 2026 121727 kore before 430 integer underflow memory
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Back to active CVEs
High · CVSS 8.7CVE-2026-121727

Kore before 4.3.0 Integer Underflow Memory Exhaustion via http_header_recv()CVE-2026-121727

Answer in brief

CVE-2026-121727 records a High severity (CVSS 8.7) vulnerability in Kore before 4.3.0 Integer Underflow Memory Exhaustion via http_header_recv(). The current sources do not mark it as known exploited. The current feed maps jorisvink/kore (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 3, 2026Updated Nov 3, 2026Source checked Nov 3, 2026First seen by HOL Nov 3, 2026Material review Nov 3, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 8.7
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 8.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps jorisvink/kore (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
jorisvink/koregeneric>=0 <4.3.04.3.0

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for jorisvink/kore.
  2. 2Review the reported fix. Update jorisvink/kore to 4.3.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Nov 3, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 3, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 3, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • Source referencekore.io
  • Source referencevulncheck.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-191
Source
CVE List V5
Source checked
Nov 3, 2026
References
5 linked sources
Open source record