Weak Hash Vulnerability in LMCache KV Cache Handler Affecting Local Installations
CVE-2026-10813

2LOW

Key Information:

Vendor

LMCache

Status
Lmcache
Vendor
CVE Published:
4 June 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-10813?

A vulnerability has been identified within LMCache's KV Cache Handler, specifically in the hex_hash_to_int16 function found in the lmcache/integration/vllm/utils.py file. This flaw allows for the use of an insecure hash through local manipulation, resulting in potential cache poisoning. Successfully exploiting this vulnerability is complex and requires a high degree of technical skill. The exploit has been documented and available for use, with ongoing efforts to address the issue through a pending pull request.

Affected Version(s)

LMCache 0.4.0

LMCache 0.4.1

LMCache 0.4.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-10813 - Proof of Concept

References

https://vuldb.com/vuln/368261
vdb-entrytechnical-description
https://vuldb.com/vuln/368261/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-10813
third-party-advisory

CVSS V4

Score:
2
Severity:
LOW
Confidentiality:
None
Integrity:
Low
Availability:
Low
Attack Vector:
Local
Attack Complexity:
High
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Dem00 (VulDB User)
VulDB CNA Team
.