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Vulnerability · Published Jun 4, 2026 · Assigned by VulDB

CVE-2026-10813LMCache KV Cache utils.py hex_hash_to_int16 weak hash

Low 3.6

In plain English

A low-severity broken cryptography in LMCache. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 0% of all known vulnerabilities).

Severity (CVSS 3.1)3.6Low
Exploit odds (30 days)<0.1%top 99.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

A flaw has been found in LMCache up to 0.5.4. This affects the function hex_hash_to_int16 of the file lmcache/integration/vllm/utils.py of the component KV Cache Handler. Executing a manipulation can lead to use of weak hash. The attack needs to be launched locally. The attack requires a high level of complexity. It is indicated that the exploitability is difficult. The exploit has been published and may be used. Upgrading to version 0.5.5 is able to mitigate this issue. This patch is called ce08eea76ce5898200efee55f4932fd07a7cabeb. It is suggested to upgrade the affected component. A contributor of the project confirms: "hex_hash_to_int16() was introduced in 0.3.1 (PR #882, commit f5174701). It is not present in 0.3.0, and it is still present in 0.4.7 through 0.5.4."

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
PyPIlmcacheno fix listedGHSA-3hh9-752g-5g22
PyPIlmcacheno fix listedPYSEC-2026-3480

Affected products (as reported)

VendorProductVersions
n/a LMCache 0.5.00.5.10.5.20.5.30.5.4

Weakness: CWE-328, CWE-327 · Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L/E:P/RL:O/RC:C

References