Read the docs
TI-2026-09281 Aliases CVE-2026-10813GHSA-3hh9-752g-5g22

LMCache KV Cache utils.py hex_hash_to_int16 weak hash

Priority MEDIUM 44CWE-327Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
High
Attack requirements
None
Impact type
Information disclosure
Confidentiality · integrity · availability
None · Low · Low
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-327.

Summary

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."

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00079 0th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed LMCache: 0.5.5

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
—LMCache0.5.0; 0.5.1; 0.5.2; 0.5.3; 0.5.40.5.5Patch availableCNA
—lmcache (PyPI)up to 0.4.6—No fix listedGHSA-3hh9-752g-5g22
  • LMCache Vendor— Affected 0.5.0; 0.5.1; 0.5.2; 0.5.3; 0.5.4 Fixed in 0.5.5 Patch available CNA
  • lmcache (PyPI) Vendor— Affected up to 0.4.6 Fixed in — No fix listed GHSA-3hh9-752g-5g22

CPE names CNA · 1

CPEVersionsRoleVendor
cpe:2.3:a:lmcache:lmcache:*:*:*:*:*:*:*:*——LMCache
  • cpe:2.3:a:lmcache:lmcache:*:*:*:*:*:*:*:* Versions — — ·LMCache

Remediation

  • Fix · CNA LMCache Fixed in 0.5.5

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-10813
  2. 2026-10-03 Alias added: GHSA-3hh9-752g-5g22
  3. 2026-10-18 CVSS score changed · CNA
  4. 2026-10-18 Fix available: n/a/[email protected] · CNA
  5. 2026-10-18 3 new references · CNA

References

Exploit 1

Patch 3

Advisory 1

Other 3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences