PYSEC-2026-3480

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Import Source
https://github.com/pypa/advisory-database/blob/main/vulns/lmcache/PYSEC-2026-3480.yaml
JSON Data
https://api.osv.dev/v1/vulns/PYSEC-2026-3480
Aliases
Published
2026-07-23T11:41:38.726472Z
Modified
2026-07-23T15:00:13.750119453Z
Severity
  • 3.6 (Low) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L CVSS Calculator
  • 1.1 (Low) CVSS_V4 - CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:P CVSS Calculator
Summary
LMCache: 16-bit multimodal hash collision can poison KV cache entries
Details

A flaw has been found in LMCache up to 0.4.6. This affects the function hexhashto_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. The pull request to fix this issue awaits acceptance.

References

Affected packages

PyPI / lmcache

Package

Name
lmcache
View open source insights on deps.dev
Purl
pkg:pypi/lmcache

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Last affected
0.4.6

Affected versions

0.*
0.3.0
0.3.1
0.3.1.post1
0.3.2
0.3.3
0.3.4
0.3.5
0.3.6
0.3.7
0.3.9
0.3.9.post1
0.3.9.post2
0.3.10
0.3.10.post1
0.3.10.post2
0.3.11
0.3.12
0.3.13
0.3.14
0.3.15
0.4.1
0.4.2
0.4.3
0.4.4
0.4.5
0.4.6

Database specific

source 
"https://github.com/pypa/advisory-database/blob/main/vulns/lmcache/PYSEC-2026-3480.yaml"