CVE-2026-10813Public exploit

KV cache poisoning via 16-bit image hashes

Published Jun 4, 2026 · Updated Jun 4, 2026

Weak hash use in LMCache 0.4.0 through 0.4.6 allows local users to poison multimodal KV cache entries with colliding image identifiers. The hex_hash_to_int16 function masks hexadecimal identifiers to 16 bits or keeps only two SHA-256 bytes before embedding the value in token IDs used to derive cache keys. Exploitation requires low-privileged local access, many chosen multimodal identifiers, and matching prompt structure; a collision can return KV data for a different image and corrupt model output.

CVSS severity3.6
Low
EPSS probability0.07%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Weak hash use in LMCache 0.4.0 through 0.4.6 allows local users to poison multimodal KV cache entries with colliding image identifiers. The hex_hash_to_int16 function masks hexadecimal identifiers to 16 bits or keeps only two SHA-256 bytes before embedding the value in token IDs used to derive cache keys. Exploitation requires low-privileged local access, many chosen multimodal identifiers, and matching prompt structure; a collision can return KV data for a different image and corrupt model output.

The record

CVE
CVE-2026-10813
Published
Jun 4, 2026
Updated
Jun 4, 2026
Vendor
LMCache
Product
LMCache
Classifications
CWE-327, CWE-328, T1565.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.4.0
  2. Affected versionversion=0.4.1
  3. Affected versionversion=0.4.2
  4. Affected versionversion=0.4.3
  5. Affected versionversion=0.4.4
  6. Affected versionversion=0.4.5
  7. Affected versionversion=0.4.6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

LMCache · LMCacheversion=0.4.0; version=0.4.1; version=0.4.2; version=0.4.3; version=0.4.4; version=0.4.5; version=0.4.6

Published CVSS scores

3.6VulDBCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L
1.1VulDBCVSS: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
2.4VulDBAV:L/AC:H/Au:S/C:N/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-327Use of a Broken or Risky Cryptographic Algorithm
CWE-328Use of Weak Hash
T1565.001Stored Data Manipulation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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