LMCache KV Cache utils.py hex_hash_to_int16 weak hash

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-10813
StatePUBLISHED
AssignerVulDB
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-04 16:16:32 UTC
Updated2026-10-17 07:16:49 UTC
DescriptionA 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."

Risk And Classification

Primary CVSS: v4.0 1.1 LOW from [email protected]

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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS: 0.000750000 probability, percentile 0.001240000 (date 2026-07-22)

Problem Types: CWE-327 | CWE-328 | CWE-328 Use of Weak Hash | CWE-327 Risky Cryptographic Algorithm

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary1.1LOWCVSS: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/C...
4.0CNADECLARED2LOWCVSS: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
3.1[email protected]Secondary3.6LOWCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L
3.1CNADECLARED3.6LOWCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L/E:P/RL:O/RC:C
3.0CNADECLARED3.6LOWCVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L/E:P/RL:O/RC:C
2.0[email protected]Secondary2.4AV:L/AC:H/Au:S/C:N/I:P/A:P
2.0CNADECLARED2.4AV:L/AC:H/Au:S/C:N/I:P/A:P/E:POC/RL:OF/RC:C

CVSS v4.0 Breakdown

Attack Vector
Local
Attack Complexity
High
Attack Requirements
None
Privileges Required
Low
User Interaction
None
Confidentiality
None
Integrity
Low
Availability
Low
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
Low

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L

CVSS v3.0 Breakdown

Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
Low

CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L/E:P/RL:O/RC:C

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na LMCache affected 0.5.0 Not specified
CNA Na LMCache affected 0.5.1 Not specified
CNA Na LMCache affected 0.5.2 Not specified
CNA Na LMCache affected 0.5.3 Not specified
CNA Na LMCache affected 0.5.4 Not specified
CNA Na LMCache unaffected 0.5.5 Not specified

References

ReferenceSourceLinkTags
vuldb.com/vuln/368261 [email protected] vuldb.com
vuldb.com/cve/CVE-2026-10813 [email protected] vuldb.com
pypi.org/project/lmcache/0.5.5 [email protected] pypi.org
vuldb.com/submit/831641 [email protected] vuldb.com
github.com/LMCache/LMCache/commit/ce08eea76ce5898200efee55f4932fd07a7cabeb [email protected] github.com
github.com/LMCache/LMCache [email protected] github.com
vuldb.com/vuln/368261/cti [email protected] vuldb.com
github.com/LMCache/LMCache/issues/3301 [email protected] github.com
github.com/LMCache/LMCache/pull/4783 [email protected] github.com
github.com/LMCache/LMCache/pull/2932 MITRE github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Dem00 (VulDB User) (en)

CNA: VulDB CNA Team (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-06-04T00:00:00.000ZAdvisory disclosed
CNA2026-06-04T02:00:00.000ZVulDB entry created
CNA2026-10-17T08:23:25.000ZVulDB entry last update

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