CVE-2026-10813
LMCache KV Cache utils.py hex_hash_to_int16 weak hash
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."
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- High
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- Low
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
2.0
LMCache KV Cache utils.py hex_hash_to_int16 weak hash
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."
- Record
CVE-2026-10813- CVSS 4.0
- 2.0 Low
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 3.1
- 3.6 Low
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 - CVSS 3.0
- 3.6 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 - CVSS 2.0
- 2.4
AV:L/AC:H/Au:S/C:N/I:P/A:P/E:POC/RL:OF/RC:C - Weakness
- CWE-328, CWE-327
- Updated
- 2026-11-02
EUVDEUVD-2026-34290
2.0
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."
- Record
EUVD-2026-34290- CVSS 4.0
- 2.0 Low
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 - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-3hh9-752g-5g22
1.1
LMCache: 16-bit multimodal hash collision can poison KV cache entries
A flaw has been found in LMCache up to 0.4.6. 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. The pull request to fix this issue awaits acceptance.
- Record
GHSA-3hh9-752g-5g22- CVSS 4.0
- 1.1 Low
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 3.1
- 3.6 Low
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L - Weakness
- CWE-327
- Updated
- 2026-11-02
NVD
1.1
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."
- Record
CVE-2026-10813- CVSS 4.0
- 1.1 Low
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 3.1
- 3.6 Low
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L - CVSS 2.0
- 2.4 Low
AV:L/AC:H/Au:S/C:N/I:P/A:P - Weakness
- CWE-327, CWE-328
- Updated
- 2026-11-02
OSV
1.1
LMCache KV Cache utils.py hex_hash_to_int16 weak hash
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."
- Record
CVE-2026-10813- CVSS 4.0
- 1.1 Low
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 - Weakness
- CWE-327, CWE-328
- Updated
- 2026-11-02
OSVGHSA-3hh9-752g-5g22
1.1
LMCache: 16-bit multimodal hash collision can poison KV cache entries
A flaw has been found in LMCache up to 0.4.6. 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. The pull request to fix this issue awaits acceptance.
- Record
GHSA-3hh9-752g-5g22- CVSS 4.0
- 1.1 Low
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 3.1
- 3.6 Low
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L - Weakness
- CWE-327
- Updated
- 2026-11-02
OSVPYSEC-2026-3480
1.1
LMCache: 16-bit multimodal hash collision can poison KV cache entries
A flaw has been found in LMCache up to 0.4.6. 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. The pull request to fix this issue awaits acceptance.
- Record
PYSEC-2026-3480- CVSS 4.0
- 1.1 Low
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 3.1
- 3.6 Low
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L - Updated
- 2026-11-02
Affected packages
| Package | Affected | Fixed |
|---|---|---|
lmcachePyPI |
through 0.4.6 | None known |
lmcachePyPI |
through 0.4.6, plus listed versions 0.3.00.3.10.3.1.post10.3.100.3.10.post1 Show 20 moreShow less0.3.10.post20.3.110.3.120.3.130.3.140.3.150.3.20.3.30.3.40.3.50.3.60.3.70.3.90.3.9.post10.3.9.post20.4.10.4.20.4.30.4.40.4.5 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-10813 is a low vulnerability (CVSS 2.0) in lmcache, published June 4, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.08%, the 0th percentile. No source names a fixed version.
References
vuldb.com/vuln/368261
vuldb.com/vuln/368261/cti
vuldb.com/cve/CVE-2026-10813
vuldb.com/submit/831641
github.com/LMCache/LMCache/issues/3301
github.com/LMCache/LMCache/pull/4783
Show 8 moreShow less
github.com/LMCache/LMCache/commit/ce08eea76ce5898200efee55f4932fd07a7cabeb
pypi.org/project/lmcache/0.5.5
github.com/LMCache/LMCache
nvd.nist.gov/vuln/detail/CVE-2026-10813
github.com/LMCache/LMCache/pull/2932
github.com/advisories/GHSA-3hh9-752g-5g22
github.com/CVEProject/cvelistV5/tree/main/cves/2026/10xxx/CVE-2026-10813.json
pypi.org/project/lmcache