Vulnerability · Published Oct 26, 2026 · Assigned by GitHub_M

CVE-2026-115912vLLM: Public multimodal SHM handle forgery reaches worker-side `pickle.loads()` with insecure serialization disabled

High 7.5

In plain English

A high-severity unsafe deserialization in vllm from vllm-project. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 44% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High

Exploit odds (30 days)0.5%top 56.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

vLLM is an inference and serving engine for large language models. Prior to 0.32.0, an authenticated caller can place forged shared-memory address and monotonic_id values in public multimodal features.kwargs_data. In scale-out deployments with shared-memory multimodal caching enabled, workers trust those values and pass attacker-selected bytes to pickle.loads(), allowing arbitrary Python execution even when insecure serialization is disabled. This issue is fixed in version 0.32.0.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	vllm	0.32.0	GHSA-6757-hggm-hp2w
PyPI	vllm	0.32.0	PYSEC-2026-4345

Affected products (as reported)

Vendor	Product	Versions
vllm-project	vllm	< 0.32.0

Weakness: CWE-502 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

References

https://github.com/vllm-project/vllm/security/advisories/GHSA-6757-hggm-hp2w x_refsource_CONFIRM
https://github.com/vllm-project/vllm/pull/59357 x_refsource_MISC
https://github.com/vllm-project/vllm/commit/3d5625cc3c2474994107047d7a6ecb8e4008f9b0 x_refsource_MISC
https://github.com/vllm-project/vllm/releases/tag/v0.32.0 x_refsource_MISC