Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Versions of vLLM from 0.12.0 before 0.24.0 are affected when prompt embeds are enabled on a model that uses M-RoPE. A remote user who can reach the /v1/completions endpoint can send a request with prompt embeds and no prompt text, which triggers a failed assertion that crashes the engine and shuts down the server (denial of service). Upgrade to vLLM 0.24.0 or later. Disabling prompt embeds on affected M-RoPE models is a possible workaround.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 7.1 | High | 4.0 | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0066, the 52nd percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:29 UTC First seen by agentprime
- 31 Oct 2026, 14:29 UTC Confirmed by OSV
Sources
- GitHub Advisory Database: GHSA-33cg-gxv8-3p8g
- OSV: GHSA-33cg-gxv8-3p8g
- github.com/vllm-project/vllm/security/advisories/GHSA-33cg-gxv8-3p8g
- nvd.nist.gov/vuln/detail/CVE-2026-55514
- github.com/vllm-project/vllm/pull/45252
- github.com/vllm-project/vllm/commit/470229c37efaf69c86e8bc97482b0b1ff7551c65
- github.com/pypa/advisory-database/tree/main/vulns/vllm/PYSEC-2026-2303.yaml
- github.com/vllm-project/vllm
- github.com/vllm-project/vllm/releases/tag/v0.24.0