Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
The vLLM package, versions before 0.26.0, leaks internal information in responses to malformed API requests. An unauthenticated attacker who sends one malformed request, such as invalid JSON or missing required fields, can get the OS username, home and virtual environment paths, Python version, and internal file paths and line numbers in the error response. Upgrade to vLLM 0.26.0 or later.
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 |
|---|---|---|---|---|
| 5.3 | Medium | 3.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0041, the 36th percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:10 UTC First seen by agentprime
- 31 Oct 2026, 14:10 UTC Confirmed by OSV
Sources
- GitHub Advisory Database: GHSA-hwrm-c4cx-rf4j
- OSV: GHSA-hwrm-c4cx-rf4j
- github.com/vllm-project/vllm/security/advisories/GHSA-hwrm-c4cx-rf4j
- nvd.nist.gov/vuln/detail/CVE-2026-73555
- github.com/vllm-project/vllm/pull/46415
- github.com/vllm-project/vllm/commit/e87521626febe2763f997691d1599de4175f4324
- github.com/vllm-project/vllm
- github.com/vllm-project/vllm/releases/tag/v0.26.0