PT-2025-23227 · Vllm · Vllm

G-Eoj · Published 2025-05-28 · Updated 2025-06-24 · CVE-2025-48943

Positive Technologies (AI Summary)

CVSS v2.0

6.8

Medium

Base vector

AV:N/AC:L/Au:S/C:N/I:N/A:C

Name of the Vulnerable Software and Affected Versions vLLM versions 0.8.0 through 0.8.x

Description The issue is a Denial of Service (ReDoS) that causes the vLLM server to crash if an invalid regex is provided while using structured output. This is similar to a previously identified issue, but it affects regex instead of a JSON schema.

Recommendations For versions 0.8.0 through 0.8.x, update to version 0.9.0 to resolve the issue. As a temporary workaround, consider restricting the use of structured output with regex to minimize the risk of exploitation.

Exploit

Fix

DoS

Weakness Enumeration

CWE-248

Related Identifiers

BDU:2026-06584

CVE-2025-48943

GHSA-9HCF-V7M4-6M2J

PYSEC-2025-55

Affected Products

Vllm

References · 17

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/48xxx/CVE-2025-48943.json · Exploit
• https://github.com/vllm-project/vllm/commit/08bf7840780980c7568c573c70a6a8db94fd45ff · Patch
• https://github.com/vllm-project/vllm/security/advisories/GHSA-9hcf-v7m4-6m2j · Vendor Advisory
• https://github.com/vllm-project/vllm/pull/17623 · Patch
• https://osv.dev/vulnerability/GHSA-9hcf-v7m4-6m2j · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-48943 · Security Note
• https://osv.dev/vulnerability/CVE-2025-48943 · Vendor Advisory
• https://osv.dev/vulnerability/PYSEC-2025-55 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-06584 · Security Note
• https://github.com/vllm-project/vllm/issues/17313 · Note
• https://github.com/vllm-project/vllm · Note
• https://github.com/pypa/advisory-database/tree/main/vulns/vllm/PYSEC-2025-55.yaml · Note
• https://twitter.com/CVEnew/status/1928530097356812669 · Twitter Post
• https://t.me/cvenotify/126568 · Telegram Post
• https://t.me/cvetracker/25037 · Telegram Post