PT-2026-33713 · Lmsys · Fastchat

Eric-F · Published 2026-04-20 · Updated 2026-04-20 · CVE-2026-6607

Positive Technologies (AI Summary)

CVSS v3.1

5.3

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Name of the Vulnerable Software and Affected Versions lm-sys fastchat versions prior to 0.2.37

Description A flaw in the Worker API Endpoint allows remote attackers to cause resource consumption through the manipulation of the api generate() function.

Recommendations Install the patch provided in commit c9e84b89c91d45191dc24466888de526fa04cf33. As a temporary workaround, restrict access to the api generate() function to minimize the risk of resource exhaustion.

Exploit

Fix

Resource Exhaustion

Improper Resource Release

Weakness Enumeration

CWE-400

CWE-404

Related Identifiers

CVE-2026-6607

GHSA-5H65-JX66-J7P5

Affected Products

Fastchat

References · 11

• 🔥 https://gist.github.com/YLChen-007/87216a2d97a882d619e11dc67cd473b5 · Exploit
• https://github.com/lm-sys/FastChat/pull/3835 · Patch
• https://github.com/lm-sys/FastChat/commit/c9e84b89c91d45191dc24466888de526fa04cf33 · Patch
• https://osv.dev/vulnerability/GHSA-5h65-jx66-j7p5 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-6607 · Security Note
• https://github.com/lm-sys/FastChat · Note
• https://github.com/lm-sys/FastChat/issues/3833 · Note
• https://vuldb.com/submit/792227 · Note
• https://twitter.com/VulmonFeeds/status/2046136610022945097 · Twitter Post
• https://vuldb.com/vuln/358242/cti · Note
• https://vuldb.com/vuln/358242 · Note