CVE-2024-10907: In lm-sys/fastchat Release v0.2.36, the server fails to handle excessive characters appended to the end of mul

This week

HIGH 7.5REMOTEDOWNGRADE

CVE-2024-10907 is a high-severity flaw (CVSS 7.5) affecting fastchat. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In lm-sys/fastchat Release v0.2.36, the server fails to handle excessive characters appended to the end of multipart boundaries. This flaw can be exploited by sending malformed multipart requests with arbitrary characters at the end of the boundary. Each extra character is processed in an infinite loop, leading to excessive resource consumption and a complete denial of service (DoS) for all users. The vulnerability is unauthenticated, meaning no

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 47%)
CISA exploited list	No
Weakness	CWE-835
Published	2025-03-20
Last modified	2026-06-17

Publisher (CNA): huntr.dev · Vendor: lm-sys

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-03-20 10:15 UTCPublished CVE record published
2026-06-17 06:56 UTCUpdated Record last modified

lm-sys fastchat DOWNGRADE

Affected: 0.2.36

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.2.36

1. Check installed version

apt-cache policy fastchat || rpm -q fastchat || fastchat --version

2. No fixed release: DOWNGRADE to a release before 0.2.36 (Debian / Ubuntu)

apt-cache madison fastchat sudo apt install fastchat=<VERSION_BEFORE_0.2.36> sudo apt-mark hold fastchat

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list fastchat sudo dnf downgrade fastchat-<VERSION_BEFORE_0.2.36> sudo dnf versionlock add fastchat

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2024-10907?

fastchat: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2024-10907 being exploited?

CVE-2024-10907 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2024-10907 affect?

CVE-2024-10907 affects fastchat. Severity is high (CVSS 7.5). In lm-sys/fastchat Release v0.2.36, the server fails to handle excessive characters appended to the end of multipart boundaries. This flaw can be exploited by sending malformed multipart requests with arbitrary characters at the end of the

How urgent is CVE-2024-10907?

Priority 50/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2024-12376 HIGH 7.5 DOWNGRADE A Server-Side Request Forgery (SSRF) vulnerability was identified in the lm-sys/fastchat web server, specifica
CVE-2024-11603 HIGH 7.5 DOWNGRADE A Server-Side Request Forgery (SSRF) vulnerability exists in lm-sys/fastchat version 0.2.36
CVE-2024-10912 HIGH 7.5 DOWNGRADE A Denial of Service (DoS) vulnerability exists in the file upload feature of lm-sys/fastchat version 0.2.36
CVE-2024-10908 MEDIUM 6.1 DOWNGRADE An open redirect vulnerability in lm-sys/fastchat Release v0.2.36 allows a remote unauthenticated attacker to
CVE-2024-10044 CRITICAL 9.3 DOWNGRADE A Server-Side Request Forgery (SSRF) vulnerability exists in the POST /worker_generate_stream API endpoint of

References

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