CVE-2026-6608

Description

A vulnerability was detected in lm-sys fastchat up to 0.2.36. Impacted is the function add_text of the component Arena Side-by-Side View Handler. The manipulation results in incorrect control flow. The attack can be launched remotely. The exploit is now public and may be used. The root cause was fixed in commit 34eca62 for gradio_block_arena_named.py, but three other files were missed.

CVSS v3.1 Score

5.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

EPSS — Exploit Prediction

0.0005

Probability of exploitation

0.14%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-670 CWE-670

References

Other References

https://gist.github.com/YLChen-007/e45039d23e698222d887ee09735d9d36 https://github.com/lm-sys/FastChat/ https://github.com/lm-sys/FastChat/issues/3834 https://vuldb.com/submit/792228 https://vuldb.com/vuln/358243 https://vuldb.com/vuln/358243/cti

Frequently Asked Questions

What is CVE-2026-6608? +

A vulnerability was detected in lm-sys fastchat up to 0.2.36. Impacted is the function add_text of the component Arena Side-by-Side View Handler. The manipulation results in incorrect control flow. The attack can be launched remotely. The exploit is now public and may be used. The root cause was fixed in commit 34eca62 for gradio_block_arena_named.py, but three other files were missed. It has a CVSS v3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2026-6608? +

CVE-2026-6608 has a CVSS v3.1 score of 5.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0005, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-6608? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2026-40942

The Data Sharing Framework (DSF) implements a distributed process engine based on the BPMN 2.0 and FHIR R4 standards. Prior …

CVE-2025-24800

Hyperbridge is a hyper-scalable coprocessor for verifiable, cross-chain interoperability. A critical vulnerability was discovered in the ismp-grandpa crate, that allowed …

CVE-2025-43359 9.8

A logic issue was addressed with improved state management. This issue is fixed in iOS 18.7 and iPadOS 18.7, iOS …

CVE-2025-29312 9.1

An issue in onos v2.7.0 allows attackers to trigger unexpected behavior within a device connected to a legacy switch via …

CVE-2024-32971 9.0

Apollo Router is a configurable, graph router written in Rust to run a federated supergraph that uses Apollo Federation 2. …

CVE-2023-31211 8.8

Insufficient authentication flow in Checkmk before 2.2.0p18, 2.1.0p38 and 2.0.0p39 allows attacker to use locked credentials