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CVE-2026-3989

High

Description

SGLangs `replay_request_dump.py` contains an insecure pickle.load() without validation and proper deserialization. An attacker can take advantage of this by providing a malicious .pkl file, which will execute the attackers code on the device running the script.

SeverityHigh
CVSS7.8
Exploit probability—
ProductLmsys Sglang
PublishedMar 12, 2026
First seenMar 12, 2026
Weakness typeCWE-502Deserialization of untrusted data

How to fix

Update
  • lmsys sglang0.5.10 or later
  • sglang0.5.10 or later

Affected products

ProductAffected versionsFixed in
lmsys sglangv < 0.5.100.5.10
sglangPyPIv < 0.5.100.5.10

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