CVE-2026-3989: SGLangs `replay_request_dump.py` contains an insecure pickle.load() without validation and proper deserialization

March 12, 2026

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.

References

github.com/advisories/GHSA-hvwj-8w5g-28rg
github.com/sgl-project/sglang
github.com/sgl-project/sglang/blob/main/scripts/playground/replay_request_dump.py
nvd.nist.gov/vuln/detail/CVE-2026-3989
orca.security/resources/blog/sglang-llm-framework-rce-vulnerabilities

Code Behaviors & Features

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