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Vulnerabilities

Vulnerability · CVE-2026-3989

SGLangs contains an insecure pickle.load() without validation and proper deserialization.

Published Mar 12, 2026 · catalog updated Aug 10, 2026 · SGLangs contains an insecure

Check if you run it

No confirmed exploitation is on record for CVE-2026-3989. EPSS is 0.48%. Act only if a listed version of SGLangs contains an insecure is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (SGLangs contains an insecure).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.48%
Remediation
Advisory link
Affected products
cpe lmsys/sglang

SGLangs 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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe lmsys/sglangversion unspecified

How to fix CVE-2026-3989

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-3989. EPSS is 0.48%. Act only if a listed version of SGLangs contains an insecure is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-502: Deserialization of Untrusted Data. EPSS 0.48%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 12, 2026 · NIST NVD

    Detected

    SGLangs 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.

  2. Aug 10, 2026 · NIST NVD

    Updated

    SGLangs 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.

Sources

  • CVE.orgVulnerability recordCVE-2026-3989

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-3989

    30-day exploitation probability 0.5%

    first.org
  • NIST NVDVulnerability recordCVE-2026-3989

    SGLangs 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.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.