CVE-2026-15971: SGLang contains an RCE vulnerability when the optional dumper subsystem is enabled, allowing for a sandbox esc

Q: How do I fix CVE-2026-15971?

sglang: upgrade to newer than 0.5.15. Exact commands for each OS are on this page.

Q: Is CVE-2026-15971 being exploited?

CVE-2026-15971 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-15971 affect?

CVE-2026-15971 affects sglang. Severity is critical (CVSS 9.8). SGLang contains an RCE vulnerability when the optional dumper subsystem is enabled, allowing for a sandbox escape when DUMPER_SERVER_PORT is set, enabling code execution on inference requests.

Q: How urgent is CVE-2026-15971?

Priority 53/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2026-15971 is a critical-severity flaw (CVSS 9.8) affecting sglang. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

SGLang contains an RCE vulnerability when the optional dumper subsystem is enabled, allowing for a sandbox escape when DUMPER_SERVER_PORT is set, enabling code execution on inference requests.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 46%)
CISA exploited list	No
Weakness	CWE-95
Published	2026-07-30
Last modified	2026-08-04

Publisher (CNA): CERT/CC · Vendor: lmsys

Last updated 2026-08-04 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-30 19:17 UTCPublished CVE record published
2026-08-04 20:42 UTCUpdated Record last modified

lmsys sglang UPGRADE

Affected: <= 0.5.15

Fixed in: newer than 0.5.15

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy sglang || rpm -q sglang || sglang --version

2. UPGRADE to newer than 0.5.15 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade sglang

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade sglang

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-15971?

sglang: upgrade to newer than 0.5.15. Exact commands for each OS are on this page.

Is CVE-2026-15971 being exploited?

CVE-2026-15971 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-15971 affect?

CVE-2026-15971 affects sglang. Severity is critical (CVSS 9.8). SGLang contains an RCE vulnerability when the optional dumper subsystem is enabled, allowing for a sandbox escape when DUMPER_SERVER_PORT is set, enabling code execution on inference requests.

How urgent is CVE-2026-15971?

Priority 53/100. Critical severity; Remotely exploitable, no login, no user action

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References

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