CVE-2026-7301: SGLangs multimodal generation runtime scheduler's ROUTER socket binds to 0.0.0.0 by default and contains a sin

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CRITICAL 9.8REMOTEDOWNGRADE

CVE-2026-7301 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.

SGLangs multimodal generation runtime scheduler's ROUTER socket binds to 0.0.0.0 by default and contains a sink that calls pickle.loads() on incoming messages, enabling RCE when exposed to the internet.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 66%)
CISA exploited list	No
Weakness	CWE-502
Published	2026-05-18
Last modified	2026-10-14

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

Last updated 2026-10-14 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-18 12:16 UTCPublished CVE record published
2026-10-14 20:10 UTCUpdated Record last modified

lmsys sglang DOWNGRADE

Affected: 0.5.10

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.5.10

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.5.10 (Debian / Ubuntu)

apt-cache madison sglang sudo apt install sglang=<VERSION_BEFORE_0.5.10> sudo apt-mark hold sglang

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list sglang sudo dnf downgrade sglang-<VERSION_BEFORE_0.5.10> sudo dnf versionlock add sglang

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2026-7301?

sglang: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-7301 being exploited?

CVE-2026-7301 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-2026-7301 affect?

CVE-2026-7301 affects sglang. Severity is critical (CVSS 9.8). SGLangs multimodal generation runtime scheduler's ROUTER socket binds to 0.0.0.0 by default and contains a sink that calls pickle.loads() on incoming messages, enabling RCE when exposed to the internet.

How urgent is CVE-2026-7301?

Priority 48/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

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References

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