How severe is CVE-2026-3059?

CVE-2026-3059 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-3059 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-3059?

CVE-2026-3059 affects Lmsys Sglang. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-3059?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-3059 have an EU (EUVD) identifier?

Yes. CVE-2026-3059 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-11557.

When was CVE-2026-3059 published?

CVE-2026-3059 was published on 2026-03-12 and last updated on 2026-06-17.

CVE-2026-3059

CVE-2026-3059 is a critical-severity vulnerability in Lmsys Sglang with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-502.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 2% (73rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-11557
Weakness: CWE-502
Affected product: Lmsys Sglang
Published: 2026-03-12
Last modified: 2026-06-17

Description

SGLang's multimodal generation module is vulnerable to unauthenticated remote code execution through the ZMQ broker, which deserializes untrusted data using pickle.loads() without authentication.

Frequently asked questions

What is CVE-2026-3059?: SGLang's multimodal generation module is vulnerable to unauthenticated remote code execution through the ZMQ broker, which deserializes untrusted data using pickle.loads() without authentication.
How severe is CVE-2026-3059?: CVE-2026-3059 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-3059 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-3059?: CVE-2026-3059 affects Lmsys Sglang. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-3059?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-3059 have an EU (EUVD) identifier?: Yes. CVE-2026-3059 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-11557.
When was CVE-2026-3059 published?: CVE-2026-3059 was published on 2026-03-12 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:lmsys:sglang:*:*:*:*:*:*:*:*

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