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Vulnerability record · CVE-2026-14890 · published 16 July 2026

CVE-2026-14890: Lmsys sglang deserialization of untrusted data vulnerability

Lmsys · Sglang

SGLang uses an expert-parallel backup subsystem that exposes a ZeroMQ PULL socket on a routable network interface that does not contain authentication or deserialization safeguards, allowing an attacker to provide a malicious pickle file that results in unauthenticated remote code execution when the feature is enabled and the service is reachable over the network.

9.1 CVSS 3.1 Critical EPSS 1.00% · top 38.7% CWE-502 · Deserialization of untrusted data
9.1CVSS 3.1 base score
1.00%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References
10 Aug 2026Last modified by NVD

Description

SGLang uses an expert-parallel backup subsystem that exposes a ZeroMQ PULL socket on a routable network interface that does not contain authentication or deserialization safeguards, allowing an attacker to provide a malicious pickle file that results in unauthenticated remote code execution when the feature is enabled and the service is reachable over the network.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://vince.cert.org/vuls/id/326070 Permissions Required
https://github.com/sgl-project/sglang/blob/main/python/sglang/srt/elastic_ep/expert_backup_manager.py Product
https://www.kb.cert.org/vuls/id/326070 MitigationThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2026-15969Lmsys sglang deserialization of untrusted data vulnerabilitySGLang contains an unauthenticated RCE in /load_lora_adapter_from_tensors via bypass of SafeUnpickler’s incomplete denylist, allowing arbitrary comma…EPSS 1.0%9.8CVE-2026-15971Lmsys sglang vulnerabilitySGLang contains an RCE vulnerability when the optional dumper subsystem is enabled, allowing for a sandbox escape when DUMPER_SERVER_PORT is set, ena…EPSS 0.73%9.8CVE-2026-15976Lmsys sglang deserialization of untrusted data vulnerabilitySGLang contains a RCE vulnerability when attempting to load model weights from a HuggingFace repository, specifically within the /update_weights_from…EPSS 0.60%9.8CVE-2026-7301Lmsys sglang deserialization of untrusted data vulnerabilitySGLangs 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…EPSS 0.60%9.8CVE-2026-7304Lmsys sglang deserialization of untrusted data vulnerabilitySGLangs multimodal generation runtime is vulnerable to unauthenticated remote code execution when the --enable-custom-logit-processor option is enabl…EPSS 0.88%9.8CVE-2026-5760Lmsys sglang code injection vulnerabilitySGLang's reranking endpoint (/v1/rerank) achieves Remote Code Execution (RCE) when a model file containing a malcious tokenizer.chat_template is load…EPSS 1.1%9.8CVE-2026-3059Lmsys sglang deserialization of untrusted data vulnerabilitySGLang's multimodal generation module is vulnerable to unauthenticated remote code execution through the ZMQ broker, which deserializes untrusted dat…EPSS 1.3%9.8CVE-2026-3060Lmsys sglang deserialization of untrusted data vulnerabilitySGLang' encoder parallel disaggregation system is vulnerable to unauthenticated remote code execution through the disaggregation module, which deseri…EPSS 1.3%

Source: NIST National Vulnerability Database (record CVE-2026-14890), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.