CVE-2026-5760Public exploitNetwork attack vector

Remote code execution via unsandboxed Jinja templates

Published Apr 20, 2026 · Updated Apr 20, 2026

Server-side template injection in SGLang before 0.5.11 allows remote attackers to execute Python code through the /v1/rerank endpoint. The _get_jinja_env() function in serving_rerank.py renders a model-supplied tokenizer.chat_template with unsandboxed jinja2.Environment(), permitting unsafe attribute traversal into command-execution primitives. Exploitation requires an operator to load an attacker-crafted GGUF reranker model and a request to reach the endpoint; code runs with the SGLang service's privileges.

CVSS severity9.8
Critical
EPSS probability0.85%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Server-side template injection in SGLang before 0.5.11 allows remote attackers to execute Python code through the /v1/rerank endpoint. The _get_jinja_env() function in serving_rerank.py renders a model-supplied tokenizer.chat_template with unsandboxed jinja2.Environment(), permitting unsafe attribute traversal into command-execution primitives. Exploitation requires an operator to load an attacker-crafted GGUF reranker model and a request to reach the endpoint; code runs with the SGLang service's privileges.

The record

CVE
CVE-2026-5760
Published
Apr 20, 2026
Updated
Apr 20, 2026
Vendor
SGLang
Product
SGLang
Classifications
CWE-94, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.59

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SGLang · SGLangversion=0.59

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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