CVE-2026-7669: Sglang SGLang Has An Improper Input Vulnerability

MODERATE
Advisory Identifier: GHSA-6m5f-673f-5vh7
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CVSS 5.6
CWE-20 CWE-74
Published
Advisory Summary

CVE-2026-7669 is a MODERATE (CVSS 5.6) sglang has an improper input vulnerability (CWE-20: Improper Input Validation) affecting Sglang libraries in the PyPI ecosystem. The issue involves sglang has an improper input validation/injection issue. Remediation is available in the latest vendor maintenance releases.

CVE-2026-7669 at a Glance

CVE Identifier CVE-2026-7669
GHSA Identifier GHSA-6m5f-673f-5vh7
Severity MODERATE
CVSS v3.1 Base Score 5.6
CWE Classification CWE-20: Improper Input Validation
Affected Product Sglang
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 5.6

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L).

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability Low (A:L)

How to Fix CVE-2026-7669

To remediate this vulnerability, upgrade all affected Sglang dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

sglang fixed: Latest secure release 
pip install sglang>=Latest secure release
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

pip show sglang

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2026-7669, inspect your installed packages using pip:

pip show sglang

Analyze the terminal output to locate any version of Sglang in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The pip show sglang command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-20: Improper Input Validation, where the product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. In Sglang, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

A vulnerability was detected in sgl-project SGLang up to 0.5.9. Impacted is the function get_tokenizer of the file python/sglang/srt/utils/hf_transformers_utils.py of the component HuggingFace Transformer Handler. The manipulation results in deserialization. The attack can be executed remotely. A high complexity level is associated with this attack. The exploitability is considered difficult. The vendor was contacted early about this disclosure but did not respond in any way.

CVE-2026-7669 Affected Sglang Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
sglang
pypi/sglang
PyPI
≤ 0.5.9

References

NVD — CVE-2026-7669 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-7669
Sglang Source Repository REPOSITORY
https://github.com/gouldnicholas/CVE-2026-7669-PoC
Sglang Source Repository REPOSITORY
https://github.com/sgl-project/sglang
vuldb.com/submit/799263 WEB
https://vuldb.com/submit/799263
vuldb.com/vuln/360817 WEB
https://vuldb.com/vuln/360817
vuldb.com/vuln/360817/cti WEB
https://vuldb.com/vuln/360817/cti

Frequently Asked Questions

What is CVE-2026-7669?
CVE-2026-7669 is a security vulnerability in Sglang involving SGLang has an Improper Input Validation/Injection Issue under CWE-20: Improper Input Validation.
Which Sglang versions are affected?
Affected versions include releases prior to current release patches across affected packages: sglang.
What version fixes CVE-2026-7669?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is sglang affected?
Yes, sglang is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of CVE-2026-7669?
CVE-2026-7669 has a CVSS v3.1 base score of 5.6 (MODERATE) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L.
What CWE is associated with CVE-2026-7669?
CVE-2026-7669 is classified under CWE-20: Improper Input Validation (The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.).
How can I check PyPI dependencies for CVE-2026-7669?
Run the dependency tree command: 'pip show sglang'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-6m5f-673f-5vh7",
  "modified" : "2026-05-07T21:09:29Z",
  "published" : "2026-05-03T00:31:37Z",
  "aliases" : [ "CVE-2026-7669" ],
  "summary" : "SGLang has an Improper Input Validation/Injection Issue",
  "details" : "A vulnerability was detected in sgl-project SGLang up to 0.5.9. Impacted is the function get_tokenizer of the file python/sglang/srt/utils/hf_transformers_utils.py of the component HuggingFace Transformer Handler. The manipulation results in deserialization. The attack can be executed remotely. A high complexity level is associated with this attack. The exploitability is considered difficult. The vendor was contacted early about this disclosure but did not respond in any way.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "sglang"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "0.5.9"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-7669"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/gouldnicholas/CVE-2026-7669-PoC"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/sgl-project/sglang"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/submit/799263"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/vuln/360817"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/vuln/360817/cti"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-20", "CWE-74" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-05-07T21:09:28Z",
    "nvd_published_at" : "2026-05-02T22:16:24Z"
  }
}