CVE-2026-10300: SGLang Reachable Assertion Vulnerability

LOW
Advisory Identifier: GHSA-m2jr-x4gq-5rmj
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CVSS 3.7
CWE-617
Published
Advisory Summary

CVE-2026-10300 is a LOW (CVSS 3.7) reachable assertion vulnerability (CWE-617: Reachable Assertion) affecting SGLang libraries in the PyPI ecosystem. The issue involves reachable assertion via  lora_path  in loramanager enables remote denial of dervice. Remediation is available in the latest vendor maintenance releases.

CVE-2026-10300 at a Glance

CVE Identifier CVE-2026-10300
GHSA Identifier GHSA-m2jr-x4gq-5rmj
Severity LOW
CVSS v3.1 Base Score 3.7
CWE Classification CWE-617: Reachable Assertion
Affected Product SGLang
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 3.7

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:N/I:N/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 None (C:N)
Integrity None (I:N)
Availability Low (A:L)

How to Fix CVE-2026-10300

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-2026-10300, 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-617: Reachable Assertion, where the product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary. 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 security vulnerability has been detected in SGLang 0.5.10.post1. Impacted is an unknown function of the file python/sglang/srt/lora/lora_manager.py of the component Inference HTTP Endpoint. Such manipulation of the argument lora_path leads to reachable assertion. The attack can be launched remotely. A high complexity level is associated with this attack. The exploitability is considered difficult. The exploit has been disclosed publicly and may be used. The pull request to fix this issue awaits acceptance.

CVE-2026-10300 Affected SGLang Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
sglang
pypi/sglang
PyPI
≤ 0.5.10.post1

References

NVD — CVE-2026-10300 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-10300
SGLang Source Repository REPOSITORY
https://github.com/sgl-project/sglang/issues/23141
SGLang Source Repository REPOSITORY
https://github.com/sgl-project/sglang/pull/25078
SGLang Source Repository REPOSITORY
https://github.com/sgl-project/sglang
vuldb.com/cve/cve-2026-10300 WEB
https://vuldb.com/cve/CVE-2026-10300
vuldb.com/submit/828086 WEB
https://vuldb.com/submit/828086
vuldb.com/vuln/367593 WEB
https://vuldb.com/vuln/367593
vuldb.com/vuln/367593/cti WEB
https://vuldb.com/vuln/367593/cti

Frequently Asked Questions

What is CVE-2026-10300?
CVE-2026-10300 is a security vulnerability in SGLang involving Reachable Assertion via  lora_path  in LoRAManager enables remote Denial of Dervice under CWE-617: Reachable Assertion.
Which SGLang versions are affected?
Affected versions include releases prior to current release patches across affected packages: sglang.
What version fixes CVE-2026-10300?
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-2026-10300?
CVE-2026-10300 has a CVSS v3.1 base score of 3.7 (LOW) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L.
What CWE is associated with CVE-2026-10300?
CVE-2026-10300 is classified under CWE-617: Reachable Assertion (The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary.).
How can I check PyPI dependencies for CVE-2026-10300?
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-m2jr-x4gq-5rmj",
  "modified" : "2026-07-09T13:43:55Z",
  "published" : "2026-06-02T00:31:58Z",
  "aliases" : [ "CVE-2026-10300" ],
  "summary" : "SGLang: Reachable Assertion via  lora_path  in LoRAManager enables remote Denial of Dervice",
  "details" : "A security vulnerability has been detected in SGLang 0.5.10.post1. Impacted is an unknown function of the file python/sglang/srt/lora/lora_manager.py of the component Inference HTTP Endpoint. Such manipulation of the argument lora_path leads to reachable assertion. The attack can be launched remotely. A high complexity level is associated with this attack. The exploitability is considered difficult. The exploit has been disclosed publicly and may be used. The pull request to fix this issue awaits acceptance.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "sglang"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "0.5.10.post1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-10300"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/sgl-project/sglang/issues/23141"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/sgl-project/sglang/pull/25078"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/sgl-project/sglang"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/cve/CVE-2026-10300"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/submit/828086"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/vuln/367593"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/vuln/367593/cti"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-617" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-07-09T13:43:55Z",
    "nvd_published_at" : "2026-06-01T23:16:19Z"
  }
}