Denial of Service Vulnerability in mcp-searxng Model Context Protocol Server
CVE-2026-58483

7.5HIGH

Key Information:

Vendor

Ihor-sokoliuk

Status
Mcp-searxng
Vendor
CVE Published:
15 September 2026

What is CVE-2026-58483?

The mcp-searxng Model Context Protocol server is vulnerable due to improper handling of URLs within the web_url_read function. The issue arises from how the checkContentLength method processes the absence of a Content-Length header, allowing attackers to bypass set limits. This flaw can lead to unbounded memory consumption and increased CPU usage when response bodies are excessively large. An unauthenticated HTTP client can exploit this vulnerability to initiate denial of service attacks. This critical issue has been addressed in version 1.7.1.

Affected Version(s)

mcp-searxng < 1.7.1

References

https://github.com/ihor-sokoliuk/mcp-searxng/security/adv...
x_refsource_CONFIRM
https://github.com/ihor-sokoliuk/mcp-searxng/pull/121
x_refsource_MISC
https://github.com/ihor-sokoliuk/mcp-searxng/commit/f5a94...
x_refsource_MISC

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.