SEPTEMBER 18, 2026
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Case File

CVE-2026-73258

MEDIUM · CVSS 6.5 EPSS 0.32% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-08-20 · Last synced 2026-09-18

CyberRota Analysis

AI-Generated

Mongoose, an embedded web server and network library, is vulnerable to a flaw that allows remote attackers to manipulate multipart input, potentially leading to the acceptance of malicious content due to improper handling of CRLF terminators. This vulnerability can result in truncated headers, filenames, or boundaries, which may compromise application security by accepting dangerous content. Organizations using versions prior to 7.22 should prioritize updating to mitigate the risk of exploitation.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-73258
Severity
MEDIUM
CVSS
6.5
EPSS
0.32%

Original NVD Description

Mongoose is an embedded web server and network library. Prior to 7.22, a remote attacker can place a lone carriage return or line feed in multipart input processed by mg_http_next_multipart() in src/http.c. The loops comparing s[b] and s[b + 1], and s[h2] and s[h2 + 1], use an incorrect AND condition and stop when either character resembles part of a CRLF terminator. This truncates headers, filenames, or boundaries and can cause an application to accept dangerous content after seeing a misleading Content-Type value. This issue is fixed in version 7.22.