CVE WatchAug 20, 2026

CVE-2026-73258

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 mu

CVSS

6.5

Medium

EPSS

0.3%

p19

KEV

—

Exploit Today

0-100

Published: Aug 20, 2026 · Last modified: Aug 20, 2026 · CWE-697

EPSS · 30d

0.3%EPSS · 30 days0.3%

2026-08-212026-08-30

Technical 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.

Official references

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