CVE-2026-73258 - Mongoose: Multipart boundary/header scan logic error in mg_http_next_multipart
Brief
CVE ID : CVE-2026-73258
Published : Aug. 20, 2026, 6:16 p. m.
- 52 minutes ago
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.
- Severity: 6.5
- MEDIUM
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