CVE-2023-27371: GNU Libmicrohttpd

Medium severity, CVSS 5.9. EPSS: 1.3% chance of exploitation in the next 30 days.

GNU libmicrohttpd before 0.9.76 allows remote DoS (Denial of Service) due to improper parsing of a multipart/form-data boundary in the postprocessor.c MHD_create_post_processor() method. This allows an attacker to remotely send a malicious HTTP POST packet that includes one or more '\0' bytes in a multipart/form-data boundary field, which - assuming a specific heap layout - will result in an out-of-bounds read and a crash in the find_boundary() function.

Affected products

• GNU Libmicrohttpd: before 0.9.76 (fixed in 0.9.76)

Published 2023-02-28. Last modified 2026-06-17.