CVE-2023-27371

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.

CVSS 3.1

5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

1.3% chance of exploitation in the next 30 days; higher than 69% of CVEs (scores of 2026-10-25)

CWE

CWE-125

Published

2023-02-28

Modified

2026-10-14

Record from

the NVD, synced 2026-10-19

Affected

• gnu:libmicrohttpd

References

• https://git.gnunet.org/libmicrohttpd.git/commit/?id=6d6846e20bfdf4b3eb1b592c97520a532f724238
• https://github.com/0xhebi/CVEs/tree/main/GNU%20Libmicrohttpd
• https://lists.debian.org/debian-lts-announce/2023/03/msg00029.html
• https://lists.gnu.org/archive/html/libmicrohttpd/2023-02/msg00000.html
• https://git.gnunet.org/libmicrohttpd.git/commit/?id=6d6846e20bfdf4b3eb1b592c97520a532f724238

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