CVE-2026-73256: mongoose before 7.22 (exclusive), < 7.22

CVE-2026-73256. CVSS 3.1 base score 9.1 (CRITICAL, Vendor/CNA). EPSS 0.00439 (percentile 0.36707), scored 17-Oct-2026.

Affected technology

mongoose · before 7.22 (exclusive)
cesanta

mongoose · < 7.22
cesanta

Component: Not specified by the source
Function: in

Attack conditions (Vendor/CNA, CVSS 3.1): Network (remote) · No privileges required · No user interaction required

What an attacker can do

A remote unauthenticated attacker can exploit an HTTP/1.0 reverse-proxy deployment by sending a request with Transfer-Encoding: chunked and conflicting framing. Vendor/CNA’s CVSS 3.1 assessment (base score 9.1/10) rates confidentiality and integrity impact as high; availability impact as none.

Published 18-Oct-2026 20:24 UTC

CWE: CWE-444
CCR priority: 36.5 /100 (P4)
CVSS 3.1: 9.1 /10 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N · Vendor/CNA
EPSS: 0.00439 · percentile 0.36707 · 2026-10-17
KEV: no

Provenance

NVD CVE API 2.0 · Source record · observed 2026-10-18 20:23:06.032219+00:00 UTC

Stable permalink: https://cybercodered.org/item/cve-cve-2026-73256.html