CVE-2026-23527 describes a critical HTTP Request Smuggling vulnerability in the H3 framework, affecting versions prior to 1.15.5. The flaw stems from a case-sensitive check for the "Transfer-Encoding" header, which should be case-insensitive per RFC standards. This vulnerability carries a CVSS score of 9.8 (CRITICAL), indicating it can be exploited remotely with low complexity, leading to high impacts on confidentiality, integrity, and availability. While there is no evidence of active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), the vulnerability has garnered significant community discussion, with 11 mentions across various platforms.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 1.15.5CPE matchmatch criteria | cpe:2.3:a:h3:h3:*:*:*:*:*:node.js:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.