CVE•Published 2026-01-15•Modified 2026-04-13•1 article on news•5 live references•NVD data
CVE-2026-23527H3 · H3
Vulnerability data via NVD (ingested)
CVSS v3.1
8.9
HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L
EPSS percentile
—
Weaknesses (CWE)
Description
H3 is a minimal H(TTP) framework built for high performance and portability. Prior to 1.15.5, there is a critical HTTP Request Smuggling vulnerability. readRawBody is doing a strict case-sensitive check for the Transfer-Encoding header. It explicitly looks for "chunked", but per the RFC, this header should be case-insensitive. This vulnerability is fixed in 1.15.5.
Timeline
Published 2026-01-15
Modified 2026-04-13
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
Shodan · vuln tag0 hosts
vuln:CVE-2026-23527Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · product
product:"H3 H3"All exposed H3 H3 instances — cross-reference with the CVE's affected-version range.
Shodan · banner/body mention
http.html:"H3"HTTP body or banner mentions "H3" — catches deploys Shodan didn't identify as a product.
More intel sources (5)
Shodan report
vuln:CVE-2026-23527Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-23527Censys host search filtered to this CVE id.
grep.app
CVE-2026-23527Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-23527GitHub code search for direct mentions.
Google dork
"CVE-2026-23527" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub
No public proof-of-concept repositories found for CVE-2026-23527 on GitHub.