CVE-2026-44452
- Source
- https://cve.org/CVERecord?id=CVE-2026-44452
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-44452.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-44452
- Aliases
-
- GHSA-w68q-rqwx-7wvq
- Downstream
- Published
- 2026-07-16T22:54:42.914Z
- Modified
- 2026-07-19T03:30:51.882198088Z
- Severity
-
- 5.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- h2o is vulnerable to heap overrun
- Details
-
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. Prior to commit 8dc37cb, when h2o receives a ClientHello message over TLS or QUIC and it contains a zero-length SNI extension, the h2o server runs over the zero-length hostname while trying to copy the hostname, assuming that it is NULL-terminated. This is a potential denial-of-service attack vector in sense that it might trigger segmentation violation. This issue has been fixed by commit 8dc37cb.
- Database specific
{ "cwe_ids": [ "CWE-125", "CWE-170" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44452.json", "cna_assigner": "GitHub_M", "unresolved_ranges": [ { "extracted_events": [ { "fixed": "8dc37cb" } ], "source": "AFFECTED_FIELD" } ] }- References
Affected packages
Git / github.com/h2o/h2o
Affected versions
v0.*
v0.9.1
v0.9.2
v1.*
v1.0.1
v1.1.0
v1.1.1
v1.2.0
v1.3.0
v1.3.0-beta1
v1.3.1
v1.4.0
v1.4.1
v1.4.2
v1.5.0
v1.5.0-beta1
v1.5.0-beta2
v1.5.0-beta3
v1.5.0-beta4
v1.5.1
v1.5.2
v1.5.3
v1.6.0
v1.6.0-beta1
v1.6.0-beta2
v1.7.0
v1.7.0-beta1
v1.7.0-beta2
v1.7.0-beta3
v1.7.0-beta4
v1.7.0-beta5