Nixpkgs security tracker
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CVE-2026-44452
5.9 MEDIUM
- CVSS version (CVSS): 3.1
- Attack Vector (AV): Network (N)
- Attack Complexity (AC): High (H)
- Privileges Required (PR): None (N)
- User Interaction (UI): None (N)
- Scope (S): Unchanged (U)
- Confidentiality (C): None (N)
- Integrity (I): None (N)
- Availability (A): High (H)
- Modified Attack Vector (MAV): Network (N)
- Modified Attack Complexity (MAC): High (H)
- Modified Privileges Required (MPR): None (N)
- Modified User Interaction (MUI): None (N)
- Modified Confidentiality (MC): None (N)
- Modified Scope (MS): Unchanged (U)
- Modified Integrity (MI): None (N)
- Modified Availability (MA): High (H)
Activity log
- Created suggestion
h2o is vulnerable to heap overrun
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.
References
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https://github.com/h2o/h2o/security/advisories/GHSA-w68q-rqwx-7wvq x_refsource_CONFIRM
Affected products
h2o
- ==< 8dc37cb
Matching in nixpkgs
pkgs.h2o
Optimized HTTP/1.x, HTTP/2, HTTP/3 server
-
nixos-unstable -
- nixos-unstable-small 2.3.0-rolling-2026-06-29
-
nixos-26.05 -
- nixos-26.05-small 2.3.0-rolling-2026-05-15
Package maintainers
-
@thoughtpolice Austin Seipp <aseipp@pobox.com>
-
@toastal toastal <toastal+nix@posteo.net>