High severity8.2NVD Advisory· Published Apr 27, 2023· Updated Jun 17, 2026
CVE-2023-30847
CVE-2023-30847
Description
H2O is an HTTP server. In versions 2.3.0-beta2 and prior, when the reverse proxy handler tries to processes a certain type of invalid HTTP request, it tries to build an upstream URL by reading from uninitialized pointer. This behavior can lead to crashes or leak of information to back end HTTP servers. Pull request number 3229 fixes the issue. The pull request has been merged to the master branch in commit f010336. Users should upgrade to commit f010336 or later.
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Affected products
4cpe:2.3:a:dena:h2o:*:*:*:*:*:*:*:*+ 2 more
- cpe:2.3:a:dena:h2o:*:*:*:*:*:*:*:*range: <=2.2.6
- cpe:2.3:a:dena:h2o:2.3.0:beta1:*:*:*:*:*:*
- cpe:2.3:a:dena:h2o:2.3.0:beta2:*:*:*:*:*:*
- h2o/h2ov5Range: <= 2.3.0-beta2
Patches
Vulnerability mechanics
References
3- github.com/h2o/h2o/commit/f010336bab162839df43d9e87570897466c97e33nvdPatch
- github.com/h2o/h2o/security/advisories/GHSA-p5hj-phwj-hrvxnvdPatchVendor Advisory
- github.com/h2o/h2o/pull/3229nvdVendor Advisory
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