CVE catalog
CVE-2023-30847
h2o: CVE-2023-30847
- Severity
- Low
- Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.90% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | h2o | bookworm | 2.2.5+dfsg2-7 | not affected |
| Ubuntu | h2o | pro | 2.2.5+dfsg2-6 | vulnerable |
| Ubuntu | h2o | pro | 2.2.5+dfsg2-6.1 | vulnerable |
| Ubuntu | h2o | pro | 2.2.5+dfsg2-6.1ubuntu1 | vulnerable |
| Ubuntu | h2o | pro | 2.2.5+dfsg2-6.1ubuntu2 | vulnerable |
| Ubuntu | h2o | pro | 2.2.5+dfsg2-6.1ubuntu2+esm1 | vulnerable |
| Ubuntu | h2o | 24.04 | 2.2.5+dfsg2-7 | vulnerable |
| Ubuntu | h2o | 24.04 | 2.2.5+dfsg2-8 | vulnerable |
| Ubuntu | h2o | 24.04 | 2.2.5+dfsg2-8.1ubuntu1 | vulnerable |
| Ubuntu | h2o | 24.04 | 2.2.5+dfsg2-8.1ubuntu2 | vulnerable |
| Ubuntu | h2o | 24.04 | 2.2.5+dfsg2-8.1ubuntu3 | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | h2o | source | bookworm | Not affected | unimportant | Not reported | Not reported |
OpenFactory catalog packages
Matching against OpenFactory catalog package versions is in progress.