Description
The fix_hostname function in cURL and libcurl 7.37.0 through 7.41.0 does not properly calculate an index, which allows remote attackers to cause a denial of service (out-of-bounds read or write and crash) or possibly have other unspecified impact via a zero-length host name, as demonstrated by "http://:80" and ":80."
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | curl | 7.42.0-1 | — |
| Debian 13 | curl | 7.42.0-1 | — |
| Debian 12 | curl | 7.42.0-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | curl | 7.35.0-1ubuntu2.5 | USN-2591-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 | curl | 7.37.0-15.1 | SUSE-SU-2015:0990-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 | curl | 7.37.0-15.1 | SUSE-SU-2015:0990-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | curl | 7.51.0-1.1 | openSUSE-SU-2024:10303-1 |
Advisories 4
- USN-2591-1 curl vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- SUSE-SU-2015:0990-1 Security update for curl SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10303-1 curl-7.51.0-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2024-1483 Oracle MySQL: Mehrere Schwachstellen gefährden die Integrität, Vertraulichkeit und Verfügbarkeit BSI CERT-Bund (WID) · Jun 30, 2024
References
- FEDORA-2015-6853 vendor-advisory
- http://www.oracle.com/technetwork/topics/security/cpuoct2015-2367953.html
- DSA-3232 vendor-advisory
- 74300 vdb-entry
- USN-2591-1 vendor-advisory
- 1032232 vdb-entry
- APPLE-SA-2015-08-13-2 vendor-advisory
- http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
- http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10743
- http://www.oracle.com/technetwork/topics/security/bulletinjan2016-2867206.html
- openSUSE-SU-2015:0799 vendor-advisory
- https://support.apple.com/kb/HT205031
- GLSA-201509-02 vendor-advisory
- http://curl.haxx.se/docs/adv_20150422D.html
- FEDORA-2015-6728 vendor-advisory
- FEDORA-2015-6695 vendor-advisory
- FEDORA-2015-6864 vendor-advisory