Description
The default configuration for cURL and libcurl before 7.42.1 sends custom HTTP headers to both the proxy and destination server, which might allow remote proxy servers to obtain sensitive information by reading the header contents.
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 | 7.42.1-1 | — |
| Debian 13 | curl | 7.42.1-1 | — |
| Debian 12 | curl | 7.42.1-1 | — |
| Debian 8 | curl | 7.38.0-4+deb8u2 | DSA-3240-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | curl | 7.35.0-1ubuntu2.5 | USN-2591-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 14.04 LTS | curl | No fix yet | — |
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
- DSA-3240-1 curl - security update Debian Security (DSA / DLA) · Mar 9, 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
References
- https://kc.mcafee.com/corporate/index?page=content&id=SB10131
- 1032233 vdb-entry
- http://www.oracle.com/technetwork/topics/security/cpuoct2015-2367953.html
- http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html
- USN-2591-1 vendor-advisory
- openSUSE-SU-2015:0861 vendor-advisory
- 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
- https://support.apple.com/kb/HT205031
- 74408 vdb-entry
- http://curl.haxx.se/docs/adv_20150429.html
- DSA-3240 vendor-advisory