Description
curl and libcurl before 7.50.1 do not prevent TLS session resumption when the client certificate has changed, which allows remote attackers to bypass intended restrictions by resuming a session.
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 | 7.50.1-1 | — |
| Debian 13 | curl | 7.50.1-1 | — |
| Debian 12 | curl | 7.50.1-1 | — |
| Debian 8 | curl | 7.38.0-4+deb8u4 | DSA-3638-1 |
| Debian 7 | curl | 7.26.0-1+wheezy14 | DLA-586-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | curl | 7.47.0-1ubuntu2.1 | USN-3048-1 |
| Ubuntu 14.04 LTS | curl | 7.35.0-1ubuntu2.8 | USN-3048-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | curl +2 | 7.29.0-35.el7 | RHSA-2016:2575 |
| RHEL 3 | httpd24-curl +2 | 7.61.1-1.el6 | RHSA-2018:3558 |
| RHEL 3 | httpd24-httpd +5 | 2.4.34-7.el6 | RHSA-2018:3558 |
| RHEL 3 | httpd24-mod_md | 2.4.34-7.el7 | RHSA-2018:3558 |
| RHEL 3 | httpd24-mod_ssl +1 | 1:2.4.34-7.el6 | RHSA-2018:3558 |
| RHEL 3 | httpd24-nghttp2 +2 | 1.7.1-7.el6 | RHSA-2018:3558 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP1 | curl | 7.37.0-28.1 | SUSE-SU-2016:2330-1 |
| SLES 11 SP4 | curl | 7.19.7-1.61.1 | SUSE-SU-2016:2449-1 |
| SLES 11 SP3 | curl +1 | 7.19.7-1.61.1 | SUSE-SU-2016:2449-1 |
| SLES 11 | curl-openssl1 | 7.19.7-1.61.1 | SUSE-SU-2016:2449-1 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SUSE Studio Onsite 1.3 | curl | 7.19.7-1.20.42.1 | SUSE-SU-2016:2155-1 |
| SLES for SAP 12 SP1 | curl | 7.37.0-28.1 | SUSE-SU-2016:2330-1 |
| SLES for SAP 11 SP4 | curl | 7.19.7-1.61.1 | SUSE-SU-2016:2449-1 |
| SUSE OpenStack Cloud 5 | curl | 7.19.7-1.61.1 | SUSE-SU-2016:2449-1 |
| SUSE Manager Proxy 2.1 | curl | 7.19.7-1.61.1 | SUSE-SU-2016:2449-1 |
| SUSE Manager 2.1 | curl | 7.19.7-1.61.1 | SUSE-SU-2016:2449-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | curl | 7.19.7-1.61.1 | SUSE-SU-2016:2449-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | curl | 7.50.1-r0 | — |
| Alpine v3.23 | curl | 7.50.1-r0 | — |
| Alpine v3.22 | curl | 7.50.1-r0 | — |
| Alpine v3.21 | curl | 7.50.1-r0 | — |
| Alpine v3.20 | curl | 7.50.1-r0 | — |
Show 18 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | curl | 7.50.1-r0 | — |
| Alpine v3.18 | curl | 7.50.1-r0 | — |
| Alpine v3.17 | curl | 7.50.1-r0 | — |
| Alpine v3.16 | curl | 7.50.1-r0 | — |
| Alpine v3.15 | curl | 7.50.1-r0 | — |
| Alpine v3.14 | curl | 7.50.1-r0 | — |
| Alpine v3.13 | curl | 7.50.1-r0 | — |
| Alpine v3.12 | curl | 7.50.1-r0 | — |
| Alpine v3.11 | curl | 7.50.1 | — |
| Alpine v3.10 | curl | 7.50.1-r0 | — |
| Alpine v3.9 | curl | 7.50.1-r0 | — |
| Alpine v3.8 | curl | 7.50.1 | — |
| Alpine v3.7 | curl | 7.50.1 | — |
| Alpine v3.6 | curl | 7.50.1 | — |
| Alpine v3.5 | curl | 7.50.1-r0 | — |
| Alpine v3.4 | curl | 7.50.1-r0 | — |
| Alpine v3.3 | curl | 7.49.1-r1 | — |
| Alpine v3.2 | curl | 7.49.1-r1 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | curl +2 | 7.29.0-35.el7 | ELSA-2016-2575 |
Advisories 10
- RHSA-2018:3558 Red Hat Security Advisory: httpd24 security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Sep 21, 2026
- RHSA-2016:2575 Red Hat Security Advisory: curl security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Sep 21, 2026
- USN-3048-1 curl vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DLA-586-1 curl - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-3638-1 curl - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2016:2449-1 Security update for curl SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:2155-1 Security update for curl SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:2330-1 Security update for curl SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2026-0180 Dell Data Protection Advisor: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jan 20, 2026
- ELSA-2016-2575 Moderate: curl security, bug fix, and enhancement update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Nov 9, 2016
References
- RHSA-2016:2575 vendor-advisory
- 92319 vdb-entry
- 92292 vdb-entry
- https://curl.haxx.se/docs/adv_20160803A.html
- RHSA-2018:3558 vendor-advisory
- https://source.android.com/security/bulletin/2016-12-01.html
- 1038341 vdb-entry
- SSA:2016-219-01 vendor-advisory
- DSA-3638 vendor-advisory
- 1036538 vdb-entry
- openSUSE-SU-2016:2227 vendor-advisory
- https://www.tenable.com/security/tns-2016-18
- openSUSE-SU-2016:2379 vendor-advisory
- FEDORA-2016-24316f1f56 vendor-advisory
- http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
- FEDORA-2016-8354baae0f vendor-advisory
- RHSA-2016:2957 vendor-advisory
- GLSA-201701-47 vendor-advisory
- USN-3048-1 vendor-advisory