Description
curl before version 7.51.0 uses outdated IDNA 2003 standard to handle International Domain Names and this may lead users to potentially and unknowingly issue network transfer requests to the wrong host.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| The Curl Project | curl | 7.51.0 | — |
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 | 7.51.0-1 | — |
| Debian 13 | curl | 7.51.0-1 | — |
| Debian 12 | curl | 7.51.0-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 16.04 LTS | curl | No fix yet | — |
| Ubuntu Pro 14.04 LTS | curl | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| 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 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | curl | 7.51.0-1.1 | openSUSE-SU-2024:10303-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | curl | 7.51.0-r0 | — |
| Alpine v3.23 | curl | 7.51.0-r0 | — |
| Alpine v3.22 | curl | 7.51.0-r0 | — |
| Alpine v3.21 | curl | 7.51.0-r0 | — |
| Alpine v3.20 | curl | 7.51.0-r0 | — |
Show 16 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | curl | 7.51.0-r0 | — |
| Alpine v3.18 | curl | 7.51.0-r0 | — |
| Alpine v3.17 | curl | 7.51.0-r0 | — |
| Alpine v3.16 | curl | 7.51.0-r0 | — |
| Alpine v3.15 | curl | 7.51.0-r0 | — |
| Alpine v3.14 | curl | 7.51.0-r0 | — |
| Alpine v3.13 | curl | 7.51.0-r0 | — |
| Alpine v3.12 | curl | 7.51.0-r0 | — |
| Alpine v3.11 | curl | 7.51.0 | — |
| Alpine v3.10 | curl | 7.51.0-r0 | — |
| Alpine v3.9 | curl | 7.51.0-r0 | — |
| Alpine v3.8 | curl | 7.51.0 | — |
| Alpine v3.7 | curl | 7.51.0 | — |
| Alpine v3.6 | curl | 7.51.0 | — |
| Alpine v3.5 | curl | 7.51.0-r0 | — |
| Alpine v3.4 | curl | 7.51.0-r0 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | curl +2 | 7.29.0-51.0.1.el7 | ELSA-2019-4652 |
Advisories 5
- RHSA-2018:3558 Red Hat Security Advisory: httpd24 security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Sep 21, 2026
- openSUSE-SU-2024:10303-1 curl-7.51.0-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2026-0180 Dell Data Protection Advisor: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jan 20, 2026
- WID-SEC-2023-1652 cURL: Mehrere Schwachstellen BSI CERT-Bund (WID) · Dec 13, 2023
- ELSA-2019-4652 Important: curl security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · May 21, 2019
References
- 94107 vdb-entry
- https://curl.haxx.se/CVE-2016-8625.patch
- RHSA-2018:3558 vendor-advisory
- https://www.tenable.com/security/tns-2016-21
- https://curl.haxx.se/docs/adv_20161102K.html
- 1037192 vdb-entry
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-8625
- RHSA-2018:2486 vendor-advisory
- GLSA-201701-47 vendor-advisory
- [bookkeeper-issues] 20210628 [GitHub] [bookkeeper] padma81 opened a new issue #2746: Security Vulnerabilities in CentOS 7 image, Upgrade image to CentOS 8 mailing-list
- [bookkeeper-issues] 20210629 [GitHub] [bookkeeper] padma81 opened a new issue #2746: Security Vulnerabilities in CentOS 7 image, Upgrade image to CentOS 8 mailing-list