Description
A flaw in libcurl makes it wrongly reuse an HTTP connection setup for a given
hostname using Negotiate authentication, when the initial request is done
using empty credentials. This can make user B's request get sent over user A's
previously authenticated connection.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| curl | curl | 7.64.1 – < 8.14.2, 8.15.0 – < 8.16.1, 8.17.0 – < 8.20.1, 8.21.0 – < 8.22.0, 8.21.0, 8.20.0, 8.19.0, 8.18.0, 8.17.0, 8.16.0, 8.15.0, 8.14.1, 8.14.0, 8.13.0, 8.12.1, 8.12.0, 8.11.1, 8.11.0, 8.10.1, 8.10.0, 8.9.1, 8.9.0, 8.8.0, 8.7.1, 8.7.0, 8.6.0, 8.5.0, 8.4.0, 8.3.0, 8.2.1, 8.2.0, 8.1.2, 8.1.1, 8.1.… | 8.14.2 |
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 | 8.22.0~rc2-1 | — |
| Debian 13 | curl | No fix yet | — |
| Debian 12 | curl | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | curl +3 | 8.22.0-0.1.hum1 | RHSA-2026:63161 |
| Red Hat Hardened Images 1 | rust +18 | 1.98.0-1.hum1 | RHSA-2026:63514 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | curl | 8.22.0-150700.7.33.1 | SUSE-SU-2026:5068-1 |
| SLES 15 SP6 | curl | 8.22.0-150600.4.58.1 | SUSE-SU-2026:5069-1 |
| SLES 15 SP5 | curl | 8.14.1-150400.5.98.1 | SUSE-SU-2026:4954-1 |
| SLES 15 SP4 | curl | 8.14.1-150400.5.98.1 | SUSE-SU-2026:4954-1 |
| SLES 12 SP5 | curl | 8.0.1-11.134.1 | SUSE-SU-2026:5071-1 |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP6 | curl | 8.22.0-150600.4.58.1 | SUSE-SU-2026:5069-1 |
| SLE Micro 5.5 | curl | 8.14.1-150400.5.98.1 | SUSE-SU-2026:4954-1 |
| SLE Micro 5.4 | curl | 8.14.1-150400.5.98.1 | SUSE-SU-2026:4954-1 |
| SLE Micro 5.3 | curl | 8.14.1-150400.5.98.1 | SUSE-SU-2026:4954-1 |
| SLE HPC 15 SP5 | curl | 8.14.1-150400.5.98.1 | SUSE-SU-2026:4954-1 |
| SLE HPC 15 SP4 | curl | 8.14.1-150400.5.98.1 | SUSE-SU-2026:4954-1 |
| SUSE Linux Enterprise Installer Updates 15 SP5 | curl | 8.14.1-150400.5.98.1 | SUSE-SU-2026:4954-1 |
| SUSE Linux Enterprise Installer Updates 15 SP4 | curl | 8.14.1-150400.5.98.1 | SUSE-SU-2026:4954-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | curl | 8.22.0-1.1 | openSUSE-SU-2026:11696-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | curl | 8.22.0-r0 | — |
| Alpine v3.23 | curl | 8.22.0-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | curl +4 | 8.21.0-5.amzn2023.0.4 | ALAS2023-2026-3404 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | curl | 8.11.1-12 | — |
| Azure Linux 3 | rust +3 | No fix yet | — |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | curl | 8.22.0-r0 | — |
Advisories 10
- WID-SEC-2026-3149 cURL: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 12, 2026
- ALAS2023-2026-3404 Moderate: curl security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Nov 9, 2026
- SUSE-SU-2026:5069-1 Security update for curl SUSE / openSUSE Security Updates · Nov 3, 2026
- SUSE-SU-2026:5068-1 Security update for curl SUSE / openSUSE Security Updates · Nov 3, 2026
- SUSE-SU-2026:5071-1 Security update for curl SUSE / openSUSE Security Updates · Nov 3, 2026
- SUSE-SU-2026:4954-1 Security update for curl SUSE / openSUSE Security Updates · Nov 2, 2026
- RHSA-2026:63161 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- WID-SEC-2026-3642 Meinberg LANTIME: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 14, 2026
- RHSA-2026:63514 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Sep 23, 2026
- openSUSE-SU-2026:11696-1 curl-8.22.0-1.1 on GA media SUSE / openSUSE Security Updates · Sep 8, 2026