Description
An authentication bypass vulnerability exists in libcurl prior to v8.0.0 where it reuses a previously established SSH connection despite the fact that an SSH option was modified, which should have prevented reuse. libcurl maintains a pool of previously used connections to reuse them for subsequent transfers if the configurations match. However, two SSH settings were omitted from the configuration check, allowing them to match easily, potentially leading to the reuse of an inappropriate connection.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | https://github.com/curl/curl | Fixed in 8.0.0 | — |
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 | 7.88.1-7 | — |
| Debian 13 | curl | 7.88.1-7 | — |
| Debian 12 | curl | 7.88.1-7 | — |
| Debian 10 | curl | 7.64.0-4+deb10u6 | DLA-3398-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | curl | 7.81.0-1ubuntu1.10 | USN-5964-1 |
| Ubuntu 20.04 LTS | curl | 7.68.0-1ubuntu2.18 | USN-5964-1 |
| Ubuntu 18.04 LTS | curl | 7.58.0-2ubuntu3.24 | USN-5964-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | curl +4 | 7.76.1-26.el9 | RHSA-2023:6679 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | curl +4 | 7.76.1-26.el9 | ALSA-2023:6679 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP4 | curl | 7.79.1-150400.5.18.1 | SUSE-SU-2023:1582-1 |
| SLES 15 SP1 | curl | 7.60.0-150000.51.1 | SUSE-SU-2023:2226-1 |
| SLES 12 SP5 | curl | 7.60.0-11.60.1 | SUSE-SU-2023:0865-1 |
| SLES 12 SP4 | curl | 7.60.0-4.56.1 | SUSE-SU-2023:2228-1 |
Show 11 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP1 | curl | 7.60.0-150000.51.1 | SUSE-SU-2023:2226-1 |
| SLES for SAP 12 SP5 | curl | 7.60.0-11.60.1 | SUSE-SU-2023:0865-1 |
| SLES for SAP 12 SP4 | curl | 7.60.0-4.56.1 | SUSE-SU-2023:2228-1 |
| SLE Real Time 15 SP3 | curl | 7.66.0-150200.4.52.1 | SUSE-SU-2023:1711-1 |
| SLE Micro 5.3 | curl | 7.79.1-150400.5.18.1 | SUSE-SU-2023:1582-1 |
| SLE Micro 5.2 | curl | 7.66.0-150200.4.52.1 | SUSE-SU-2023:1711-1 |
| SLE Micro 5.1 | curl | 7.66.0-150200.4.52.1 | SUSE-SU-2023:1711-1 |
| SLE HPC 15 SP1 | curl | 7.60.0-150000.51.1 | SUSE-SU-2023:2226-1 |
| SUSE OpenStack Cloud Crowbar 9 | curl | 7.60.0-4.56.1 | SUSE-SU-2023:2228-1 |
| SUSE OpenStack Cloud 9 | curl | 7.60.0-4.56.1 | SUSE-SU-2023:2228-1 |
| SUSE Enterprise Storage 6 | curl | 7.60.0-150000.51.1 | SUSE-SU-2023:2226-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | curl | 8.0.1-1.1 | openSUSE-SU-2024:12812-1 |
| openSUSE Leap 15.4 | curl | 7.79.1-150400.5.18.1 | SUSE-SU-2023:1582-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap Micro 5.3 | curl | 7.79.1-150400.5.18.1 | SUSE-SU-2023:1582-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | curl | 8.0.0-r0 | — |
| Alpine v3.23 | curl | 8.0.0-r0 | — |
| Alpine v3.22 | curl | 8.0.0-r0 | — |
| Alpine v3.21 | curl | 8.0.0-r0 | — |
| Alpine v3.20 | curl | 8.0.0-r0 | — |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | curl | 8.0.0-r0 | — |
| Alpine v3.18 | curl | 8.0.0-r0 | — |
| Alpine v3.17 | curl | 7.88.1-r1 | — |
| Alpine v3.16 | curl | 8.0.1-r0 | — |
| Alpine v3.15 | curl | 8.0.1-r0 | — |
| Alpine v3.14 | curl | 8.0.1-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | curl +4 | 8.0.1-1.amzn2023 | ALAS2023-2023-193 |
| Amazon Linux 2 | curl +2 | 8.0.1-1.amzn2.0.1 | ALAS2-2023-2070 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | cmake | 3.28.2-1 | — |
| Azure Linux 3 | tensorflow | 2.16.1-1 | — |
| Azure Linux 2 (CBL-Mariner) | cmake | 3.21.4-13 | — |
| Azure Linux 2 (CBL-Mariner) | curl | 8.0.1-1 | — |
| Azure Linux 2 (CBL-Mariner) | mysql | 8.0.34-1 | — |
| Azure Linux 2 (CBL-Mariner) | rust | 1.72.0-2 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | curl +4 | 7.76.1-26.el9 | ELSA-2023-6679 |
Advisories 26
- ALSA-2023:6679 Moderate: curl security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2023:6679 Red Hat Security Advisory: curl security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- SSA-398330 SSA-398330: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP >= V3.1.0 and < V3.1.5 Siemens ProductCERT · Oct 13, 2026
- WID-SEC-2023-0690 cURL: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 10, 2026
- WID-SEC-2024-0794 Dell ECS: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 11, 2026
- WID-SEC-2023-1350 Splunk Splunk Enterprise: Mehrere Schwachstellen in Komponenten von Drittanbietern BSI CERT-Bund (WID) · Jul 1, 2026
- USN-5964-1 curl vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DLA-3398-1 curl - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2023:2226-1 Security update for curl SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:1582-1 Security update for curl SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:0865-1 Security update for curl SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:2228-1 Security update for curl SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:1711-1 Security update for curl SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:12812-1 curl-8.0.1-1.1 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-2023-2229 Splunk Splunk Enterprise: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 18, 2025
- WID-SEC-2024-3377 Dell PowerProtect Data Domain: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 12, 2025
- ICSA-23-348-10 Siemens SIMATIC S7-1500 CISA ICS & IT advisories · Aug 12, 2025
- ICSA-24-046-15 Siemens SINEC NMS CISA ICS & IT advisories · Mar 12, 2024
- SSA-943925 SSA-943925: Multiple Vulnerabilities in SINEC NMS before V2.0 SP1 Siemens ProductCERT · Mar 12, 2024
- ICSA-23-348-16 Siemens SINEC INS CISA ICS & IT advisories · Dec 12, 2023
- SSA-077170 SSA-077170: Multiple Vulnerabilities in SINEC INS before V1.0 SP2 Update 2 Siemens ProductCERT · Dec 12, 2023
- ELSA-2023-6679 Moderate: curl security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Nov 11, 2023
- WID-SEC-2023-1614 Tenable Security Nessus Network Monitor: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 25, 2023
- ALAS2-2023-2070 Moderate: curl security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jun 7, 2023
- ALAS2023-2023-193 Moderate: curl security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Jun 7, 2023