Description
When performing transfers via libcurl’s multi interface, pooled TLS
connections can outlive their originating easy handles. In OpenSSL 3 provider
configurations, libcurl attaches an allocated library context to the easy
handle's state and passes it to OpenSSL without acquiring an ownership
reference; destroying the easy handle prematurely frees this context while the
active connection retains a dangling pointer, leading to a heap-use-after-free
upon subsequent I/O or post-handshake operations.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| curl | curl | 8.14.0 – < 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 | 8.14.2 |
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~rc3-1 | — |
| Debian 13 | curl | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | curl | 8.20.0-2ubuntu11 | — |
| Ubuntu 26.04 LTS | curl | 8.18.0-1ubuntu2.7 | USN-8820-1 |
| Ubuntu 24.04 LTS | curl | 8.5.0-2ubuntu10.15 | USN-8820-1 |
| Ubuntu 22.04 LTS | curl | 7.81.0-1ubuntu1.29 | USN-8820-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | curl | 7.68.0-1ubuntu2.25+esm9 | USN-8820-1 |
| Ubuntu Pro 18.04 LTS | curl | 7.58.0-2ubuntu3.24+esm14 | USN-8820-1 |
| Ubuntu Pro 16.04 LTS | curl | 7.47.0-1ubuntu2.19+esm20 | USN-8820-1 |
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 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | curl | 8.14.1-150700.7.26.1 | SUSE-SU-2026:4048-1 |
| SLES 15 SP6 | curl | 8.14.1-150600.4.51.1 | SUSE-SU-2026:4047-1 |
| SLES 12 SP5 | curl | 8.0.1-11.129.1 | SUSE-SU-2026:4071-1 |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | curl +1 | 8.14.1-160000.9.1 | SUSE-SU-2026:23638-1 |
| SLES for SAP 15 SP6 | curl | 8.14.1-150600.4.51.1 | SUSE-SU-2026:4047-1 |
| SLES 16.0 | curl +1 | 8.14.1-160000.9.1 | SUSE-SU-2026:23638-1 |
| SLE Micro 6.2 | curl | 8.14.1-160000.9.1 | SUSE-SU-2026:23498-1 |
| SLE Micro 6.1 | curl | 8.14.1-slfo.1.1_10.1 | SUSE-SU-2026:23521-1 |
| SLE Micro 5.5 | curl | 8.14.1-150400.5.91.1 | SUSE-SU-2026:3958-1 |
| SLE Micro 5.4 | curl | 8.14.1-150400.5.91.1 | SUSE-SU-2026:3958-1 |
| SLE Micro 5.3 | curl | 8.14.1-150400.5.91.1 | SUSE-SU-2026:3958-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | curl | 8.22.0-1.1 | openSUSE-SU-2026:11696-1 |
| openSUSE Leap 16.0 | curl | 8.14.1-160000.9.1 | openSUSE-SU-2026:21774-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | curl | 8.22.0-r0 | — |
| Alpine v3.23 | curl | 8.22.0-r0 | — |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | rust +1 | No fix yet | — |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | curl | 8.22.0-r0 | — |
Advisories 13
- WID-SEC-2026-3149 cURL: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 12, 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
- SUSE-SU-2026:23638-1 Security update for curl SUSE / openSUSE Security Updates · Sep 29, 2026
- USN-8820-1 curl vulnerabilities Ubuntu Security Notices (USN) · Sep 26, 2026
- SUSE-SU-2026:23521-1 Security update for curl SUSE / openSUSE Security Updates · Sep 15, 2026
- SUSE-SU-2026:23498-1 Security update for curl SUSE / openSUSE Security Updates · Sep 14, 2026
- SUSE-SU-2026:4071-1 Security update for curl SUSE / openSUSE Security Updates · Sep 13, 2026
- SUSE-SU-2026:4047-1 Security update for curl SUSE / openSUSE Security Updates · Sep 13, 2026
- SUSE-SU-2026:4048-1 Security update for curl SUSE / openSUSE Security Updates · Sep 13, 2026
- SUSE-SU-2026:3958-1 Security update for curl SUSE / openSUSE Security Updates · Sep 13, 2026
- openSUSE-SU-2026:21774-1 Security update for curl SUSE / openSUSE Security Updates · Sep 9, 2026
- openSUSE-SU-2026:11696-1 curl-8.22.0-1.1 on GA media SUSE / openSUSE Security Updates · Sep 8, 2026