Description
When doing TLS related transfers with reused easy or multi handles and
altering the `CURLSSLOPT_NO_PARTIALCHAIN` option, libcurl could accidentally
reuse a CA store cached in memory for which the partial chain option was
reversed. Contrary to the user's wishes and expectations. This could make
libcurl find and accept a trust chain that it otherwise would not.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| curl | curl | 7.87.0 – < 8.14.2, 8.15.0 – < 8.16.1, 8.17.0 – < 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, 8.1.0, 8.0.1, 8.0.0, 7.88.1, 7.88.0, 7.87.0 | 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 | 8.18.0~rc3-1 | — |
| Debian 13 | curl | 8.14.1-2+deb13u4 | — |
| Debian 12 | curl | 7.88.1-10+deb12u15 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 25.10 | curl | 8.14.1-2ubuntu1.1 | USN-8062-1 |
| Ubuntu 24.04 LTS | curl | 8.5.0-2ubuntu10.7 | USN-8062-1 |
| Ubuntu 22.04 LTS | curl | 7.81.0-1ubuntu1.22 | USN-8062-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | curl +3 | 8.12.1-4.el10_2.3 | RHSA-2026:55450 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10.0 EUS | curl +3 | 8.12.1-1.el10_0.10 | RHSA-2026:72506 |
| Red Hat Hardened Images 1 | curl +3 | 8.19.0-3.hum1 | RHSA-2026:82895, RHSA-2026:77255, RHSA-2026:6893 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | curl | 8.14.1-150700.7.8.1 | SUSE-SU-2026:0052-1 |
| SLES 12 SP5 | curl | 8.0.1-11.111.1 | SUSE-SU-2026:0066-1 |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | curl +1 | 8.14.1-160000.4.1 | SUSE-SU-2026:20082-1 |
| SLES 16.0 | curl +1 | 8.14.1-160000.4.1 | SUSE-SU-2026:20082-1 |
| SLE Micro 6.2 | curl | 8.14.1-160000.4.1 | SUSE-SU-2026:20110-1 |
| SLE Micro 6.1 | curl | 8.14.1-slfo.1.1_4.1 | SUSE-SU-2026:20062-1 |
| SLE Micro 6.0 | curl | 8.14.1-3.1 | SUSE-SU-2026:20042-1 |
| SLE Micro 5.5 | curl | 8.14.1-150400.5.77.1 | SUSE-SU-2026:0508-1 |
| SLE Micro 5.4 | curl | 8.14.1-150400.5.77.1 | SUSE-SU-2026:0508-1 |
| SLE Micro 5.3 | curl | 8.14.1-150400.5.77.1 | SUSE-SU-2026:0508-1 |
| SLE Micro 5.2 | curl | 8.14.1-150200.4.97.1 | SUSE-SU-2026:0051-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | curl | 8.18.0-1.1 | openSUSE-SU-2026:10017-1 |
| openSUSE Leap 16.0 | curl | 8.14.1-160000.4.1 | openSUSE-SU-2026:20031-1 |
| openSUSE Leap 15.6 | curl | 8.14.1-150600.4.34.1 | SUSE-SU-2026:0050-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | curl | 8.18.0-r0 | — |
| Alpine v3.23 | curl | 8.18.0-r0 | — |
| Alpine v3.22 | curl | 8.14.1-r4 | — |
| Alpine v3.21 | curl | 8.14.1-r3 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | curl +4 | 8.17.0-1.amzn2023.0.1 | ALAS2023-2026-1375 |
| Amazon Linux 2 | curl +2 | 8.3.0-1.amzn2.0.12 | ALAS2-2026-3173 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | curl +3 | 8.12.1-4.el10_2.4 | ELSA-2026-55450 |
Advisories 23
- RHSA-2026:77255 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- WID-SEC-2026-0030 cURL: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 11, 2026
- WID-SEC-2026-2189 Dell PowerProtect Data Domain: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 2, 2026
- WID-SEC-2026-2929 Splunk Splunk Enterprise: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 21, 2026
- RHSA-2026:82895 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 18, 2026
- RHSA-2026:72506 Red Hat Security Advisory: curl security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:6893 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:55450 Red Hat Security Advisory: curl security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- ELSA-2026-55450 Important: curl security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Aug 17, 2026
- USN-8062-1 curl vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- openSUSE-SU-2026:20031-1 Security update for curl SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2026:10017-1 curl-8.18.0-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:20082-1 Security update for curl SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:20062-1 Security update for curl SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:20042-1 Security update for curl SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0508-1 Security update for curl SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0051-1 Security update for curl SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0050-1 Security update for curl SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0066-1 Security update for curl SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0052-1 Security update for curl SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:20110-1 Security update for curl SUSE / openSUSE Security Updates · Mar 23, 2026
- ALAS2023-2026-1375 Moderate: curl security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Feb 20, 2026
- ALAS2-2026-3173 Moderate: curl security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Feb 18, 2026