Description
A double free vulnerability exists in libcurl <8.0.0 when sharing HSTS data between separate "handles". This sharing was introduced without considerations for do this sharing across separate threads but there was no indication of this fact in the documentation. Due to missing mutexes or thread locks, two threads sharing the same HSTS data could end up doing a double-free or use-after-free.
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 | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | curl | 8.0.1-1.1 | openSUSE-SU-2024:12812-1 |
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) | mysql | 8.0.33-1 | — |
| Azure Linux 2 (CBL-Mariner) | rust | 1.72.0-2 | — |
Advisories 10
- 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-2023-1350 Splunk Splunk Enterprise: Mehrere Schwachstellen in Komponenten von Drittanbietern BSI CERT-Bund (WID) · Jul 1, 2026
- openSUSE-SU-2024:12812-1 curl-8.0.1-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2023-2229 Splunk Splunk Enterprise: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 18, 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
- 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