Description
A cleartext transmission of sensitive information vulnerability exists in curl <v7.88.0 that could cause HSTS functionality to behave incorrectly when multiple URLs are requested in parallel. Using its HSTS support, curl can be instructed to use HTTPS instead of using an insecure clear-text HTTP step even when HTTP is provided in the URL. This HSTS mechanism would however surprisingly fail when multiple transfers are done in parallel as the HSTS cache file gets overwritten by the most recentlycompleted transfer. A later HTTP-only transfer to the earlier host name would then *not* get upgraded properly to HSTS.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | https://github.com/curl/curl | Fixed in 7.88.0 | — |
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 | 7.88.1-1 | — |
| Debian 13 | curl | 7.88.1-1 | — |
| Debian 12 | curl | 7.88.1-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | curl | 7.81.0-1ubuntu1.8 | USN-5891-1 |
| Ubuntu 20.04 LTS | curl | 7.68.0-1ubuntu2.16 | USN-5891-1 |
| Ubuntu 18.04 LTS | curl | 7.58.0-2ubuntu3.23 | USN-5891-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat JBoss Core Services 1 | jbcs-httpd24-apr-util +8 | 1.6.1-101.el7jbcs | RHSA-2023:3354 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-curl +2 | 8.0.1-1.el7jbcs | RHSA-2023:3354 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-httpd +6 | 2.4.51-39.el7jbcs | RHSA-2023:3354 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_ssl +1 | 1:2.4.51-39.el7jbcs | RHSA-2023:3354 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-openssl +4 | 1:1.1.1k-14.el7jbcs | RHSA-2023:3354 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP4 | curl | 7.79.1-150400.5.15.1 | SUSE-SU-2023:0429-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLE Micro 5.3 | curl | 7.79.1-150400.5.15.1 | SUSE-SU-2023:0429-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | curl | 7.88.1-1.1 | openSUSE-SU-2024:12735-1 |
| openSUSE Leap 15.4 | curl | 7.79.1-150400.5.15.1 | SUSE-SU-2023:0429-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap Micro 5.3 | curl | 7.79.1-150400.5.15.1 | SUSE-SU-2023:0429-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | curl | 7.88.0-r0 | — |
| Alpine v3.23 | curl | 7.88.0-r0 | — |
| Alpine v3.22 | curl | 7.88.0-r0 | — |
| Alpine v3.21 | curl | 7.88.0-r0 | — |
| Alpine v3.20 | curl | 7.88.0-r0 | — |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | curl | 7.88.0-r0 | — |
| Alpine v3.18 | curl | 7.88.0-r0 | — |
| Alpine v3.17 | curl | 7.87.0-r2 | — |
| Alpine v3.16 | curl | 7.83.1-r6 | — |
| Alpine v3.15 | curl | 7.80.0-r6 | — |
| Alpine v3.14 | curl | 7.79.1-r5 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | curl +4 | 7.88.0-1.amzn2023.0.1 | ALAS2023-2023-114 |
| Amazon Linux 2 | curl +2 | 7.88.0-1.amzn2.0.1 | ALAS2-2023-1986 |
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 | 3.21.4-5 | — |
| Azure Linux 2 (CBL-Mariner) | curl | 7.88.1-1 | — |
| Azure Linux 2 (CBL-Mariner) | mysql | 8.0.33-1 | — |
| Azure Linux 2 (CBL-Mariner) | rust | 1.72.0-2 | — |
Advisories 15
- RHSA-2023:3354 Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.51 SP2 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-2023-1350 Splunk Splunk Enterprise: Mehrere Schwachstellen in Komponenten von Drittanbietern BSI CERT-Bund (WID) · Jul 1, 2026
- WID-SEC-2023-2917 Xerox FreeFlow Print Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 30, 2026
- USN-5891-1 curl vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- SUSE-SU-2023:0429-1 Security update for curl SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2023-2229 Splunk Splunk Enterprise: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 18, 2025
- WID-SEC-2023-0405 cURL: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 6, 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
- openSUSE-SU-2024:12735-1 curl-7.88.1-1.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
- WID-SEC-2023-1614 Tenable Security Nessus Network Monitor: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 25, 2023
- WID-SEC-2023-2101 genua genucenter: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 20, 2023
- ALAS2-2023-1986 Moderate: curl security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Mar 7, 2023
- ALAS2023-2023-114 Moderate: curl security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Feb 22, 2023