Description
A use after free vulnerability exists in curl <7.87.0. Curl can be asked to *tunnel* virtually all protocols it supports through an HTTP proxy. HTTP proxies can (and often do) deny such tunnel operations. When getting denied to tunnel the specific protocols SMB or TELNET, curl would use a heap-allocated struct after it had been freed, in its transfer shutdown code path.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | https://github.com/curl/curl | Fixed in curl 7.87.0 | — |
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 | 7.86.0-3 | — |
| Debian 13 | curl | 7.86.0-3 | — |
| Debian 12 | curl | 7.86.0-3 | — |
| Debian 11 | curl | 7.74.0-1.3+deb11u5 | DSA-5330-1 |
| Debian 10 | curl | 7.64.0-4+deb10u4 | DLA-3288-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | curl | 7.81.0-1ubuntu1.7 | USN-5788-1 |
| Ubuntu 20.04 LTS | curl | 7.68.0-1ubuntu2.15 | USN-5788-1 |
| Ubuntu 18.04 LTS | curl | 7.58.0-2ubuntu3.22 | USN-5788-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 16.04 LTS | curl | 7.47.0-1ubuntu2.19+esm7 | USN-5894-1 |
| Ubuntu Pro 14.04 LTS | curl | 7.35.0-1ubuntu2.20+esm14 | USN-5894-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | curl +4 | 7.76.1-23.el9 | RHSA-2023:2478 |
| RHEL 8 | curl +3 | 7.61.1-30.el8 | RHSA-2023:2963 |
| RHEL 7 | curl +2 | 7.29.0-59.el7_9.2 | RHSA-2023:7743 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8.6 EUS | curl +3 | 7.61.1-22.el8_6.12 | RHSA-2024:0428 |
| 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 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | curl +4 | 7.76.1-23.el9 | ALSA-2023:2478 |
| AlmaLinux 8 | curl +3 | 7.61.1-30.el8 | ALSA-2023:2963 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP4 | curl | 7.79.1-150400.5.12.1 | SUSE-SU-2022:4597-1 |
| SLES 15 SP1 | curl | 7.60.0-150000.51.1 | SUSE-SU-2023:2226-1 |
| SLES 12 SP5 | curl | 7.60.0-11.52.1 | SUSE-SU-2022:4598-1 |
| 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 | 7.60.0-11.52.1 | SUSE-SU-2022:4598-1 |
| SLES for SAP 12 SP4 | curl | 7.60.0-4.56.1 | SUSE-SU-2023:2228-1 |
| SLE Real Time 15 SP3 | curl | 7.66.0-150200.4.45.1 | SUSE-SU-2022:4633-1 |
| SLE Micro 5.3 | curl | 7.79.1-150400.5.12.1 | SUSE-SU-2022:4597-1 |
| SLE Micro 5.2 | curl | 7.66.0-150200.4.45.1 | SUSE-SU-2022:4633-1 |
| SLE Micro 5.1 | curl | 7.66.0-150200.4.45.1 | SUSE-SU-2022:4633-1 |
| 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 | 7.87.0-1.1 | openSUSE-SU-2024:12583-1 |
| openSUSE Leap 15.4 | curl | 7.79.1-150400.5.12.1 | SUSE-SU-2022:4597-1 |
| openSUSE Leap 15.3 | curl | 7.66.0-150200.4.45.1 | SUSE-SU-2022:4633-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap Micro 5.3 | curl | 7.79.1-150400.5.12.1 | SUSE-SU-2022:4597-1 |
| openSUSE Leap Micro 5.2 | curl | 7.66.0-150200.4.45.1 | SUSE-SU-2022:4633-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | curl | 7.87.0-r0 | — |
| Alpine v3.23 | curl | 7.87.0-r0 | — |
| Alpine v3.22 | curl | 7.87.0-r0 | — |
| Alpine v3.21 | curl | 7.87.0-r0 | — |
| Alpine v3.20 | curl | 7.87.0-r0 | — |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | curl | 7.87.0-r0 | — |
| Alpine v3.18 | curl | 7.87.0-r0 | — |
| Alpine v3.17 | curl | 7.87.0-r0 | — |
| Alpine v3.16 | curl | 7.83.1-r5 | — |
| Alpine v3.15 | curl | 7.80.0-r5 | — |
| Alpine v3.14 | curl | 7.79.1-r4 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | curl +4 | 7.87.0-2.amzn2023.0.2 | ALAS2023-2023-083 |
| Amazon Linux 2 | curl +2 | 7.87.0-2.amzn2.0.1 | ALAS2-2023-1924 |
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 | 7.86.0-3 | — |
| Azure Linux 2 (CBL-Mariner) | mysql | 8.0.33-1 | — |
| Azure Linux 2 (CBL-Mariner) | rust | 1.72.0-2 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | curl +4 | 7.76.1-23.el9 | ELSA-2023-2478 |
| Oracle Linux 8 | curl +3 | 7.61.1-30.el8 | ELSA-2023-2963 |
| Oracle Linux 7 | curl +2 | 7.29.0-59.0.3.el7_9.2 | ELSA-2023-7743 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | curl | 7.87.0-r0 | — |
Advisories 35
- ALSA-2023:2478 Low: curl security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2023:2963 Low: curl security and bug fix update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2024:0428 Red Hat Security Advisory: curl security and bug fix update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2023:7743 Red Hat Security Advisory: curl security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- 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
- RHSA-2023:2963 Red Hat Security Advisory: curl security and bug fix update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2023:2478 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-2023-2031 Xerox FreeFlow Print Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 11, 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-5894-1 curl vulnerabilities Ubuntu Security Notices (USN) · Jun 29, 2026
- USN-5788-1 curl vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-5330-1 curl - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3288-1 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
- openSUSE-SU-2024:12583-1 curl-7.87.0-1.1 on GA media 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-2022:4598-1 Security update for curl SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:4597-1 Security update for curl 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-2022-2375 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
- ICSA-23-131-05 Siemens SINEC NMS Third-Party CISA ICS & IT advisories · May 6, 2025
- SUSE-SU-2022:4633-1 Security update for curl SUSE / openSUSE Security Updates · May 2, 2025
- WID-SEC-2023-0777 Apple macOS: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jul 18, 2024
- ALAS2023-2023-083 Moderate: curl security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Feb 15, 2024
- ELSA-2023-7743 Low: curl security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Dec 12, 2023
- WID-SEC-2023-1614 Tenable Security Nessus Network Monitor: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 25, 2023
- ELSA-2023-2963 Low: curl security and bug fix update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · May 24, 2023
- ELSA-2023-2478 Low: curl security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · May 15, 2023
- SSA-892048 SSA-892048: Third-Party Component Vulnerabilities in SINEC NMS before V1.0.3.1 Siemens ProductCERT · May 9, 2023
- ALAS2-2023-1924 Moderate: curl security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Feb 4, 2023