Description
When sending data to an MQTT server, libcurl <= 7.73.0 and 7.78.0 could in some circumstances erroneously keep a pointer to an already freed memory area and both use that again in a subsequent call to send data and also free it *again*.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | https://github.com/curl/curl | curl 7.73.0 to and including 7.78.0 | — |
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 | 7.79.1-1 | — |
| Debian 13 | curl | 7.79.1-1 | — |
| Debian 12 | curl | 7.79.1-1 | — |
| Debian 11 | curl | 7.74.0-1.3+deb11u2 | DSA-5197-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | curl | 7.74.0-1.3ubuntu2 | — |
| Ubuntu 20.04 LTS | curl | 7.68.0-1ubuntu2.7 | USN-5079-1 |
| Ubuntu 18.04 LTS | curl | 7.58.0-2ubuntu3.15 | USN-5079-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | curl | 7.79.1-1.1 | openSUSE-SU-2024:10582-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | curl | 7.79.0-r0 | — |
| Alpine v3.23 | curl | 7.79.0-r0 | — |
| Alpine v3.22 | curl | 7.79.0-r0 | — |
| Alpine v3.21 | curl | 7.79.0-r0 | — |
| Alpine v3.20 | curl | 7.79.0-r0 | — |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | curl | 7.79.0-r0 | — |
| Alpine v3.18 | curl | 7.79.0-r0 | — |
| Alpine v3.17 | curl | 7.79.0-r0 | — |
| Alpine v3.16 | curl | 7.79.0-r0 | — |
| Alpine v3.15 | curl | 7.79.0-r0 | — |
| Alpine v3.14 | curl | 7.79.0-r0 | — |
| Alpine v3.13 | curl | 7.79.0-r0 | — |
| Alpine v3.12 | curl | 7.79.0-r0 | — |
| Alpine v3.11 | curl | 7.79.0-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | curl +2 | 7.79.1-1.amzn2.0.1 | ALAS2-2021-1724 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | curl | 7.82.0-1 | — |
Advisories 12
- 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
- USN-5079-1 curl vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DSA-5197-1 curl - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:10582-1 curl-7.79.1-1.1 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
- WID-SEC-2022-0875 cURL: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 6, 2025
- ICSA-23-348-10 Siemens SIMATIC S7-1500 CISA ICS & IT advisories · Aug 12, 2025
- ICSA-22-069-09 Siemens SINEC INS CISA ICS & IT advisories · May 6, 2025
- WID-SEC-2022-1056 Apple macOS: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 21, 2023
- SSA-389290 SSA-389290: Third-Party Component Vulnerabilities in SINEC INS Siemens ProductCERT · Mar 8, 2022
- ALAS2-2021-1724 Moderate: curl security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Dec 9, 2021
References
- https://hackerone.com/reports/1269242
- FEDORA-2021-fc96a3a749 vendor-advisory
- https://www.oracle.com/security-alerts/cpuoct2021.html
- https://security.netapp.com/advisory/ntap-20211029-0003/
- FEDORA-2021-1d24845e93 vendor-advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf
- https://support.apple.com/kb/HT213183
- 20220314 APPLE-SA-2022-03-14-4 macOS Monterey 12.3 mailing-list
- DSA-5197 vendor-advisory
- GLSA-202212-01 vendor-advisory