Packages
- curl - HTTP, HTTPS, and FTP client and client libraries
Details
It was discovered that curl incorrectly reused non-TLS connections when
TLS was required in some STARTTLS configurations. A remote attacker could
possibly use this issue to obtain sensitive information. (CVE-2026-4873)
It was discovered that curl incorrectly reused certain HTTP Negotiate
connections. A remote attacker could possibly use this issue to obtain
sensitive information. (CVE-2026-5545)
It was discovered that curl incorrectly reused certain SMB connections. A
remote attacker could possibly use this issue to obtain sensitive
information. (CVE-2026-5773)
It was discovered that curl could leak proxy credentials when handling
redirects in some configurations. A remote attacker could possibly use
this issue to obtain sensitive information. (CVE-2026-6253)
It was...
It was discovered that curl incorrectly reused non-TLS connections when
TLS was required in some STARTTLS configurations. A remote attacker could
possibly use this issue to obtain sensitive information. (CVE-2026-4873)
It was discovered that curl incorrectly reused certain HTTP Negotiate
connections. A remote attacker could possibly use this issue to obtain
sensitive information. (CVE-2026-5545)
It was discovered that curl incorrectly reused certain SMB connections. A
remote attacker could possibly use this issue to obtain sensitive
information. (CVE-2026-5773)
It was discovered that curl could leak proxy credentials when handling
redirects in some configurations. A remote attacker could possibly use
this issue to obtain sensitive information. (CVE-2026-6253)
It was discovered that curl could leak cookies because of stale custom
cookie host handling in some requests. A remote attacker could possibly
use this issue to obtain sensitive information. (CVE-2026-6276)
It was discovered that curl could leak .netrc credentials when reusing
proxy connections in some situations. A remote attacker could possibly use
this issue to obtain sensitive information. (CVE-2026-6429)
It was discovered that curl could leak Digest authentication state when
switching proxies in some situations. A remote attacker could possibly use
this issue to obtain sensitive information. (CVE-2026-7168)
Update instructions
In general, a standard system update will make all the necessary changes.
Learn more about how to get the fixes.The problem can be corrected by updating your system to the following package versions:
| Ubuntu Release | Package Version | ||
|---|---|---|---|
| 26.04 LTS resolute | curl – 8.18.0-1ubuntu2.1 | ||
| libcurl3t64-gnutls – 8.18.0-1ubuntu2.1 | |||
| libcurl4t64 – 8.18.0-1ubuntu2.1 | |||
| 25.10 questing | curl – 8.14.1-2ubuntu1.3 | ||
| libcurl3t64-gnutls – 8.14.1-2ubuntu1.3 | |||
| libcurl4t64 – 8.14.1-2ubuntu1.3 | |||
| 24.04 LTS noble | curl – 8.5.0-2ubuntu10.9 | ||
| libcurl3t64-gnutls – 8.5.0-2ubuntu10.9 | |||
| libcurl4t64 – 8.5.0-2ubuntu10.9 | |||
| 22.04 LTS jammy | curl – 7.81.0-1ubuntu1.24 | ||
| libcurl3-gnutls – 7.81.0-1ubuntu1.24 | |||
| libcurl3-nss – 7.81.0-1ubuntu1.24 | |||
| libcurl4 – 7.81.0-1ubuntu1.24 | |||
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