UBUNTU-CVE-2026-9545
- Source
- https://ubuntu.com/security/CVE-2026-9545
- Import Source
- https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-9545.json
- JSON Data
- https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-9545
- Upstream
- Downstream
- Related
- Published
- 2026-06-24T14:00:00Z
- Modified
- 2026-07-02T22:49:56.163645346Z
- Severity
-
- Ubuntu - low
- Summary
- [none]
- Details
-
In this scenario, libcurl first uses a proper HTTP/3 server for the initial transfers, and when it makes a second transfer to the same site it has been replaced by the attacker's impostor machine - without a valid certificate. When libcurl returns to the hostname the second time with a cached SSL session (
CURLOPT_SSL_SESSIONID_CACHEis not disabled) and early data enabled (theCURLSSLOPT_EARLYDATAbit is set inCURLOPT_SSL_OPTIONS), libcurl might send off the second request's bytes on that new connection before enforcing the certificate verification failure. Potentially leaking sensitive information. - References
Affected packages
Ubuntu:25.10 / curl
Package
- Name
- curl
- Purl
- pkg:deb/ubuntu/curl?arch=source&distro=questing
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affectedFixed8.14.1-2ubuntu1.4
Affected versions
8.*
8.12.1-3ubuntu1
8.13.0-5ubuntu1
8.14.1-1ubuntu2
8.14.1-1ubuntu3
8.14.1-2ubuntu1
8.14.1-2ubuntu1.1
8.14.1-2ubuntu1.2
8.14.1-2ubuntu1.3
Ecosystem specific
{
"binaries": [
{
"binary_name": "curl",
"binary_version": "8.14.1-2ubuntu1.4"
},
{
"binary_name": "libcurl3t64-gnutls",
"binary_version": "8.14.1-2ubuntu1.4"
},
{
"binary_name": "libcurl4t64",
"binary_version": "8.14.1-2ubuntu1.4"
}
],
"priority_reason": "Upstream defined this as low severity",
"availability": "No subscription required"
}
Ubuntu:26.04:LTS / curl
Package
- Name
- curl
- Purl
- pkg:deb/ubuntu/curl?arch=source&distro=resolute
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affectedFixed8.18.0-1ubuntu2.2
Affected versions
8.*
8.14.1-2ubuntu1
8.17.0-1ubuntu1
8.18.0-1ubuntu1
8.18.0-1ubuntu2
8.18.0-1ubuntu2.1
Ecosystem specific
{
"binaries": [
{
"binary_name": "curl",
"binary_version": "8.18.0-1ubuntu2.2"
},
{
"binary_name": "libcurl3t64-gnutls",
"binary_version": "8.18.0-1ubuntu2.2"
},
{
"binary_name": "libcurl4t64",
"binary_version": "8.18.0-1ubuntu2.2"
}
],
"priority_reason": "Upstream defined this as low severity",
"availability": "No subscription required"
}