UBUNTU-CVE-2026-123609

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Source
https://ubuntu.com/security/CVE-2026-123609
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-123609.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-123609
Upstream
Published
2026-11-09T00:00:00Z
Modified
2026-11-10T02:50:22Z
Severity
  • 4.0 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:H/I:N/A:N CVSS Calculator
  • 4.1 (Medium) CVSS_V4 - CVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Rustls before 0.23.46 and 0.24.0-dev.1 before 0.24.0-dev.2 contains an information disclosure vulnerability where derived Debug formatting of client session values exposes secret key material. Custom ClientSessionStore implementations that log Tls12ClientSessionValue or Tls13ClientSessionValue can leak TLS 1.2 master secrets or TLS 1.3 resumption PSKs to log readers.

References

Affected packages

Ubuntu:24.04:LTS / rust-rustls

Package

Name
rust-rustls
Purl
pkg:deb/ubuntu/rust-rustls?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.21.6-3
0.21.7-1
0.21.9-1
0.21.10-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "librust-rustls-dev",
            "binary_version": "0.21.10-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-123609.json"

Ubuntu:26.10 / rust-rustls

Package

Name
rust-rustls
Purl
pkg:deb/ubuntu/rust-rustls?arch=source&distro=stonking

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.23.36+ds-1
0.23.41+ds-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "librust-rustls-dev",
            "binary_version": "0.23.41+ds-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-123609.json"

Ubuntu:26.04:LTS / rust-rustls

Package

Name
rust-rustls
Purl
pkg:deb/ubuntu/rust-rustls?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.23.26+ds-1
0.23.33+ds-3build2
0.23.35+ds-1
0.23.35+ds-1build1
0.23.36+ds-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "librust-rustls-dev",
            "binary_version": "0.23.36+ds-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-123609.json"