UBUNTU-CVE-2026-93601

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Source
https://ubuntu.com/security/CVE-2026-93601
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93601.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-93601
Upstream
Published
2026-09-21T00:00:00Z
Modified
2026-09-21T21:40:59Z
Severity
  • 2.2 (Low) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N CVSS Calculator
  • 2.1 (Low) CVSS_V4 - CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

rustls-webpki (the Rust webpki fork used by rustls) versions >= 0.101.0 and prior to 0.103.12 and 0.104.0-alpha.6 incorrectly accepted permitted-subtree DNS name constraints for certificates asserting a wildcard name. For example, a name constraint of accept.example.com was treated as satisfied by a certificate for *.example.com, which could feasibly assert reject.example.com — a name outside the permitted subtree. Because name constraints are restrictions applied to otherwise properly issued certificates, the issue is only reachable after signature verification succeeds and requires a misissued wildcard certificate to exploit.

References

Affected packages

Ubuntu:24.04:LTS / rust-rustls-webpki

Package

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

Affected ranges

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

Affected versions

0.*
0.101.4-4
0.101.7-2.1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "librust-rustls-webpki-dev",
            "binary_version":  "0.101.7-2.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93601.json"

Ubuntu:26.04:LTS / rust-rustls-webpki

Package

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

Affected ranges

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

Affected versions

0.*
0.102.8-5
0.103.7-1
0.103.7-1build1
0.103.9+ds-1
0.103.9+ds-2

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "librust-rustls-webpki-dev",
            "binary_version":  "0.103.9+ds-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93601.json"