USN-8190-1

SeungMyung Lee discovered that Rack::Session did not properly reject cookies upon decryption failure. A remote attacker could use this issue to manipulate session contents and possibly gain unauthorized access.

References

Affected packages

Ubuntu:25.10 / ruby-rack-session

Package

Name: ruby-rack-session
Purl: pkg:deb/ubuntu/ruby-rack-session@2.1.1-0.1ubuntu0.1?arch=source&distro=questing

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

2.1.1-0.1ubuntu0.1

Affected versions

2.*

2.1.1-0.1

Ecosystem specific

{
    "availability":  "No subscription required",
    "binaries":  [
        {
            "binary_name":  "ruby-rack-session",
            "binary_version":  "2.1.1-0.1ubuntu0.1"
        }
    ]
}

Database specific

cves_map

{
    "cves":  [
        {
            "id":  "CVE-2026-39324",
            "severity":  [
                {
                    "score":  "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
                    "type":  "CVSS_V4"
                },
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem":  "Ubuntu:25.10"
}

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8190-1.json"