UBUNTU-CVE-2026-42256

See a problem?
Please try reporting it to the source first.

Source

https://ubuntu.com/security/CVE-2026-42256

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42256.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-42256

Upstream

CVE-2026-42256

Published

2026-05-09T20:16:00Z

Modified

2026-06-16T13:30:53.001340829Z

Severity

6.0 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator
6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H CVSS Calculator
Ubuntu - medium

Summary

[none]

Details

Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. From versions 0.4.0 to before 0.4.24, 0.5.0 to before 0.5.14, and 0.6.0 to before 0.6.4, when authenticating a connection with SCRAM-SHA1 or SCRAM-SHA256, a hostile server can perform a computational denial-of-service attack on the client process by sending a big iteration count value. This issue has been patched in versions 0.4.24, 0.5.14, and 0.6.4.

References

Affected packages

Ubuntu:25.10 / jruby

Package

Name: jruby
Purl: pkg:deb/ubuntu/jruby?arch=source&distro=questing

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

9.*

9.4.8.0+ds-2ubuntu1

9.4.8.0+ds-3ubuntu1

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "9.4.8.0+ds-3ubuntu1",
            "binary_name": "jruby"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42256.json"

Ubuntu:25.10 / ruby3.3

Package

Name: ruby3.3
Purl: pkg:deb/ubuntu/ruby3.3?arch=source&distro=questing

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

3.*

3.3.7-1ubuntu2

3.3.8-2ubuntu1

3.3.8-2ubuntu2

3.3.8-2ubuntu2.1

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "3.3.8-2ubuntu2.1",
            "binary_name": "libruby3.3"
        },
        {
            "binary_version": "3.3.8-2ubuntu2.1",
            "binary_name": "ruby3.3"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42256.json"

Ubuntu:26.04:LTS / ruby3.3

Package

Name: ruby3.3
Purl: pkg:deb/ubuntu/ruby3.3?arch=source&distro=resolute

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

3.*

3.3.8-2ubuntu2

3.3.8-2ubuntu3

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "3.3.8-2ubuntu3",
            "binary_name": "libruby3.3"
        },
        {
            "binary_version": "3.3.8-2ubuntu3",
            "binary_name": "ruby3.3"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42256.json"