UBUNTU-CVE-2026-55599

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

Source

https://ubuntu.com/security/CVE-2026-55599

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55599.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-55599

Upstream

CVE-2026-55599

Published

2026-06-22T21:16:00Z

Modified

2026-06-24T09:03:12Z

Severity

5.8 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N CVSS Calculator
Ubuntu - medium

Summary

[none]

Details

phpseclib is a PHP secure communications library. From 0.1.1 until 1.0.30, 2.0.55, and 3.0.54, when an application validates an untrusted X.509 certificate with phpseclib, X509::validateSignature() reads a URL out of that certificate's Authority Information Access (AIA) extension and connects to it. Attacker who supplies certificate fully controls host, port, and path of that connection. URL fetching is enabled by default, and no destination is blocked. An unauthenticated attacker can therefore make a validating server open connections to internal hosts and ports it should never reach, for example loopback 127.0.0.1, cloud metadata address 169.254.169.254, and internal-only services. This is a server-side request forgery (SSRF) caused by an insecure default. This vulnerability is fixed in 1.0.30, 2.0.55, and 3.0.54.

References

Affected packages

Ubuntu:24.04:LTS

phpseclib

Package

Name: phpseclib
Purl: pkg:deb/ubuntu/phpseclib?arch=source&distro=noble

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.0.21-2

1.0.22-1

1.0.23-1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "php-seclib",
            "binary_version": "1.0.23-1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55599.json"

Ubuntu:25.10

phpseclib

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.0.23-6

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "php-seclib",
            "binary_version": "1.0.23-6"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55599.json"

Ubuntu:26.04:LTS

phpseclib

Package

Name: phpseclib
Purl: pkg:deb/ubuntu/phpseclib?arch=source&distro=resolute

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.0.23-6

1.0.24-1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "php-seclib",
            "binary_version": "1.0.24-1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55599.json"

Ubuntu:Pro:16.04:LTS

phpseclib

Package

Name: phpseclib
Purl: pkg:deb/ubuntu/phpseclib?arch=source&distro=esm-apps%2Fxenial

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

0.*

0.3.10-3

1.*

1.0.0-2

1.0.0-3

1.0.1-1

1.0.1-3

1.0.1-3ubuntu0.1

1.0.1-3ubuntu0.1+esm1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "php-seclib",
            "binary_version": "1.0.1-3ubuntu0.1+esm1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55599.json"

Ubuntu:Pro:18.04:LTS

phpseclib

Package

Name: phpseclib
Purl: pkg:deb/ubuntu/phpseclib?arch=source&distro=esm-apps%2Fbionic

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.0.7-1

1.0.8-1

1.0.9-1

1.0.9-1ubuntu0.1~esm1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "php-seclib",
            "binary_version": "1.0.9-1ubuntu0.1~esm1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55599.json"

Ubuntu:Pro:20.04:LTS

phpseclib

Package

Name: phpseclib
Purl: pkg:deb/ubuntu/phpseclib?arch=source&distro=esm-apps%2Ffocal

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.0.16-2

1.0.18-2

1.0.18-2ubuntu0.1~esm1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "php-seclib",
            "binary_version": "1.0.18-2ubuntu0.1~esm1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55599.json"

Ubuntu:Pro:22.04:LTS

phpseclib

Package

Name: phpseclib
Purl: pkg:deb/ubuntu/phpseclib?arch=source&distro=esm-apps%2Fjammy

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.0.19-3ubuntu2

1.0.19-3ubuntu3

1.0.20-1

1.0.20-1ubuntu0.1~esm1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "php-seclib",
            "binary_version": "1.0.20-1ubuntu0.1~esm1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55599.json"