# CVE-2026-35331: charon-cmd: Accepting Certificates Violating Name Constraints

CVE-2026-35331 is fixed in 15 products on 1 platform, first by charon-cmd 6.0.4-1ubuntu3, released April 22, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-35331
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: n/a
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 22, 2026

## Description

Accepting Certificates Violating Name Constraints

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | charon-cmd Ubuntu 22.04.1 LTS (jammy) | 5.9.5-2ubuntu2.6 | [charon-cmd 5.9.5-2ubuntu2.6](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-charon-cmd-5.9.5-2ubuntu2.6.md) | Apr 30, 2026 |
| Linux | charon-cmd Ubuntu 24.04.5 LTS (noble) | 5.9.13-2ubuntu4.24.04.3 | [charon-cmd 5.9.13-2ubuntu4.24.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-noble-charon-cmd-5.9.13-2ubuntu4.24.04.3.md) | Apr 30, 2026 |
| Linux | charon-cmd Ubuntu 25.10 (questing) | 6.0.1-6ubuntu4.3 | [charon-cmd 6.0.1-6ubuntu4.3](https://patchblox.com/security/data/fix/linux/ubuntu-questing-charon-cmd-6.0.1-6ubuntu4.3.md) | Apr 30, 2026 |
| Linux | charon-cmd Ubuntu 26.04.1 LTS (resolute) | 6.0.4-1ubuntu3 | [charon-cmd 6.0.4-1ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-charon-cmd-6.0.4-1ubuntu3.md) | Apr 22, 2026 |
| Linux | charon-systemd Ubuntu 22.04.1 LTS (jammy) | 5.9.5-2ubuntu2.6 | [charon-systemd 5.9.5-2ubuntu2.6](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-charon-systemd-5.9.5-2ubuntu2.6.md) | Apr 30, 2026 |
| Linux | charon-systemd Ubuntu 24.04.5 LTS (noble) | 5.9.13-2ubuntu4.24.04.3 | [charon-systemd 5.9.13-2ubuntu4.24.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-noble-charon-systemd-5.9.13-2ubuntu4.24.04.3.md) | Apr 30, 2026 |
| Linux | charon-systemd Ubuntu 25.10 (questing) | 6.0.1-6ubuntu4.3 | [charon-systemd 6.0.1-6ubuntu4.3](https://patchblox.com/security/data/fix/linux/ubuntu-questing-charon-systemd-6.0.1-6ubuntu4.3.md) | Apr 30, 2026 |
| Linux | charon-systemd Ubuntu 26.04.1 LTS (resolute) | 6.0.4-1ubuntu3 | [charon-systemd 6.0.4-1ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-charon-systemd-6.0.4-1ubuntu3.md) | Apr 22, 2026 |
| Linux | libcharon-extauth-plugins Ubuntu 22.04.1 LTS (jammy) | 5.9.5-2ubuntu2.6 | [libcharon-extauth-plugins 5.9.5-2ubuntu2.6](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libcharon-extauth-plugins-5.9.5-2ubuntu2.6.md) | Apr 30, 2026 |
| Linux | libcharon-extauth-plugins Ubuntu 24.04.5 LTS (noble) | 5.9.13-2ubuntu4.24.04.3 | [libcharon-extauth-plugins 5.9.13-2ubuntu4.24.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libcharon-extauth-plugins-5.9.13-2ubuntu4.24.04.3.md) | Apr 30, 2026 |
| Linux | libcharon-extauth-plugins Ubuntu 25.10 (questing) | 6.0.1-6ubuntu4.3 | [libcharon-extauth-plugins 6.0.1-6ubuntu4.3](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libcharon-extauth-plugins-6.0.1-6ubuntu4.3.md) | Apr 30, 2026 |
| Linux | libcharon-extauth-plugins Ubuntu 26.04.1 LTS (resolute) | 6.0.4-1ubuntu3 | [libcharon-extauth-plugins 6.0.4-1ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libcharon-extauth-plugins-6.0.4-1ubuntu3.md) | Apr 22, 2026 |
| Linux | libcharon-extra-plugins Ubuntu 22.04.1 LTS (jammy) | 5.9.5-2ubuntu2.6 | [libcharon-extra-plugins 5.9.5-2ubuntu2.6](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libcharon-extra-plugins-5.9.5-2ubuntu2.6.md) | Apr 30, 2026 |
| Linux | libcharon-extra-plugins Ubuntu 24.04.5 LTS (noble) | 5.9.13-2ubuntu4.24.04.3 | [libcharon-extra-plugins 5.9.13-2ubuntu4.24.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libcharon-extra-plugins-5.9.13-2ubuntu4.24.04.3.md) | Apr 30, 2026 |
| Linux | libcharon-extra-plugins Ubuntu 25.10 (questing) | 6.0.1-6ubuntu4.3 | [libcharon-extra-plugins 6.0.1-6ubuntu4.3](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libcharon-extra-plugins-6.0.1-6ubuntu4.3.md) | Apr 30, 2026 |
| Linux | libcharon-extra-plugins Ubuntu 26.04.1 LTS (resolute) | 6.0.4-1ubuntu3 | [libcharon-extra-plugins 6.0.4-1ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libcharon-extra-plugins-6.0.4-1ubuntu3.md) | Apr 22, 2026 |
| Linux | libstrongswan Ubuntu 22.04.1 LTS (jammy) | 5.9.5-2ubuntu2.6 | [libstrongswan 5.9.5-2ubuntu2.6](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libstrongswan-5.9.5-2ubuntu2.6.md) | Apr 30, 2026 |
| Linux | libstrongswan Ubuntu 24.04.5 LTS (noble) | 5.9.13-2ubuntu4.24.04.3 | [libstrongswan 5.9.13-2ubuntu4.24.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libstrongswan-5.9.13-2ubuntu4.24.04.3.md) | Apr 30, 2026 |
| Linux | libstrongswan Ubuntu 25.10 (questing) | 6.0.1-6ubuntu4.3 | [libstrongswan 6.0.1-6ubuntu4.3](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libstrongswan-6.0.1-6ubuntu4.3.md) | Apr 30, 2026 |
| Linux | libstrongswan Ubuntu 26.04.1 LTS (resolute) | 6.0.4-1ubuntu3 | [libstrongswan 6.0.4-1ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libstrongswan-6.0.4-1ubuntu3.md) | Apr 22, 2026 |
| Linux | libstrongswan-extra-plugins Ubuntu 22.04.1 LTS (jammy) | 5.9.5-2ubuntu2.6 | [libstrongswan-extra-plugins 5.9.5-2ubuntu2.6](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libstrongswan-extra-plugins-5.9.5-2ubuntu2.6.md) | Apr 30, 2026 |
| Linux | libstrongswan-extra-plugins Ubuntu 24.04.5 LTS (noble) | 5.9.13-2ubuntu4.24.04.3 | [libstrongswan-extra-plugins 5.9.13-2ubuntu4.24.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libstrongswan-extra-plugins-5.9.13-2ubuntu4.24.04.3.md) | Apr 30, 2026 |
| Linux | libstrongswan-extra-plugins Ubuntu 25.10 (questing) | 6.0.1-6ubuntu4.3 | [libstrongswan-extra-plugins 6.0.1-6ubuntu4.3](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libstrongswan-extra-plugins-6.0.1-6ubuntu4.3.md) | Apr 30, 2026 |
| Linux | libstrongswan-extra-plugins Ubuntu 26.04.1 LTS (resolute) | 6.0.4-1ubuntu3 | [libstrongswan-extra-plugins 6.0.4-1ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libstrongswan-extra-plugins-6.0.4-1ubuntu3.md) | Apr 22, 2026 |
| Linux | libstrongswan-standard-plugins Ubuntu 22.04.1 LTS (jammy) | 5.9.5-2ubuntu2.6 | [libstrongswan-standard-plugins 5.9.5-2ubuntu2.6](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libstrongswan-standard-plugins-5.9.5-2ubuntu2.6.md) | Apr 30, 2026 |
| Linux | libstrongswan-standard-plugins Ubuntu 24.04.5 LTS (noble) | 5.9.13-2ubuntu4.24.04.3 | [libstrongswan-standard-plugins 5.9.13-2ubuntu4.24.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libstrongswan-standard-plugins-5.9.13-2ubuntu4.24.04.3.md) | Apr 30, 2026 |
| Linux | libstrongswan-standard-plugins Ubuntu 25.10 (questing) | 6.0.1-6ubuntu4.3 | [libstrongswan-standard-plugins 6.0.1-6ubuntu4.3](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libstrongswan-standard-plugins-6.0.1-6ubuntu4.3.md) | Apr 30, 2026 |
| Linux | libstrongswan-standard-plugins Ubuntu 26.04.1 LTS (resolute) | 6.0.4-1ubuntu3 | [libstrongswan-standard-plugins 6.0.4-1ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libstrongswan-standard-plugins-6.0.4-1ubuntu3.md) | Apr 22, 2026 |
| Linux | strongswan Debian 12.15 (bookworm) | 5.9.8-5+deb12u4 | [DEBIAN-CVE-2026-35331](https://patchblox.com/security/data/fix/linux/debian-cve-2026-35331.md) | May 15, 2026 |
| Linux | strongswan Debian 13.5 (trixie) | 6.0.1-6+deb13u5 | [DEBIAN-CVE-2026-35331](https://patchblox.com/security/data/fix/linux/debian-cve-2026-35331.md) | May 15, 2026 |
| Linux | strongswan Debian 14 | 6.0.6-1 | [DEBIAN-CVE-2026-35331](https://patchblox.com/security/data/fix/linux/debian-cve-2026-35331.md) | May 15, 2026 |
| Linux | strongswan Ubuntu 22.04.1 LTS (jammy) | 5.9.5-2ubuntu2.6 | [strongswan 5.9.5-2ubuntu2.6](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-strongswan-5.9.5-2ubuntu2.6.md) | Apr 30, 2026 |
| Linux | strongswan Ubuntu 24.04.5 LTS (noble) | 5.9.13-2ubuntu4.24.04.3 | [strongswan 5.9.13-2ubuntu4.24.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-noble-strongswan-5.9.13-2ubuntu4.24.04.3.md) | Apr 30, 2026 |
| Linux | strongswan Ubuntu 25.10 (questing) | 6.0.1-6ubuntu4.3 | [strongswan 6.0.1-6ubuntu4.3](https://patchblox.com/security/data/fix/linux/ubuntu-questing-strongswan-6.0.1-6ubuntu4.3.md) | Apr 30, 2026 |
| Linux | strongswan Ubuntu 26.04.1 LTS (resolute) | 6.0.4-1ubuntu3 | [strongswan 6.0.4-1ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-strongswan-6.0.4-1ubuntu3.md) | Apr 22, 2026 |
| Linux | strongswan-charon Ubuntu 22.04.1 LTS (jammy) | 5.9.5-2ubuntu2.6 | [strongswan-charon 5.9.5-2ubuntu2.6](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-strongswan-charon-5.9.5-2ubuntu2.6.md) | Apr 30, 2026 |
| Linux | strongswan-charon Ubuntu 24.04.5 LTS (noble) | 5.9.13-2ubuntu4.24.04.3 | [strongswan-charon 5.9.13-2ubuntu4.24.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-noble-strongswan-charon-5.9.13-2ubuntu4.24.04.3.md) | Apr 30, 2026 |
| Linux | strongswan-charon Ubuntu 25.10 (questing) | 6.0.1-6ubuntu4.3 | [strongswan-charon 6.0.1-6ubuntu4.3](https://patchblox.com/security/data/fix/linux/ubuntu-questing-strongswan-charon-6.0.1-6ubuntu4.3.md) | Apr 30, 2026 |
| Linux | strongswan-charon Ubuntu 26.04.1 LTS (resolute) | 6.0.4-1ubuntu3 | [strongswan-charon 6.0.4-1ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-strongswan-charon-6.0.4-1ubuntu3.md) | Apr 22, 2026 |
| Linux | strongswan-libcharon Ubuntu 22.04.1 LTS (jammy) | 5.9.5-2ubuntu2.6 | [strongswan-libcharon 5.9.5-2ubuntu2.6](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-strongswan-libcharon-5.9.5-2ubuntu2.6.md) | Apr 30, 2026 |
| Linux | strongswan-libcharon Ubuntu 24.04.5 LTS (noble) | 5.9.13-2ubuntu4.24.04.3 | [strongswan-libcharon 5.9.13-2ubuntu4.24.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-noble-strongswan-libcharon-5.9.13-2ubuntu4.24.04.3.md) | Apr 30, 2026 |
| Linux | strongswan-libcharon Ubuntu 25.10 (questing) | 6.0.1-6ubuntu4.3 | [strongswan-libcharon 6.0.1-6ubuntu4.3](https://patchblox.com/security/data/fix/linux/ubuntu-questing-strongswan-libcharon-6.0.1-6ubuntu4.3.md) | Apr 30, 2026 |
| Linux | strongswan-libcharon Ubuntu 26.04.1 LTS (resolute) | 6.0.4-1ubuntu3 | [strongswan-libcharon 6.0.4-1ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-strongswan-libcharon-6.0.4-1ubuntu3.md) | Apr 22, 2026 |
| Linux | strongswan-nm Ubuntu 22.04.1 LTS (jammy) | 5.9.5-2ubuntu2.6 | [strongswan-nm 5.9.5-2ubuntu2.6](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-strongswan-nm-5.9.5-2ubuntu2.6.md) | Apr 30, 2026 |
| Linux | strongswan-nm Ubuntu 24.04.5 LTS (noble) | 5.9.13-2ubuntu4.24.04.3 | [strongswan-nm 5.9.13-2ubuntu4.24.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-noble-strongswan-nm-5.9.13-2ubuntu4.24.04.3.md) | Apr 30, 2026 |
| Linux | strongswan-nm Ubuntu 25.10 (questing) | 6.0.1-6ubuntu4.3 | [strongswan-nm 6.0.1-6ubuntu4.3](https://patchblox.com/security/data/fix/linux/ubuntu-questing-strongswan-nm-6.0.1-6ubuntu4.3.md) | Apr 30, 2026 |
| Linux | strongswan-nm Ubuntu 26.04.1 LTS (resolute) | 6.0.4-1ubuntu3 | [strongswan-nm 6.0.4-1ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-strongswan-nm-6.0.4-1ubuntu3.md) | Apr 22, 2026 |
| Linux | strongswan-pki Ubuntu 22.04.1 LTS (jammy) | 5.9.5-2ubuntu2.6 | [strongswan-pki 5.9.5-2ubuntu2.6](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-strongswan-pki-5.9.5-2ubuntu2.6.md) | Apr 30, 2026 |
| Linux | strongswan-pki Ubuntu 24.04.5 LTS (noble) | 5.9.13-2ubuntu4.24.04.3 | [strongswan-pki 5.9.13-2ubuntu4.24.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-noble-strongswan-pki-5.9.13-2ubuntu4.24.04.3.md) | Apr 30, 2026 |
| Linux | strongswan-pki Ubuntu 25.10 (questing) | 6.0.1-6ubuntu4.3 | [strongswan-pki 6.0.1-6ubuntu4.3](https://patchblox.com/security/data/fix/linux/ubuntu-questing-strongswan-pki-6.0.1-6ubuntu4.3.md) | Apr 30, 2026 |
| Linux | strongswan-pki Ubuntu 26.04.1 LTS (resolute) | 6.0.4-1ubuntu3 | [strongswan-pki 6.0.4-1ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-strongswan-pki-6.0.4-1ubuntu3.md) | Apr 22, 2026 |
| Linux | strongswan-scepclient Ubuntu 22.04.1 LTS (jammy) | 5.9.5-2ubuntu2.6 | [strongswan-scepclient 5.9.5-2ubuntu2.6](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-strongswan-scepclient-5.9.5-2ubuntu2.6.md) | Apr 30, 2026 |
| Linux | strongswan-starter Ubuntu 22.04.1 LTS (jammy) | 5.9.5-2ubuntu2.6 | [strongswan-starter 5.9.5-2ubuntu2.6](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-strongswan-starter-5.9.5-2ubuntu2.6.md) | Apr 30, 2026 |
| Linux | strongswan-starter Ubuntu 24.04.5 LTS (noble) | 5.9.13-2ubuntu4.24.04.3 | [strongswan-starter 5.9.13-2ubuntu4.24.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-noble-strongswan-starter-5.9.13-2ubuntu4.24.04.3.md) | Apr 30, 2026 |
| Linux | strongswan-starter Ubuntu 25.10 (questing) | 6.0.1-6ubuntu4.3 | [strongswan-starter 6.0.1-6ubuntu4.3](https://patchblox.com/security/data/fix/linux/ubuntu-questing-strongswan-starter-6.0.1-6ubuntu4.3.md) | Apr 30, 2026 |
| Linux | strongswan-starter Ubuntu 26.04.1 LTS (resolute) | 6.0.4-1ubuntu3 | [strongswan-starter 6.0.4-1ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-strongswan-starter-6.0.4-1ubuntu3.md) | Apr 22, 2026 |
| Linux | strongswan-swanctl Ubuntu 22.04.1 LTS (jammy) | 5.9.5-2ubuntu2.6 | [strongswan-swanctl 5.9.5-2ubuntu2.6](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-strongswan-swanctl-5.9.5-2ubuntu2.6.md) | Apr 30, 2026 |
| Linux | strongswan-swanctl Ubuntu 24.04.5 LTS (noble) | 5.9.13-2ubuntu4.24.04.3 | [strongswan-swanctl 5.9.13-2ubuntu4.24.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-noble-strongswan-swanctl-5.9.13-2ubuntu4.24.04.3.md) | Apr 30, 2026 |
| Linux | strongswan-swanctl Ubuntu 25.10 (questing) | 6.0.1-6ubuntu4.3 | [strongswan-swanctl 6.0.1-6ubuntu4.3](https://patchblox.com/security/data/fix/linux/ubuntu-questing-strongswan-swanctl-6.0.1-6ubuntu4.3.md) | Apr 30, 2026 |
| Linux | strongswan-swanctl Ubuntu 26.04.1 LTS (resolute) | 6.0.4-1ubuntu3 | [strongswan-swanctl 6.0.4-1ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-strongswan-swanctl-6.0.4-1ubuntu3.md) | Apr 22, 2026 |

---

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