In the eap-mschapv2 plugin (client-side) in strongSwan before 6.0.3, a malicious EAP-MSCHAPv2 server can send a crafted message of size 6 through 8, and cause an integer underflow that potentially results in a heap-based buffer overflow.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade strongswan | Jan 19, 2026 | Jan 16, 2026 |
| Debian | — | Upgrade strongswan | Oct 29, 2025 | Oct 29, 2025 |
| Freebsd | — | Upgrade strongswan | Dec 10, 2025 | Oct 27, 2025 |
| Suse | — | Upgrade strongswan-libs0Upgrade strongswan-nmUpgrade strongswan-sqliteUpgrade strongswan-ipsecUpgrade strongswan-hmacUpgrade strongswanUpgrade strongswan-mysqlUpgrade strongswan-doc | Dec 5, 2025 | Oct 28, 2025 |
| Ubuntu | — | Upgrade strongswanUpgrade libstrongswan | Oct 28, 2025 | Oct 27, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | Jan 16, 2026 |
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