Description
An issue was discovered in Fort before 1.6.3. A malicious RPKI repository that descends from a (trusted) Trust Anchor can serve (via rsync or RRDP) a resource certificate containing a bit string that doesn't properly decode into a Subject Public Key. OpenSSL does not report this problem during parsing, and when compiled with OpenSSL libcrypto versions below 3, Fort recklessly dereferences the pointer. Because Fort is an RPKI Relying Party, a crash can lead to Route Origin Validation unavailability, which can lead to compromised routing.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | fort-validator | 1.6.3-1 | — |
| Debian 13 | fort-validator | 1.6.3-1 | — |
| Debian 12 | fort-validator | 1.5.4-1+deb12u1 | — |
| Debian 11 | fort-validator | 1.5.3-1~deb11u2 | DLA-4066-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | fort-validator | 1.5.3-1ubuntu0.1 | USN-7813-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 24.04 LTS | fort-validator | 1.6.1-1ubuntu0.1~esm2 | USN-7813-1 |
| Ubuntu Pro 20.04 LTS | fort-validator | 1.2.0-1ubuntu0.1~esm1 | USN-7813-1 |
Advisories 2
- USN-7813-1 fort-validator vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DLA-4066-1 fort-validator - security update Debian Security (DSA / DLA) · Mar 9, 2026