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 Key Usage extension composed of more than two bytes of data. Fort writes this string into a 2-byte buffer without properly sanitizing its length, leading to a buffer overflow.
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