CVE-2026-53499 FORT-validator Vulnerable to RRDP Shared Snapshot Cache Poisoning
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-53499?
CVE-2026-53499 is a high-severity vulnerability in NICMx FORT-validator, published on 21 Aug 2026.
Official description
FORT Validator is a Resource Public Key Infrastructure (RPKI) relying-party validator that produces validated route-origin data. FORT Validator versions through 1.6.7 contain an origin-validation error in their RRDP processing: a delegated CA under the same Trust Anchor Locator (TAL) can reference a victim CA’s public RRDP notification and snapshot URLs, causing FORT’s URL-based download cache to report success after deleting the victim’s local snapshot. Following a routine victim publication, this can silently remove the victim’s VRPs and other signed objects from FORT’s output, potentially enabling route hijacking or loss of reachability. Version 1.6.8 contains a patch that rejects cross-origin RRDP snapshot and delta URLs; as a workaround, administrators can disable HTTP/RRDP with --http.enabled=false while keeping rsync enabled, although this can leave data unavailable or stale where rsync is not supported.
Weakness: CWE-346
Which versions are affected by CVE-2026-53499?
How do I fix CVE-2026-53499?
Upgrade to a fixed version.
Is CVE-2026-53499 being exploited?
There is no known exploitation of CVE-2026-53499 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-53499, GHSA-qfm3-577x-rh54, UBUNTU-CVE-2026-53499.