High · CVSS 7.2CVE-2026-53499

FORT-validator Vulnerable to RRDP Shared Snapshot Cache PoisoningCVE-2026-53499

Answer in brief

CVE-2026-53499 records a High severity (CVSS 7.2) vulnerability in FORT-validator Vulnerable to RRDP Shared Snapshot Cache Poisoning. The current sources do not mark it as known exploited. The current feed maps NICMx/FORT-validator (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 21, 2026Updated Sep 9, 2026Source checked Oct 6, 2026First seen by HOL Aug 21, 2026Material review Sep 9, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.2
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 7.2. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps NICMx/FORT-validator (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
NICMx/FORT-validatorgeneric	<1.6.8	1.6.8

Recommended response

Check inventory. Check lockfiles and deployed manifests for NICMx/FORT-validator.
Review the reported fix. Update NICMx/FORT-validator to 1.6.8 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 21, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 9, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 21, 2026

Sources and claim methodology

GitHub security advisorygithub.com

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.