CVE-2026-53499

HIGHPre-NVD 7.27.2—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.2 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2% (8th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
7.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 7.2Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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.

CVSS v3
7.2
EG Score
7.2HIGHmedium confidence
EG Risk
32
EG Risk 32/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity72% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
8th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 21, 2026

Last Modified

September 9, 2026

Advisory Details (1)

Auto-updated Aug 21, 2026
🔬 Proof of concept available. Patch available. Sources: github.
githubMentions a patch (unverified)🟡 PoC Available

RRDP Shared Snapshot Cache Poisoning in FORT-validator · Advisory · NICMx/FORT-validator · GitHub

https://github.com/NICMx/FORT-validator/security/advisories/GHSA-qfm3-577x-rh54

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
fort-validator1.5.4-1 ... 1.7.0.experimental-1 (16 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
fort-validator1.6.6-1, 1.6.7-1, 1.6.7-1~bpo13+1
  • every version up to 1.6.8-0+deb13u1: fixed in 1.6.8-0+deb13u1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
fort-validator1.6.6-1, 1.6.7-1, 1.6.7-1~bpo13+1
  • every version up to 1.6.8-1: fixed in 1.6.8-1
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 12× in last 7d / 50× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-10-10 20:00 UTCEPSS rescore
  2. 2026-10-09 20:07 UTCEPSS rescore
  3. 2026-10-09 05:38 UTCEG score recompute
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  25. 2026-09-27 15:47 UTCEG score recompute
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  1. 2026-09-27 13:48 UTCEPSS rescore
  2. 2026-09-27 02:23 UTCEG score recompute
  3. 2026-09-26 15:59 UTCEPSS rescore
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  5. 2026-09-24 14:04 UTCEPSS rescore
  6. 2026-09-24 03:32 UTCEG score recompute
  7. 2026-09-23 17:54 UTCEPSS rescore
  8. 2026-09-23 02:31 UTCEG score recompute
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  11. 2026-09-20 20:16 UTCEPSS rescore
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  20. 2026-09-14 01:38 UTCEG score recompute
  21. 2026-09-13 16:47 UTCEPSS rescore
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  23. 2026-09-11 23:32 UTCEG score recompute
  24. 2026-09-11 14:53 UTCEPSS rescore
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  27. 2026-09-10 09:35 UTCEPSS rescore
  28. 2026-09-09 01:44 UTCEG score recompute
  29. 2026-09-08 22:01 UTCEPSS rescore
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  34. 2026-09-04 23:48 UTCEG score recompute
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  44. 2026-08-30 19:17 UTCEPSS rescore
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  48. 2026-08-28 21:41 UTCEPSS rescore
  49. 2026-08-27 22:40 UTCEG score recompute
  50. 2026-08-27 14:25 UTCEPSS rescore
  51. 2026-08-26 21:39 UTCEG score recompute
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  53. 2026-08-25 20:36 UTCEG score recompute
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  56. 2026-08-25 13:49 UTCEPSS rescore
  57. 2026-08-25 02:35 UTCEG score recompute
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  59. 2026-08-23 00:27 UTCEG score recompute
  60. 2026-08-23 00:19 UTCEPSS rescore
  61. 2026-08-21 23:25 UTCEG score recompute
  62. 2026-08-21 22:39 UTCEG score recompute
  63. 2026-08-21 22:39 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-53499?
CVE-2026-53499 is a high vulnerability published on August 21, 2026. 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…
When was CVE-2026-53499 disclosed?
CVE-2026-53499 was first published on August 21, 2026, with the most recent update on September 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-53499 actively exploited?
CVE-2026-53499 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (8th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-53499?
CVE-2026-53499 has a CVSS base score of 7.2 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-53499?
A fix for CVE-2026-53499 is available: update to the fixed version the vendor names in its advisory.

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