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CVE-2026-53499— FORT-validator Vulnerable to RRDP Shared Snapshot Cache Poisoning

Quick assessment

Affected
NICMx FORT-validator
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FORT Validator 是一个资源公钥基础设施（RPKI）依赖方验证器，用于生成经过验证的路由起源数据。FORT Validator 1.6.7 及更早版本在处理 RRDP（RPKI-Repository Delta and Delta Protocol）时存在起源验证错误：在相同信任锚定位器（TAL）下，一个被委托的证书颁发机构（CA）可以引用受害者 CA 的公共 RRDP 通知和快照（snapshot）URL 地址，导致 FORT 的基于 URL 的下载缓存会在删除受害者本地快照后仍报告下载成功。在受害者

CVSS 7.2 · High EPSS 0.16% · P5

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
NICMx FORT-validator < 1.6.8 affected
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I. Basic Information for CVE-2026-53499

Vulnerability Information
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Vulnerability Title
FORT-validator Vulnerable to RRDP Shared Snapshot Cache Poisoning
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:H/SA:H
Source: CVE Program / CVE List V5
Vulnerability Type
源验证错误
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
NICMx FORT-validator < 1.6.8 -

II. Public POCs for CVE-2026-53499

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 7189 chars
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III. Intelligence Information for CVE-2026-53499

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Vendor Advisories for CVE-2026-53499 (1)

IV. Related Vulnerabilities

Same product: FORT-validator
Same vendor: NICMx
Same weakness: CWE-346

V. Comments for CVE-2026-53499

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