CVE-2026-16637Network attack vector

Unauthenticated SSRF and credential disclosure via redirects

Published Aug 7, 2026 · Updated Aug 7, 2026

SSRF in OPeNDAP Hyrax 1.18.0 allows remote attackers to reach blocked internal services through crafted gateway requests. The gateway validates only the initial URL against AllowedHosts, then follows HTTP 3xx redirects without rechecking the destination and forwards User-Id and Echo-Token headers. Unauthenticated requests can reach internal services; credential disclosure requires an authenticated user's request and exposes reusable legacy access.

CVSS severity6.5
Medium
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in OPeNDAP Hyrax 1.18.0 allows remote attackers to reach blocked internal services through crafted gateway requests. The gateway validates only the initial URL against AllowedHosts, then follows HTTP 3xx redirects without rechecking the destination and forwards User-Id and Echo-Token headers. Unauthenticated requests can reach internal services; credential disclosure requires an authenticated user's request and exposes reusable legacy access.

The record

CVE
CVE-2026-16637
Published
Aug 7, 2026
Updated
Aug 7, 2026
Vendor
OPeNDAP
Product
hyrax-docker
Classifications
CWE-918, CWE-201, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 7, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.18.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OPeNDAP · hyrax-dockerversion=1.18.0

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
CWE-201Insertion of Sensitive Information Into Sent Data
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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