CVE-2026-17552Public exploitNetwork attack vector

Unauthenticated SSRF via unvalidated request-target concatenation

Published Jul 27, 2026 · Updated Jul 27, 2026

SSRF in Robert Rothenberg's Plack::App::Prerender before 0.3.0 allows remote attackers to read arbitrary-host responses via crafted request targets. The call routine appends REQUEST_URI directly to a string rewrite base without requiring a leading slash, so an @-prefixed target converts the base host into URI userinfo. An unauthenticated raw request can therefore reach internal hosts visible to the server and return their rendered content, but cannot change the configured scheme.

CVSS severity9.1
Critical
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in Robert Rothenberg's Plack::App::Prerender before 0.3.0 allows remote attackers to read arbitrary-host responses via crafted request targets. The call routine appends REQUEST_URI directly to a string rewrite base without requiring a leading slash, so an @-prefixed target converts the base host into URI userinfo. An unauthenticated raw request can therefore reach internal hosts visible to the server and return their rendered content, but cannot change the configured scheme.

The record

CVE
CVE-2026-17552
Published
Jul 27, 2026
Updated
Jul 27, 2026
Vendor
Robert Rothenberg
Product
Plack::App::Prerender
Classifications
CWE-918, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 27, 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=0 <0.3.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Robert Rothenberg · Plack::App::Prerenderversion=0 <0.3.0

Published CVSS scores

9.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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 exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1190Exploit Public-Facing Application

Public exploit references

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Technologies

Your stack

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Your stack

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