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CVE-2026-17552

Status: DeferredCritical (9.1)—

Plack::App::Prerender versions before 0.3.0 for Perl can proxy to an arbitrary host via unvalidated REQUEST_URI concatenation in call.

When the rewrite base is a plain string, the REQUEST_URI is appended to it, with no check that the path starts with a forward slash ('/').

When the rewrite base does not contain a path (which is the standard given in the SYNOPSIS), an attacker can create a request that changes the hostname. A request target starting with an at-sign ('@') changes the base to a RFC 3986 userinfo component.

For example, a rewrite base of "https://example.com" with the submitted request "GET @192.168.1.2/" will send a request to "https://example.com@192.168.1.2/", with the rendered content returned to the attacker.

Read full descriptionShow less

This allows an attacker to access internal or restricted hosts that only the webserver has access to.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

🎯 ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

Vulnerabilidad SSRF en aplicación web expuesta (CWE-918, AV:N/PR:N): concatenación no validada de REQUEST_URI permite redirigir tráfico a hosts internos, actuando como proxy no autorizado hacia recursos restringidos.

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

🛡️ ATT&CK mitigations that cover these techniques

Vulnerability ScanningSSL/TLS InspectionPrivileged Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkFilter Network Traffic

Affected technologies (1)

⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.

Plack — APP PrerenderAI

CWEs

References

Raw JSON (NVD)

Show
{
  "id": "CVE-2026-17552",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-17552",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-07-28T13:46:46.867311Z"
        }
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    "cvssMetricV31": [
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        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 9.1,
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.2,
        "exploitabilityScore": 3.9
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  "affected": [
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      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "affectedData": [
        {
          "repo": "https://github.com/robrwo/perl-Plack-App-Prerender",
          "vendor": "RRWO",
          "product": "Plack::App::Prerender",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "lessThan": "0.3.0",
              "versionType": "custom"
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          ],
          "packageName": "Plack-App-Prerender",
          "programFiles": [
            "lib/Plack/App/Prerender.pm"
          ],
          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected",
          "programRoutines": [
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  ],
  "published": "2026-07-27T18:16:54.150",
  "references": [
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      "url": "https://github.com/robrwo/perl-Plack-App-Prerender/commit/2d793dd69e2b6f4e469618ee742bd8402677202d.patch",
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      "url": "https://metacpan.org/release/RRWO/Plack-App-Prerender-v0.3.0/changes",
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
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      "url": "http://www.openwall.com/lists/oss-security/2026/07/28/3",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  "vulnStatus": "Deferred",
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      "description": [
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Plack::App::Prerender versions before 0.3.0 for Perl can proxy to an arbitrary host via unvalidated REQUEST_URI concatenation in call.\n\nWhen the rewrite base is a plain string, the REQUEST_URI is appended to it, with no check that the path starts with a forward slash ('/').\n\nWhen the rewrite base does not contain a path (which is the standard given in the SYNOPSIS), an attacker can create a request that changes the hostname. A request target starting with an at-sign ('@') changes the base to a RFC 3986 userinfo component.\n\nFor example, a rewrite base of \"https://example.com\" with the submitted request \"GET @192.168.1.2/\" will send a request to \"https://example.com@192.168.1.2/\", with the rendered content returned to the attacker.\n\nThis allows an attacker to access internal or restricted hosts that only the webserver has access to."
    }
  ],
  "lastModified": "2026-07-28T16:19:30.463",
  "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
}