CVE-2026-0613Public exploitNetwork attack vector

Authenticated internal service discovery via alternate-address SSRF

Published Jan 16, 2026 · Updated Jan 16, 2026

SSRF in the web_fetch tool in Librarian, Inc. The Librarian 1.0 and earlier allows remote authenticated users to scan internal services. The tool blocks obvious private destinations but passes alternate numeric IPv4 forms to Python's resolver, which converts them to internal addresses before issuing GET requests. An authenticated account can distinguish reachable ports from connection results, exposing internal service and cloud-instance metadata without changing data or interrupting service.

CVSS severity7.5
High
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in the web_fetch tool in Librarian, Inc. The Librarian 1.0 and earlier allows remote authenticated users to scan internal services. The tool blocks obvious private destinations but passes alternate numeric IPv4 forms to Python's resolver, which converts them to internal addresses before issuing GET requests. An authenticated account can distinguish reachable ports from connection results, exposing internal service and cloud-instance metadata without changing data or interrupting service.

The record

CVE
CVE-2026-0613
Published
Jan 16, 2026
Updated
Jan 16, 2026
Vendor
Librarian, Inc.
Product
The Librarian
Classifications
CWE-918, T1046
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 16, 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 <=1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Librarian, Inc. · The Librarianversion=0 <=1.0

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1046Network Service Discovery

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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