CVE-2026-0612Public exploitNetwork attack vector

Internal information disclosure via encoded IP bypass

Published Jan 16, 2026 · Updated Jan 16, 2026

Information leakage in The Librarian 1.0 and earlier allows remote attackers to read internal web content through web_fetch. The web_fetch destination check accepts alternate numeric IPv4 forms that Python resolves to loopback or private addresses, causing the hosted backend to fetch and return attacker-selected content. No privileges or user interaction are required; exposed data is limited to HTTP content reachable from the service, including internal services and instance metadata.

CVSS severity7.5
High
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information leakage in The Librarian 1.0 and earlier allows remote attackers to read internal web content through web_fetch. The web_fetch destination check accepts alternate numeric IPv4 forms that Python resolves to loopback or private addresses, causing the hosted backend to fetch and return attacker-selected content. No privileges or user interaction are required; exposed data is limited to HTTP content reachable from the service, including internal services and instance metadata.

The record

CVE
CVE-2026-0612
Published
Jan 16, 2026
Updated
Jan 16, 2026
Vendor
Librarian, Inc.
Product
The Librarian
Classifications
CWE-497, T1190
Attack vector
network
Privileges
unauthenticated

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 privilegesunauthenticated

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-497Exposure of Sensitive System Information to an Unauthorized Control Sphere
T1190Exploit Public-Facing Application

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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