CVE-2025-9960Public exploitNetwork attack vector

SSRF via unnormalized IPv6-mapped loopback addresses

Published Sep 22, 2025 · Updated Sep 22, 2025

SSRF in is-localhost-ip 2.0.0 allows remote attackers to reach loopback services through IPv6-mapped IPv4 addresses. The isLocalhost function compares text against incomplete address patterns and returns false for the valid loopback form ::ffff:7f00:1 when canBind is false. Exploitation requires a consuming application to trust a false result before fetching attacker-controlled URLs, exposing otherwise unreachable local services or data.

CVSS severity6.9
Medium
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

SSRF in is-localhost-ip 2.0.0 allows remote attackers to reach loopback services through IPv6-mapped IPv4 addresses. The isLocalhost function compares text against incomplete address patterns and returns false for the valid loopback form ::ffff:7f00:1 when canBind is false. Exploitation requires a consuming application to trust a false result before fetching attacker-controlled URLs, exposing otherwise unreachable local services or data.

The record

CVE
CVE-2025-9960
Published
Sep 22, 2025
Updated
Sep 22, 2025
Vendor
Konstantin Vyatkin
Product
is-localhost-ip
Classifications
CWE-918, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 22, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 22, 2025Record 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=2.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Konstantin Vyatkin · is-localhost-ipversion=2.0.0

Published CVSS scores

6.9Fluid AttacksCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA: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

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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