CVE-2026-54272Public exploitNetwork attack vector

SSRF via unnormalized IPv4-embedded IPv6 addresses

Published Jul 27, 2026 · Updated Jul 27, 2026

SSRF in ip-address 10.1.1 through 10.2.0 allows remote attackers to reach internal services via crafted IPv4-embedded IPv6 addresses. Address6 classifiers inspect the IPv6 wrapper without normalizing its embedded IPv4 address, causing internal targets to be labeled non-internal. Exploitation requires a consuming application to use these results for trust decisions; NAT64 routing also requires a NAT64/DNS64 gateway.

CVSS severity6.9
Medium
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 ip-address 10.1.1 through 10.2.0 allows remote attackers to reach internal services via crafted IPv4-embedded IPv6 addresses. Address6 classifiers inspect the IPv6 wrapper without normalizing its embedded IPv4 address, causing internal targets to be labeled non-internal. Exploitation requires a consuming application to use these results for trust decisions; NAT64 routing also requires a NAT64/DNS64 gateway.

The record

CVE
CVE-2026-54272
Published
Jul 27, 2026
Updated
Jul 27, 2026
Vendor
Beau Gunderson
Product
ip-address
Classifications
CWE-918, CWE-20, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 10.1.1, < 10.2.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Beau Gunderson · ip-addressversion=>= 10.1.1, < 10.2.1

Published CVSS scores

6.9GitHubCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/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.

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

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)
CWE-20Improper Input Validation
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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