CVE-2026-55758Public exploitNetwork attack vector

Internal service access via omitted NAT64 prefix

Published Aug 27, 2026 · Updated Aug 27, 2026

SSRF in CC: Tweaked before 1.120.0 allows remote attackers to reach internal IPv4 services through RFC 8215 NAT64 addresses. AddressPredicate.PrivatePattern.matches() checks the RFC 6052 NAT64 range but omits 64:ff9b:1::/48, leaving mapped private IPv4 destinations unclassified. Exploitation requires a dual-stack server using RFC 8215 NAT64 and access to execute Lua; crafted HTTP or WebSocket requests can reach loopback, cloud metadata, private-network, and internal API endpoints.

CVSS severity6.9
Medium
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in CC: Tweaked before 1.120.0 allows remote attackers to reach internal IPv4 services through RFC 8215 NAT64 addresses. AddressPredicate.PrivatePattern.matches() checks the RFC 6052 NAT64 range but omits 64:ff9b:1::/48, leaving mapped private IPv4 destinations unclassified. Exploitation requires a dual-stack server using RFC 8215 NAT64 and access to execute Lua; crafted HTTP or WebSocket requests can reach loopback, cloud metadata, private-network, and internal API endpoints.

The record

CVE
CVE-2026-55758
Published
Aug 27, 2026
Updated
Aug 27, 2026
Vendor
CC: Tweaked
Product
CC: Tweaked
Classifications
CWE-918, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 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=< 1.120.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

CC: Tweaked · CC: Tweakedversion=< 1.120.0

Published CVSS scores

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