SSRF bypass via CIDR-masked address classification
Published Aug 3, 2026 · Updated Aug 3, 2026
Improper input validation in ip-address 10.1.1 through 10.2.1 allows remote attackers to bypass network trust checks with a CIDR suffix. The isInSubnet guard returns false before comparing address bits when an input prefix is shorter than a special-use range, so classifiers treat internal hosts as external. Exploitation requires an application to accept bare address strings with suffixes and use these classifiers for access decisions, enabling requests to internal resources.
Summary
What happened
Improper input validation in ip-address 10.1.1 through 10.2.1 allows remote attackers to bypass network trust checks with a CIDR suffix. The isInSubnet guard returns false before comparing address bits when an input prefix is shorter than a special-use range, so classifiers treat internal hosts as external. Exploitation requires an application to accept bare address strings with suffixes and use these classifiers for access decisions, enabling requests to internal resources.
The record
- CVE
- CVE-2026-69198
- Published
- Aug 3, 2026
- Updated
- Aug 3, 2026
- Vendor
- Beau Gunderson
- Product
- ip-address
- Classifications
- CWE-20, CWE-918
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 3, 2026CVE publishedPublication date reported by the CVE source.
- Aug 3, 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.
- Affected versionversion=>= 10.1.1, < 10.2.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
- Upstream CIDR-suffix classifier proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo