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ip-address (npm) EUVDEUVD-2026-88396

| CVE-2026-101912 MEDIUM
Incorrect Comparison (CWE-697)
2026-09-28 GitHub_M GHSA-j6r3-76f7-8jcv
6.3
CVSS 4.0 · Vendor: GitHub_M
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Severity by source

Vendor (GitHub_M) PRIMARY
6.3 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
3.7 LOW

AC:H because it needs a cross-family comparison with matching leading bits and an app that uses the method for a security decision; integrity-only (I:L), no C/A impact.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
4.0 AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
SUSE
5.3 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Red Hat
5.3 MEDIUM
qualitative

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

5
Patch available
Sep 28, 2026 - 19:01 EUVD
Metadata Corrected
Sep 28, 2026 - 18:40 vuln.today
tag: JavaScript added
Metadata Corrected
Sep 28, 2026 - 18:40 vuln.today
tag: npm added
Analysis Generated
Sep 28, 2026 - 18:23 vuln.today
CVE Published
Sep 28, 2026 - 17:48 cve.org
MEDIUM 6.3

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 1 npm packages depend on ip-address (1 direct, 0 indirect)

Ecosystem-wide dependent count for version 10.7.1.

DescriptionCVE.org

ip-address is a library for parsing and manipulating IPv4 and IPv6 addresses in JavaScript. Prior to 10.7.1, the isInSubnet and isHostInSubnet methods in src/common.ts compare masked binary strings without validating that both operands use the same IP family. A cross-family containment check whose leading address bits match makes the masked strings compare equal even though IPv4 and IPv6 do not share an address space. An allowlist or denylist decision can therefore classify an address outside the intended range as contained. This issue is fixed in version 10.7.1.

AnalysisAI

Cross-family subnet comparisons in the ip-address npm library (all versions before 10.7.1) can cause isInSubnet and isHostInSubnet to report that an address falls inside a range it does not belong to, allowing an allowlist or denylist decision built on those predicates to misclassify an out-of-scope address as trusted. The flaw is a logic/comparison error (CWE-697) rather than a memory-safety issue: masked binary strings are compared without first confirming that the address and the subnet share the same IP family, so an IPv4 address checked against an IPv6 mask (or vice versa) can compare equal when the leading masked bits align. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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Exploit
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the consuming application invoke ip-address's isInSubnet or isHostInSubnet methods to make an allowlist/denylist or trust-boundary decision, AND that it pass attacker-influenced addresses where an IPv4 and IPv6 address are compared against each other (a cross-family containment check). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment This is a logic/comparison flaw (CWE-697) in the widely-used ip-address npm library, not a memory-safety or code-execution bug. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Vendor-released patch: 10.7.1. … Detailed patch versions, workarounds, and compensating controls in full report.

Threat intelligence, references, and detailed analysis are available after sign-in.

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise High Performance Computing 12 Affected
SUSE Linux Enterprise Module for Web and Scripting 15 SP7 Affected
SUSE Linux Enterprise Module for Web and Scripting 15 SP7 Affected
SUSE Linux Enterprise Server 15 SP7 Affected
SUSE Linux Enterprise Server 15 SP7 Affected

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EUVD-2026-88396 vulnerability details – vuln.today

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