Bug 2542596 (CVE-2026-101911)

Summary: CVE-2026-101911 ip-address: ip-address: Denial of Service via unbounded IPv6 address parsing
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the ip-address library. A remote attacker can exploit this vulnerability by supplying an excessively large IPv6 address string to an application that parses input without length limits. The parser attempts to process the unbounded input and generate disproportionately large error diagnostics, leading to excessive memory consumption. This issue can lead to a Denial of Service (DoS) by causing the application process to stall or crash.
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Description OSIDB Bzimport 2026-09-28 18:04:17 UTC 
ip-address is a library for parsing and manipulating IPv4 and IPv6 addresses in JavaScript. Prior to 10.7.1, the Address6 constructor, Address6.isValid, and parse code in src/ipv6.ts accept unbounded strings and expand invalid characters through RE_BAD_CHARACTERS into large diagnostics. Material impact occurs only when an application accepts a very large attacker-controlled field and passes it to Address6 parsing without an earlier length bound. Common URL and header limits, and common body-parser defaults, generally constrain the effect; common defaults typically exclude 32 MiB fields. Megabyte-scale fields can cause a synchronous stall and high transient memory use, approximately 16 MiB can trigger an invalid string length exception, and process termination occurs at approximately 32 MiB. The affected entry points include Address6.isValid and construction paths that reach parse. This issue is fixed in version 10.7.1.