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https://issues.apache.org/jira/browse/NET-747?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18128368#comment-18128368
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Aryan Ganjoo commented on NET-747:
----------------------------------
The proposed fix and regression test are in
https://github.com/apache/commons-net/pull/412. The default Maven build passed
locally on the final three-file commit; hosted CI and maintainer review are
pending.
> SubnetUtils6 rejects IPv4-mapped IPv6 literals and formats mapped range as
> IPv4
> -------------------------------------------------------------------------------
>
> Key: NET-747
> URL: https://issues.apache.org/jira/browse/NET-747
> Project: Commons Net
> Issue Type: Bug
> Affects Versions: 3.13.0
> Reporter: Aryan Ganjoo
> Priority: Major
>
> On current Commons Net master (39a85646d21002de4df6082342485dc2dedecd5a),
> SubnetUtils6 rejects valid IPv4-mapped IPv6 literals because
> InetAddress.getByName returns Inet4Address for ::ffff:0:0 and
> ::ffff:192.0.2.1. It also formats a high address inside ::ffff:0:0/96 as
> plain IPv4, which cannot round-trip through its IPv6 string API.
> Reproduction:
> 1. new SubnetUtils6("::ffff:0:0/96") throws IllegalArgumentException: Could
> not parse [::ffff:0:0] - not an IPv6 address.
> 2. new SubnetUtils6("::/80").getInfo().getHighAddress() returns
> 255.255.255.255 instead of an IPv6 literal; isInRange on that output then
> rejects it.
> Expected: mapped IPv6 literals remain 128-bit addresses throughout parsing,
> formatting and range checks. Plain IPv4 input such as 192.0.2.1 should remain
> rejected.
> A local two-file fix and regression test have been independently reviewed.
> The focused test was red on unmodified master (31 tests, one error) and green
> with the fix (31 tests, no failures/errors). The default Maven build is being
> checked separately; no PR or hosted CI result exists yet. This is distinct
> from NET-741, which introduced SubnetUtils6.
> Prepared with AI assistance.
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