CVE-2026-44492: axios's shouldBypassProxy does not recognize IPv4-mapped IPv6 addresses, allowing NO_PROXY bypass (incomplete fix for CVE-2025-62718)
(updated )
shouldBypassProxy, introduced in v1.15.0 to fix CVE-2025-62718, does not normalise IPv4-mapped IPv6 addresses. When NO_PROXY lists an IPv4 address such as 127.0.0.1 or 169.254.169.254, a request URL using the IPv4-mapped IPv6 form (::ffff:7f00:1, ::ffff:a9fe:a9fe) still routes through the configured proxy. Node.js resolves these addresses to the underlying IPv4 host, so the request reaches the internal service via the proxy rather than being blocked.
References
- access.redhat.com/errata/RHSA-2026:20889
- access.redhat.com/errata/RHSA-2026:20938
- access.redhat.com/errata/RHSA-2026:26234
- access.redhat.com/errata/RHSA-2026:27044
- access.redhat.com/errata/RHSA-2026:27063
- access.redhat.com/errata/RHSA-2026:28964
- access.redhat.com/errata/RHSA-2026:29082
- access.redhat.com/errata/RHSA-2026:29197
- access.redhat.com/errata/RHSA-2026:30650
- access.redhat.com/errata/RHSA-2026:30651
- access.redhat.com/errata/RHSA-2026:33005
- access.redhat.com/errata/RHSA-2026:33155
- access.redhat.com/errata/RHSA-2026:33160
- access.redhat.com/errata/RHSA-2026:33163
- access.redhat.com/errata/RHSA-2026:33173
- access.redhat.com/errata/RHSA-2026:33183
- access.redhat.com/errata/RHSA-2026:33574
- access.redhat.com/errata/RHSA-2026:34766
- access.redhat.com/errata/RHSA-2026:36108
- access.redhat.com/errata/RHSA-2026:36611
- access.redhat.com/errata/RHSA-2026:36754
- access.redhat.com/errata/RHSA-2026:36820
- access.redhat.com/errata/RHSA-2026:36882
- access.redhat.com/errata/RHSA-2026:36883
- access.redhat.com/errata/RHSA-2026:40119
- access.redhat.com/errata/RHSA-2026:40138
- access.redhat.com/errata/RHSA-2026:40262
- access.redhat.com/errata/RHSA-2026:41031
- access.redhat.com/errata/RHSA-2026:41055
- access.redhat.com/errata/RHSA-2026:41064
- access.redhat.com/errata/RHSA-2026:41066
- access.redhat.com/security/cve/CVE-2026-44492
- bugzilla.redhat.com/show_bug.cgi?id=2487938
- github.com/advisories/GHSA-pjwm-pj3p-43mv
- github.com/axios/axios/security/advisories/GHSA-pjwm-pj3p-43mv
- nvd.nist.gov/vuln/detail/CVE-2025-62718
- nvd.nist.gov/vuln/detail/CVE-2026-44492
- security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44492.json
Code Behaviors & Features
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