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MEDIUM 4.3 Go

Mattermost fails to canonicalize IPv4-mapped IPv6 addresses before reserved IP validation

GHSA-gqv7-j2j8-qmwq · CVE-2026-2455 · GO-2026-4746

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Description

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to canonicalize IPv4-mapped IPv6 addresses before reserved IP validation which allows an attacker to perform SSRF attacks against internal services via IPv4-mapped IPv6 literals (e.g., [::ffff:127.0.0.1]).. Mattermost Advisory ID: MMSA-2026-00585

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