Go/github.com/mattermost/mattermost/server/v8 CVE-2026-2455: medium 4.3, EPSS 0.17%
Mattermost fails to canonicalize IPv4-mapped IPv6 addresses before reserved IP validation
Action: Upgrade github.com/mattermost/mattermost/server/v8 to 8.0.0-20260129133647-5d787969c2d5 or later.
go get github.com/mattermost/mattermost/server/v8@v8.0.0-20260129133647-5d787969c2d5Affected
| introduced | fixed | last affected |
|---|---|---|
| 0 | 8.0.0-20260129133647-5d787969c2d5 | - |
Fixed versions
| 8.0.0-20260129133647-5d787969c2d5 |
Sources
- osv: GHSA-gqv7-j2j8-qmwq
- https://nvd.nist.gov/vuln/detail/CVE-2026-2455
- https://github.com/mattermost/mattermost/commit/5d787969c2d5ab591a9dcd61b0810475eed7a646
- https://github.com/mattermost/mattermost
- https://mattermost.com/security-updates
CVE-2026-2455 · published · modified · JSON