CVE-2026-71272

Memos Webhook DNS Rebinding TOCTOU SSRF in safeDialContext()

State: Published
Severity: 8.5 High
Published: Aug 5, 2026
Updated: Aug 10, 2026
Reserved: Aug 5, 2026

Description

Memos' webhook dispatch function safeDialContext (internal/webhook/webhook.go) resolves the target hostname via net.DefaultResolver.LookupHost and validates the resulting IPs against reserved ranges, but then dials net.JoinHostPort(host, port) using the original hostname rather than the already-validated IP address.

Scores

CVSS	Score	Vector	Source
3.1	8.5 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N	TuranSec

Weaknesses

CWE-367

Affected Products

Product	Versions
memosusememos	0.29.1 and earlierAffected

References

https://github.com/usememos/memosthird-party-advisory
https://github.com/usememos/memos/blob/main/internal/webhook/webhook.gothird-party-advisory

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