CVE-2026-71272 HIGH

CVE-2026-71272: Memos Webhook DNS Rebinding TOCTOU SSRF in safeDialContext()

Vendor Usememos
Product memos
Weakness CWE-367
Published August 5, 2026
Last update August 10, 2026
View on NVD All CVEs

CVSS base score

8.5/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality High
Integrity Low

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

August 5, 2026 CVE published
August 10, 2026 Record updated