Vulnerability · Published Aug 5, 2026 · Assigned by TuranSec
CVE-2026-71272Memos Webhook DNS Rebinding TOCTOU SSRF in safeDialContext()
High 8.5
In plain English
A high-severity security flaw in memos from usememos. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 17% of all known vulnerabilities).
Severity (CVSS 3.1)8.5High
Exploit odds (30 days)0.3%top 82.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
Weakness: CWE-367 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
References
- https://github.com/usememos/memos third-party-advisory
- https://github.com/usememos/memos/blob/main/internal/webhook/webhook.go third-party-advisory