CVE-2026-71272

HIGH 8.5

Memos Webhook DNS Rebinding TOCTOU SSRF in safeDialContext()

CVSS Score

8.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-367
Vendor	usememos
Product	memos
Published	Aug 5, 2026
Last Updated	Aug 10, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

Low

Availability

None

Affected Versions

usememos / memos

0 ≤ 0.29.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/usememos/memos github.com: https://github.com/usememos/memos/blob/main/internal/webhook/webhook.go

Credits

Alibek Baxtiyorov