What is CVE-2026-71272?

CVE-2026-71272 is a high-severity vulnerability in Usememos Memos, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 8.5/10. Published 2026-08-05.

How severe is CVE-2026-71272?

High severity. CVSS v3 base score is 8.5 out of 10.

Vulnerability in Usememos Memos

CVE-2026-71272

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.

Vulnerability class: TOCTOU (Time-of-Check to Time-of-Use)

EPSS: 0.002 (6.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N.

Affected products

Usememos Memos — versions 0

Weakness classification (CWE)

CWE-367 — Time-of-check Time-of-use (TOCTOU) Race Condition

References

309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c (third-party-advisory)
309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c (third-party-advisory)

Frequently asked questions

What is CVE-2026-71272?: CVE-2026-71272 is a high-severity vulnerability in Usememos Memos, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 8.5/10. Published 2026-08-05.
How severe is CVE-2026-71272?: High severity. CVSS v3 base score is 8.5 out of 10.