What is CVE-2026-71271?

CVE-2026-71271 is a high-severity vulnerability in Usememos Memos, classified under Server-Side Request Forgery (SSRF). CVSS score: 8.5/10. Published 2026-08-05.

How severe is CVE-2026-71271?

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

SSRF in Usememos Memos

CVE-2026-71271

Memos' webhook URL validation, isReservedIP (internal/webhook/validate.go), checks a candidate IP against a reservedCIDRs list that omits 0.0.0.0/8 and never calls ip.IsUnspecified — unlike the correctly implemented sibling function isInternalIP in internal/httpgetter/html_meta.go, which does.

Vulnerability class: SSRF (Server-Side Request Forgery)

EPSS: 0.002 (15.3th 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-918 — Server-Side Request Forgery (SSRF)

References

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

Frequently asked questions

What is CVE-2026-71271?: CVE-2026-71271 is a high-severity vulnerability in Usememos Memos, classified under Server-Side Request Forgery (SSRF). CVSS score: 8.5/10. Published 2026-08-05.
How severe is CVE-2026-71271?: High severity. CVSS v3 base score is 8.5 out of 10.