CVE-2026-71271CWE-918ssrf

CVE-2026-71271

High · published August 5, 2026

CVSS v3.1
8.5
EPSS
0%
Percentile
24.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00328 · 24.6th percentile
Weakness
CWE-918 · Server-Side Request Forgery (SSRF)
Published
2026-08-05T17:24Z
References (2)
https://github.com/usememos/memos · 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2chttps://github.com/usememos/memos/blob/main/internal/webhook/validate.go · 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c
EPSS history
Timeline
  • 05 AUG 12:26Z
    Memos Webhook SSRF via 0.0.0.0 Reserved-IP Bypass
    cvelistv5