CVE-2026-71271 json
Memos Webhook SSRF via 0.0.0.0 Reserved-IP Bypass
published 2026-08-05 3 mo ago modified 2026-10-24 15 d ago also EUVD-2026-53356
- cvss
- 8.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 26%
- public exploits
- 0
- none known
Summary
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.
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 3 mo ago
Exploit prediction
0.33% chance of exploitation in the next 30 days, higher than 26% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N |
Affected products
- usememos memos
Classification
- Weakness
-
- CWE-918 Server-Side Request Forgery
References
-
github.com
/usememos/memos
third-party-advisory
-
github.com
/usememos/memos/blob/main/internal/webhook/validate.go
third-party-advisory
Sources
- CVE List CVE-2026-71271
- NVD CVE-2026-71271
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.