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CVE-2026-71272— Memos Webhook DNS Rebinding TOCTOU SSRF in safeDialContext()

Quick assessment

Affected
usememos memos
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

usememos memos是usememos团队开源的一个文档管理工具。 usememos memos 0.29.1及之前版本存在竞争条件问题漏洞，该漏洞源于webhook派发函数safeDialContext()在DNS解析验证后使用原始主机名进行连接，存在时间差竞争条件，可能允许攻击者通过DNS重绑定绕过SSRF保护。

CVSS 8.5 · High EPSS 0.26% · P15

Affected Version Matrix 1

VendorProduct Version RangeStatus
usememos memos ≤ 0.29.1 affected
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I. Basic Information for CVE-2026-71272

Vulnerability Information
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Vulnerability Title
Memos Webhook DNS Rebinding TOCTOU SSRF in safeDialContext()
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
检查时间与使用时间(TOCTOU)的竞争条件
Source: CVE Program / CVE List V5
Vulnerability Title
usememos memos 竞争条件问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
usememos memos是usememos团队开源的一个文档管理工具。 usememos memos 0.29.1及之前版本存在竞争条件问题漏洞，该漏洞源于webhook派发函数safeDialContext()在DNS解析验证后使用原始主机名进行连接，存在时间差竞争条件，可能允许攻击者通过DNS重绑定绕过SSRF保护。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
usememos memos 0 ~ 0.29.1 -

II. Public POCs for CVE-2026-71272

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8794 chars
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POC zip download
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III. Intelligence Information for CVE-2026-71272

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Patches & Fixes for CVE-2026-71272 (1)

Other References for CVE-2026-71272 (1)

IV. Related Vulnerabilities

Same product: memos
Same vendor: usememos
Same weakness: CWE-367

V. Comments for CVE-2026-71272

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