CVE-2021-32838— Regular Expression Denial of Service in flask-restx
Quick assessment
Affected
python-restx flask-restx
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
flask-restx是一个应用软件。叉Flask-RESTPlus:功能齐全的框架,用于快速、简单和记录API开发瓶 Flask-RESTX 0.5.1 版之前存在资源管理错误漏洞，该漏洞允许攻击者进行ReDoS（正则表达式拒绝服务）的攻击。
Possible ATT&CK Techniques 1 AI
T1499 · Endpoint Denial of Service
Get alerts for future matching vulnerabilities
Log in to subscribe
I. Basic Information for CVE-2021-32838
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗
Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
Regular Expression Denial of Service in flask-restx
Source: CVE Program / CVE List V5
Vulnerability Description
Flask-RESTX (pypi package flask-restx) is a community driven fork of Flask-RESTPlus. Flask-RESTX before version 0.5.1 is vulnerable to ReDoS (Regular Expression Denial of Service) in email_regex. This is fixed in version 0.5.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
flask-restx 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
flask-restx是一个应用软件。叉Flask-RESTPlus:功能齐全的框架,用于快速、简单和记录API开发瓶 Flask-RESTX 0.5.1 版之前存在资源管理错误漏洞，该漏洞允许攻击者进行ReDoS（正则表达式拒绝服务）的攻击。
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 |
|---|---|---|---|---|
| python-restx | flask-restx | < 0.5.1 | - |
|
II. Public POCs for CVE-2021-32838
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
Premium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2021-32838
请登录查看更多情报信息。
Patches & Fixes for CVE-2021-32838 (1)
Mailing List Discussions for CVE-2021-32838 (2)
-
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QUD6SWZLX52AAZUHDETJ2CDMQGEPGFL3/ vendor-advisory x_refsource_FEDORA
-
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5UCTFVDU3677B5OBGK4EF5NMUPJLL6SQ/ vendor-advisory x_refsource_FEDORA
Other References for CVE-2021-32838 (4)
-
https://pypi.org/project/flask-restx/ x_refsource_MISC
-
https://github.com/python-restx/flask-restx/issues/372 x_refsource_MISC
-
https://github.com/advisories/GHSA-3q6g-vf58-7m4g x_refsource_CONFIRM
IV. Related Vulnerabilities
Same weakness: CWE-400
-
CVE-2026-88932
multer vulnerable to Denial of Service via orphaned disk wri -
CVE-2026-90582
evanchiu serverless-todo API Todo Endpoint index.js saveTodo -
CVE-2026-90554
vLLM before 0.28.0 Denial of Service via audio extraction -
CVE-2026-50018
Hoverfly: Denial of Service via Goroutine Leak in Remote Pos -
CVE-2026-54135
AirSane has a Remote Denial of Service (OOM) via Unvalidated
V. Comments for CVE-2021-32838
No comments yet