Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-54892— Plug: quadratic-time decoding of nested query/body parameters enables denial of service

Quick assessment

Affected
elixir-plug plug
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.

elixir-plug plug是elixir-plug团队的一个Web应用程序组件框架。 elixir-plug plug存在资源管理错误漏洞，该漏洞源于嵌套参数解码器存在低效算法复杂度，可能导致未经身份验证的远程攻击者造成拒绝服务。以下版本受到影响：1.15.0至1.15.5之前版本、1.16.0至1.16.4之前版本、1.17.0至1.17.2之前版本、1.18.0至1.18.3之前版本和1.19.0至1.19.3之前版本。

AI Predicted 7.5 Difficulty: Easy EPSS 0.95% · P61

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 6

VendorProduct Version RangeStatus
elixir-plug plug 1.15.0< 1.15.5 affected
1.16.0< 1.16.4 affected
1.17.0< 1.17.2 affected
1.18.0< 1.18.3 affected
1.19.0< 1.19.3 affected
712b875d3442c765d8d37e546ffd5ad9f8afcc55< * affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-54892

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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.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
Plug: quadratic-time decoding of nested query/body parameters enables denial of service
Source: CVE Program / CVE List V5
Vulnerability Description
Inefficient algorithmic complexity in Plug's nested-parameter decoder allows an unauthenticated remote attacker to cause denial of service. Plug.Conn.Query.decode/4 (and Plug.Conn.Query.decode_each/2) parse query strings and application/x-www-form-urlencoded request bodies. When a key contains many bracketed segments such as a[a][a][a]=1, the decoder walks the brackets and, for each of the N levels, performs a map operation keyed on an ever-growing binary prefix of the key, hashing the full byte range at each step. The total decode cost is therefore quadratic in the number of nesting levels. With the default Plug.Parsers.URLENCODED body limit of 1,000,000 bytes, a single request can carry roughly 333,000 nesting levels and saturate a BEAM scheduler for minutes. A small number of concurrent requests can saturate all schedulers and render a Plug-based server unresponsive. No authentication or knowledge of application routes is required. This vulnerability is associated with program files lib/plug/conn/query.ex and program routines Plug.Conn.Query.decode/4, Plug.Conn.Query.decode_each/2, Plug.Conn.Query.split_keys/6, Plug.Conn.Query.insert_keys/3, and Plug.Conn.Query.finalize_pointer/2. This issue affects plug from 1.15.0 before 1.15.5, 1.16.4, 1.17.2, 1.18.3, and 1.19.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
算法复杂性
Source: CVE Program / CVE List V5
Vulnerability Title
elixir-plug plug 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
elixir-plug plug是elixir-plug团队的一个Web应用程序组件框架。 elixir-plug plug存在资源管理错误漏洞，该漏洞源于嵌套参数解码器存在低效算法复杂度，可能导致未经身份验证的远程攻击者造成拒绝服务。以下版本受到影响：1.15.0至1.15.5之前版本、1.16.0至1.16.4之前版本、1.17.0至1.17.2之前版本、1.18.0至1.18.3之前版本和1.19.0至1.19.3之前版本。
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
elixir-plug plug 1.15.0 ~ 1.15.5 cpe:2.3:a:elixir-plug:plug:*:*:*:*:*:*:*:*
elixir-plug plug 712b875d3442c765d8d37e546ffd5ad9f8afcc55 ~ * cpe:2.3:a:elixir-plug:plug:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-54892

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-54892

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-54892 (4)

Vendor Advisories for CVE-2026-54892 (3)

IV. Related Vulnerabilities

Same product: plug
Same vendor: elixir-plug
Same weakness: CWE-407

V. Comments for CVE-2026-54892

No comments yet

Leave a comment