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CVE-2026-8468— Unbounded buffer accumulation in multipart header parsing causes denial of service in plug

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.

Plug是elixir-plug开源的一个面向Elixir生态的Web应用中间件与连接规范库。 Plug 1.15.4之前版本、1.16.3之前版本、1.17.1之前版本、1.18.2之前版本和1.19.2之前版本存在安全漏洞，该漏洞源于多部分标头解析中缓冲区累积无限制，可能导致未经身份验证的远程攻击者通过发送特制的multipart/form-data请求耗尽服务器内存。

AI Predicted 7.5 Difficulty: Easy EPSS 0.85% · P56

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 6

VendorProduct Version RangeStatus
elixir-plug plug 1.4.0< 1.15.4 affected
1.16.0< 1.16.3 affected
1.17.0< 1.17.1 affected
1.18.0< 1.18.2 affected
1.19.0< 1.19.2 affected
c52b2f32c90bccd718202bafccb5f95594e30183< * affected
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I. Basic Information for CVE-2026-8468

Vulnerability Information
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Vulnerability Title
Unbounded buffer accumulation in multipart header parsing causes denial of service in plug
Source: CVE Program / CVE List V5
Vulnerability Description
Allocation of Resources Without Limits or Throttling vulnerability in plug_project plug allows denial of service via unbounded buffer accumulation in multipart header parsing. 'Elixir.Plug.Conn':read_part_headers/2 in lib/plug/conn.ex does not obey its :length parameter. There is no upper bound on the size of the accumulated buffer. By contrast, the sibling function read_part_body has an explicit byte_size(acc) > length guard that stops accumulation once a limit is reached. No such guard exists in read_part_headers. An unauthenticated remote attacker can exhaust server memory by sending a crafted multipart/form-data request, causing a denial of service. This issue affects plug from 1.4.0 before 1.15.4, 1.16.3, 1.17.1, 1.18.2, and 1.19.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
Plug 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Plug是elixir-plug开源的一个面向Elixir生态的Web应用中间件与连接规范库。 Plug 1.15.4之前版本、1.16.3之前版本、1.17.1之前版本、1.18.2之前版本和1.19.2之前版本存在安全漏洞，该漏洞源于多部分标头解析中缓冲区累积无限制，可能导致未经身份验证的远程攻击者通过发送特制的multipart/form-data请求耗尽服务器内存。
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 1.4.0 ~ 1.15.4 cpe:2.3:a:plug_project:plug:*:*:*:*:*:*:*:*
elixir-plug plug c52b2f32c90bccd718202bafccb5f95594e30183 ~ * cpe:2.3:a:plug_project:plug:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-8468

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III. Intelligence Information for CVE-2026-8468

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Patches & Fixes for CVE-2026-8468 (5)

Vendor Advisories for CVE-2026-8468 (4)

IV. Related Vulnerabilities

Same product: plug
Same vendor: elixir-plug
Same weakness: CWE-770

V. Comments for CVE-2026-8468

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