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CVE-2026-32689— Long-poll NDJSON body splitting causes unbounded memory allocation in Phoenix

Quick assessment

Affected
phoenixframework phoenix
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.

phoenix是Phoenix framework开源的一款Web开发框架。 phoenix 1.7.0至1.7.22之前版本和1.8.6版本存在安全漏洞，该漏洞源于长轮询传输的NDJSON主体处理中资源分配无限制，可能导致拒绝服务攻击。

AI Predicted 7.5 Difficulty: Easy EPSS 0.52% · P43

Affected Version Matrix 3

VendorProduct Version RangeStatus
phoenixframework phoenix 1.7.0< 1.7.22 affected
1.8.0< 1.8.6 affected
2674c6ea30634667f9b09966b90269393b445953< * affected
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I. Basic Information for CVE-2026-32689

Vulnerability Information
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Vulnerability Title
Long-poll NDJSON body splitting causes unbounded memory allocation in Phoenix
Source: CVE Program / CVE List V5
Vulnerability Description
Allocation of Resources Without Limits or Throttling vulnerability in phoenixframework phoenix allows a denial of service via the long-poll transport's NDJSON body handling. In 'Elixir.Phoenix.Transports.LongPoll':publish/4, when a POST request is received with Content-Type: application/x-ndjson, the request body is split on newline characters using String.split/2 with no limit on the number of resulting segments. An attacker can send a body consisting entirely of newline bytes, causing a 1:1 amplification into a list of empty binaries — a 1 MB body produces approximately one million list elements, an 8 MB body approximately 8.4 million. Each element is then walked by Enum.map, materializing another list of the same size. This exhausts BEAM memory and schedulers, crashing the node and terminating all active sessions. A session token required to reach the vulnerable endpoint is freely obtainable by any client via an unauthenticated GET request to the same URL with a matching Origin header, making this attack effectively unauthenticated. This issue affects phoenix: from 1.7.0 before 1.7.22 and 1.8.6.
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
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
phoenix 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
phoenix是Phoenix framework开源的一款Web开发框架。 phoenix 1.7.0至1.7.22之前版本和1.8.6版本存在安全漏洞，该漏洞源于长轮询传输的NDJSON主体处理中资源分配无限制，可能导致拒绝服务攻击。
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
phoenixframework phoenix 1.7.0 ~ 1.7.22 cpe:2.3:a:phoenixframework:phoenix:*:*:*:*:*:*:*:*
phoenixframework phoenix 2674c6ea30634667f9b09966b90269393b445953 ~ * cpe:2.3:a:phoenixframework:phoenix:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-32689

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III. Intelligence Information for CVE-2026-32689

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Patches & Fixes for CVE-2026-32689 (2)

Vendor Advisories for CVE-2026-32689 (3)

IV. Related Vulnerabilities

Same product: phoenix
Same vendor: phoenixframework
Same weakness: CWE-770

V. Comments for CVE-2026-32689

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