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CVE-2026-46430— Algernon: Auto-refresh SSE event server binds to all interfaces by default on Linux/macOS

Quick assessment

Affected
xyproto algernon
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.

algernon是Alexander F. Rødseth个人开发者的一个 Web 服务器。 algernon 1.17.7之前版本存在安全漏洞，该漏洞源于SSE事件服务器默认绑定到0.0.0.0:5553，可能导致未经授权的网络访问。

CVSS 4.3 · Medium EPSS 0.20% · P10

Possible ATT&CK Techniques 1 AI

T1134 · Access Token Manipulation

Affected Version Matrix 1

VendorProduct Version RangeStatus
xyproto algernon < 1.17.7 affected
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I. Basic Information for CVE-2026-46430

Vulnerability Information
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Vulnerability Title
Algernon: Auto-refresh SSE event server binds to all interfaces by default on Linux/macOS
Source: CVE Program / CVE List V5
Vulnerability Description
Algernon is a small self-contained pure-Go web server. Prior to 1.17.7, the SSE event server bound to 0.0.0.0:5553 on Linux/macOS by default because the platform-dependent host default in engine/flags.go:39-46 set host = "" for non-Windows, and utils.JoinHostPort("", ":5553") resolves to ":5553". This vulnerability is fixed in 1.17.7.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
将资源暴露给错误范围
Source: CVE Program / CVE List V5
Vulnerability Title
algernon 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
algernon是Alexander F. Rødseth个人开发者的一个 Web 服务器。 algernon 1.17.7之前版本存在安全漏洞，该漏洞源于SSE事件服务器默认绑定到0.0.0.0:5553，可能导致未经授权的网络访问。
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
xyproto algernon < 1.17.7 -

II. Public POCs for CVE-2026-46430

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III. Intelligence Information for CVE-2026-46430

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Vendor Advisories for CVE-2026-46430 (1)

Same Patch Batch · xyproto · 2026-05-26 · 7 CVEs total

CVE-2026-45721 9.0 CRITICAL Algernon: handler.lua discovery walks parent directories above the server root
CVE-2026-48126 8.2 HIGH Algernon: Host header path traversal in --domain mode reads files and runs Lua from parent
CVE-2026-45728 7.5 HIGH Algernon: Single-file mode unconditionally enables debug mode
CVE-2026-46431 4.3 MEDIUM Algernon: Auto-refresh SSE event server sets Access-Control-Allow-Origin: *
CVE-2026-43981 Algernon: Race Condition in handle() shared LState
CVE-2026-43982 Algernon: Path traversal file write via savein()

IV. Related Vulnerabilities

Same product: algernon
Same vendor: xyproto
Same weakness: CWE-668

V. Comments for CVE-2026-46430

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