CVE-2026-46430Public exploit

Filename disclosure via all-interface SSE binding

Published May 26, 2026 · Updated May 26, 2026

Information disclosure in xyproto Algernon 1.17.6 and earlier allows remote attackers to read file names and edit timing over SSE. The handleFlags default leaves host empty on Linux and macOS, and finalConfiguration passes it to JoinHostPort, binding SSE port 5553 on every interface. Auto-refresh must be enabled and the attacker must have adjacent-network reach; the stream reveals watched paths and change timing but cannot write files or interrupt service.

CVSS severity4.3
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in xyproto Algernon 1.17.6 and earlier allows remote attackers to read file names and edit timing over SSE. The handleFlags default leaves host empty on Linux and macOS, and finalConfiguration passes it to JoinHostPort, binding SSE port 5553 on every interface. Auto-refresh must be enabled and the attacker must have adjacent-network reach; the stream reveals watched paths and change timing but cannot write files or interrupt service.

The record

CVE
CVE-2026-46430
Published
May 26, 2026
Updated
May 26, 2026
Vendor
xyproto
Product
Algernon
Classifications
CWE-668, CWE-1188, T1083
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 26, 2026CVE publishedPublication date reported by the CVE source.
  2. May 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.17.7

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

xyproto · Algernonversion=< 1.17.7

Published CVSS scores

4.3GitHubCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-668Exposure of Resource to Wrong Sphere
CWE-1188Initialization of a Resource with an Insecure Default
T1083File and Directory Discovery

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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