CVE-2026-55484Public exploitNetwork attack vectorHinoki check available

Server crash via unchecked empty-path indexing

Published Aug 28, 2026 · Updated Aug 28, 2026

Uncaught exception in ALOS HTTP allows remote attackers to crash the server process with a question-mark-only request. sanitizeRequestPath strips the query into an empty path and indexes p[0] without a length check, causing an out-of-bounds panic before recovery middleware runs. A single unauthenticated HTTP/1.1 or HTTP/2 request reaches the parser and terminates the process; HTTP/3 is exposed when QUIC serving is enabled.

CVSS severity7.5
High
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Uncaught exception in ALOS HTTP allows remote attackers to crash the server process with a question-mark-only request. sanitizeRequestPath strips the query into an empty path and indexes p[0] without a length check, causing an out-of-bounds panic before recovery middleware runs. A single unauthenticated HTTP/1.1 or HTTP/2 request reaches the parser and terminates the process; HTTP/3 is exposed when QUIC serving is enabled.

The record

CVE
CVE-2026-55484
Published
Aug 28, 2026
Updated
Aug 28, 2026
Vendor
ALOS
Product
ALOS HTTP
Classifications
CWE-754, CWE-248, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 28, 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=< 0.0.0-20260617230736-314b6783e196

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ALOS · ALOS HTTPversion=< 0.0.0-20260617230736-314b6783e196

Published CVSS scores

7.5GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-754Improper Check for Unusual or Exceptional Conditions
CWE-248Uncaught Exception
T1499.004Application or System Exploitation

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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