CVE-2026-63403Network attack vector

Server crash via unchecked command slicing

Published Aug 25, 2026 · Updated Aug 25, 2026

Denial of service in Contributed Systems Faktory before 1.10.0 allows remote attackers to crash the server with malformed commands. The queue, pushBulk, push, ack, fail, and heartbeat handlers slice or index bare command lines without verifying that a payload exists. A connection to port 7419 and the HELLO handshake reach the flaw; no credentials are needed when no password is configured, and the uncaught panic terminates all client and worker connections.

CVSS severity8.6
High
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Contributed Systems Faktory before 1.10.0 allows remote attackers to crash the server with malformed commands. The queue, pushBulk, push, ack, fail, and heartbeat handlers slice or index bare command lines without verifying that a payload exists. A connection to port 7419 and the HELLO handshake reach the flaw; no credentials are needed when no password is configured, and the uncaught panic terminates all client and worker connections.

The record

CVE
CVE-2026-63403
Published
Aug 25, 2026
Updated
Aug 25, 2026
Vendor
Contributed Systems
Product
Faktory
Classifications
CWE-248, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 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=< 1.10.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Contributed Systems · Faktoryversion=< 1.10.0

Published CVSS scores

8.6GitHubCVSS: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 exploitUnconfirmed

Weakness, pattern, technique

CWE-248Uncaught Exception
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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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