Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-63403— Faktory: Unrecovered panic in command handlers allows full-server denial of service

Quick assessment

Affected
contribsys faktory
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

contribsys Faktory是contribsys公司开源的一个后台作业工作服务器。 contribsys faktory 1.10.0之前版本存在异常处理不当漏洞，该漏洞源于未验证有效载荷是否存在时对接收的命令行进行切片或索引操作，触发Go切片或索引越界panic，且命令分发路径中缺少recover()，导致未恢复的panic终止整个进程，可能造成拒绝服务。

CVSS 8.7 · High EPSS 0.45% · P37

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
contribsys faktory < 1.10.0 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-63403

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Faktory: Unrecovered panic in command handlers allows full-server denial of service
Source: CVE Program / CVE List V5
Vulnerability Description
Faktory is a language-agnostic background job server. In versions prior to 1.10.0, the server is vulnerable to an unauthenticated denial of service in which a single malformed command crashes the entire process. Its wire protocol is line-based, and several command handlers slice or index the received line at a fixed offset, such as cmd[5:] for PUSH or qs[0] for QUEUE, without checking that a payload is present. Sending a bare verb with no payload, for example PUSH, ACK, FAIL, BEAT, PUSHB, or QUEUE, triggers a Go slice or index out-of-range panic. Because the codebase has no recover() anywhere in the command-dispatch path, an unrecovered panic in a handler goroutine terminates the whole Go process rather than just that connection, instantly disconnecting every other client, worker, and in-flight job. The attack requires only a connection to the command port and completion of the trivial handshake, with no credentials when no password is configured, and can be repeated to keep the service down indefinitely. This issue is fixed in version 1.10.0.
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
未捕获的异常
Source: CVE Program / CVE List V5
Vulnerability Title
contribsys faktory 异常处理不当漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
contribsys Faktory是contribsys公司开源的一个后台作业工作服务器。 contribsys faktory 1.10.0之前版本存在异常处理不当漏洞，该漏洞源于未验证有效载荷是否存在时对接收的命令行进行切片或索引操作，触发Go切片或索引越界panic，且命令分发路径中缺少recover()，导致未恢复的panic终止整个进程，可能造成拒绝服务。
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
contribsys faktory < 1.10.0 -

II. Public POCs for CVE-2026-63403

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
Success marker: VULNERABLE: bare QUEUE triggered handler panic (log: "E 2026-08-28T00:06:53.130Z panic handling command: runtime error: index out of range [0] with length 0: `QUEUE`"); client received "+HI {\"v\":2} +OK -ERR internal error"; proof token PR
Reproduction recording is a Pro+ exclusive
Watch the full sandbox build + live exploit recording for this CVE. Limited-time ¥499/mo.
Upgrade to Pro+
Qwen3.6-35B-A3B · 8625 chars
GitHub 复现环境（可 clone 直接跑）
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-63403

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-63403 (1)

Vendor Advisories for CVE-2026-63403 (1)

IV. Related Vulnerabilities

Same product: faktory
Same vendor: contribsys
Same weakness: CWE-248

V. Comments for CVE-2026-63403

No comments yet

Leave a comment