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

Goal: 1000 CNY · Raised: 1336 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.

Faktory 是一种语言无关的后台作业服务器。在 1.10.0 之前的版本中，该服务器存在一个未认证的拒绝服务漏洞：单个格式错误的命令会导致整个进程崩溃。其 wire 协议基于行结构，多个命令处理程序在未检查有效载荷是否存在的条件下，直接对接收到的行在固定偏移量处进行切片或索引操作，例如对 PUSH 命令使用 cmd[5:]，对 QUEUE 命令使用 qs[0]。当发送仅包含动词而无有效载荷的命令（例如 PUSH、ACK、FAIL、BEAT、PUSHB 或 QUEUE）时，会触发 Go 语言的切片或索引越界 pa

CVSS 8.7 · High

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.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

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 Premium
Qwen3.6-35B-A3B · 8625 chars
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