CVE-2023-43644 — Vulnerability in github.com/sagernet/sing-box —...

CRITICAL

sing-box vulnerable to improper authentication in the SOCKS inbound

Published September 26, 2023Updated September 10, 2026Source: osv

Summary

### Impact This vulnerability allows specially crafted requests to bypass authentication, affecting all SOCKS inbounds with user authentication. ### Patches Update to sing-box 1.4.5 or 1.5.0-rc.5 and later versions. ### Workarounds Don't expose the SOCKS5 inbound to insecure environments.

Advisory Timeline

First published September 26, 2023 (1112 days ago).
Last revised September 10, 2026 — 1079 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Update github.com/sagernet/sing-box to 1.5.0-rc.5 or later

go get github.com/sagernet/sing-box@v1.5.0-rc.5

Update github.com/sagernet/sing to 0.2.12-0.20230925092853-5b05b5c147d9 or later

go get github.com/sagernet/sing@v0.2.12-0.20230925092853-5b05b5c147d9

Update github.com/sagernet/sing-box to 1.4.5 or later

go get github.com/sagernet/sing-box@v1.4.5

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (3)

Affects 1 ecosystem: go (2).

Package	Ecosystem	Affected	Fixed In
github.com/sagernet/sing-box	go	All versions	1.5.0-rc.5
github.com/sagernet/sing	go	All versions	0.2.12-0.20230925092853-5b05b5c147d9
github.com/sagernet/sing-box	go	All versions	1.4.5

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CWE-306
View on MITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.1 score means for each attack dimension.

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

References

Frequently Asked Questions

What is CVE-2023-43644?: sing-box vulnerable to improper authentication in the SOCKS inbound This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.1/10).
How do I check if my project is affected by CVE-2023-43644?: CVE-2023-43644 affects github.com/sagernet/sing-box and github.com/sagernet/sing. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2023-43644 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score

9.1

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-r5hm-mp3j-285g

GO-2023-2077

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