# CVE-2026-77151: lin-snow Ech0 weak cryptographic algorithm in MD5Encrypt

Source: https://junglewise.ai/threats/cve-2026-77151-lin-snow-ech0-weak-cryptographic-algorithm-in-md5encrypt  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-20. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-77151 · Severity: low · CVSS 3.7 · Published 2026-08-20

Ech0 is an open-source publishing platform for personal idea sharing. A security flaw in its password encryption function uses MD5, a cryptographically weak algorithm that makes encrypted credentials vulnerable to brute-force attacks. Remote exploitation is possible but requires significant effort, and upgrading to version 5.4.2 resolves the issue.

Technologies: [Lin-Snow Ech0](https://junglewise.ai/threats/technologies/ech0). Vendors: [Lin-Snow](https://junglewise.ai/threats/vendors/lin-snow).

## Quick answers

**Is CVE-2026-77151 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-77151 being exploited in the wild.

**How severe is CVE-2026-77151?** Low severity, with a CVSS score of 3.7, published 20 August 2026.

**Which products and versions are affected?** Lin-Snow Ech0 up to 5.4.1.

**Is there a fix for CVE-2026-77151?** A patch was published on 2026-07-07: Patch commit 9ce19a3b0d0765086a655f45d3a706ec1810404f migrates to bcrypt Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-77151 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-77151?** Check whether you run Lin-Snow Ech0 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability stems from the use of MD5 for password hashing in the MD5Encrypt function within internal/util/crypto/crypto.go. MD5 is considered cryptographically broken and unsuitable for password hashing due to its susceptibility to collision attacks and rapid hash computation. The function is used for local authentication, and the vulnerability can be exploited remotely by attackers who obtain password hashes to perform dictionary or brute-force attacks. A patch (commit 9ce19a3b0d0765086a655f45d3a706ec1810404f) migrates password storage to bcrypt, a proper password hashing algorithm. Upgrading to version 5.4.2 or later is recommended.

## Affected products

- lin-snow Ech0 up to 5.4.1

## Timeline

- 2026-08-20: disclosed
- 2026-07-07: patched: Patch commit 9ce19a3b0d0765086a655f45d3a706ec1810404f migrates to bcrypt

## References

- [https://github.com/lin-snow/Ech0/](https://github.com/lin-snow/Ech0/)
- [https://github.com/lin-snow/Ech0/commit/9ce19a3b0d0765086a655f45d3a706ec1810404f](https://github.com/lin-snow/Ech0/commit/9ce19a3b0d0765086a655f45d3a706ec1810404f)

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