What’s Vulnerable › Vulnerabilities

CVE-2025-27611: base-x homograph attack allows Unicode lookalike characters to bypass validation.

• Severity: high (CVSS 8.7 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-04-30 · updated 2026-06-17
• Weakness: CWE-1007

Description

base-x is a base encoder and decoder of any given alphabet using bitcoin style leading zero compression. Versions 4.0.0, 5.0.0, and all prior to 3.0.11, are vulnerable to attackers potentially deceiving users into sending funds to an unintended address. This issue has been patched in versions 3.0.11, 4.0.1, and 5.0.1.

Affected products

• cryptocoinjs base-x: before 3.0.11; = 5.0.0, = 4.0.0

References

• https://github.com/cryptocoinjs/base-x/pull/86
• https://github.com/cryptocoinjs/base-x/security/advisories/GHSA-xq7p-g2vc-g82p

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