CVE-2025-27611

base-x homograph attack allows Unicode lookalike characters to bypass validation.

HIGH
8.7
CVSS Score
Published: April 30, 2025 at 07:36 PM UTC
Updated: June 17, 2026 at 09:03 AM UTC
1 product affected across 1 vendorBase X

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Severity
HIGH8.7
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 3.0.11= 4.0.0= 5.0.0
Affected range stops below 3.0.11, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.7HIGHGitHub_M
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-1007

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