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Fencer Vulns
high 8.7

CVE-2025-27611 json

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

published 2025-04-30 18 mo ago modified 2026-06-17 4 mo ago also GHSA-xq7p-g2vc-g82p , EUVD-2025-12752

cvss
8.7
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 39%
public exploits
0
none known

Summary

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.

Patch / fix

  • npm base-x 3.0.11, 4.0.1, 5.0.1
  • eap8-slf4j jboss enterprise application platform 8.0 2.0.17-1.redhat_00001.1.el8eap
  • eap8-neethi jboss enterprise application platform 8.0 3.2.1-1.redhat_00002.1.el8eap
  • eap8-wildfly jboss enterprise application platform 8.0 8.0.8-4.GA_redhat_00006.1.el8eap
  • eap8-narayana jboss enterprise application platform 8.0 6.0.6-1.Final_redhat_00001.1.el8eap
  • eap8-velocity jboss enterprise application platform 8.0 2.3.0-4.redhat_00010.1.el8eap
  • eap8-hibernate jboss enterprise application platform 8.0 6.2.36-1.Final_redhat_00001.1.el8eap
  • eap8-slf4j-api jboss enterprise application platform 8.0 2.0.17-1.redhat_00001.1.el8eap
  • eap8-apache-cxf jboss enterprise application platform 8.0 4.0.6-2.redhat_00001.1.el8eap

red hat advisories RHSA-2025:10452RHSA-2025:10453

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-27611 updated cvss 7.5

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

  • Red Hat JBoss EAP 8.0 for RHEL 8 eap8-neethi 3.2.1-1.redhat_00002.1.el8eap, eap8-slf4j 2.0.17-1.redhat_00001.1.el8eap, eap8-velocity 2.3.0-4.redhat_00010.1.el8eap, eap8-apache-cxf 4.0.6-2.redhat_00001.1.el8eap, eap8-slf4j-api 2.0.17-1.redhat_00001.1.el8eap, eap8-wildfly 8.0.8-4.GA_redhat_00006.1.el8eap, +50 more
    fixed: vendor fix “No mitigation is currently available that meets Red Hat Product Security’s standards for usability, deployment, applicability, or stability.” RHSA-2025:10452
  • Red Hat JBoss EAP 8.0 for RHEL 9 eap8-neethi 3.2.1-1.redhat_00002.1.el9eap, eap8-slf4j 2.0.17-1.redhat_00001.1.el9eap, eap8-velocity 2.3.0-4.redhat_00010.1.el9eap, eap8-apache-cxf 4.0.6-2.redhat_00001.1.el9eap, eap8-slf4j-api 2.0.17-1.redhat_00001.1.el9eap, eap8-wildfly 8.0.8-4.GA_redhat_00006.1.el9eap, +50 more
    fixed: vendor fix “No mitigation is currently available that meets Red Hat Product Security’s standards for usability, deployment, applicability, or stability.” RHSA-2025:10453
  • Red Hat JBoss Enterprise Application Platform 8.0.8
    fixed: vendor fix “No mitigation is currently available that meets Red Hat Product Security’s standards for usability, deployment, applicability, or stability.” RHSA-2025:10459
  • Red Hat JBoss Enterprise Application Platform Expansion Pack org.jboss.hal-hal-parent
    not affected: component not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
18 mo ago

Exploit prediction

0.45% chance of exploitation in the next 30 days, higher than 39% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
CNA 4.0 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected packages

ecosystem package affected fixed in
npm base-x
>=5.0.0, <5.0.1
>=4.0.0, <4.0.1
<3.0.11
5.0.1
4.0.1
3.0.11

Affected products

  • cryptocoinjs base-x

Classification

Weakness
  • CWE-1007 Insufficient Visual Distinction of Homoglyphs Presented to User

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.