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Fencer Vulns
medium 5.3

CVE-2026-2739 json

bn.js affected by an infinite loop

published 2026-02-20 8 mo ago modified 2026-09-10 1 mo ago also GHSA-378v-28hj-76wf , EUVD-2026-8025

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 45%
public exploits
0
none known

Summary

This affects versions of the package bn.js before 5.2.3. Calling maskn(0) on any BN instance corrupts the internal state, causing toString(), divmod(), and other methods to enter an infinite loop, hanging the process indefinitely.

Patch / fix

  • npm bn.js 4.12.3, 5.2.3
  • n/a bn.js 5.2.3
  • node-bn.js Debian 14 5.2.3+~5.2.0-1

debian advisories DEBIAN-CVE-2026-2739

  • velociraptor openSUSE Tumbleweed 0.7.0.4.git185.a5708584-2.1

opensuse advisories openSUSE-SU-2026:11126-1

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-2026-2739 updated cvss 5.3

bn.js: bn.js: Denial of Service via calling maskn(0)

  • Red Hat Logging Subsystem for Red Hat OpenShift openshift-logging/kibana6-rhel8, openshift-logging/elasticsearch6-rhel9, openshift-logging/logging-curator5-rhel9, openshift-logging/elasticsearch-proxy-rhel9, openshift-logging/elasticsearch-rhel9-operator, openshift-logging/elasticsearch-operator-bundle
    affected: no fix planned “Out of support scope”
  • Red Hat OpenShift Pipelines openshift-pipelines/pipelines-hub-ui-rhel8, openshift-pipelines/pipelines-hub-ui-rhel9
    affected: no fix available “Fix deferred”
  • Red Hat OpenShift Service Mesh 2 openshift-service-mesh/kiali-ossmc-rhel8
    affected: no fix planned “Out of support scope”
  • Red Hat OpenShift Service Mesh 3 openshift-service-mesh/kiali-ossmc-rhel9, openshift-service-mesh/kiali-rhel9-operator, openshift-service-mesh/kiali-operator-bundle
    affected: no fix available, no fix planned “Out of support scope”
  • Red Hat 3scale API Management Platform 2 3scale-amp20/system, 3scale-amp21/system, 3scale-amp22/system, 3scale-amp24/system, 3scale-amp25/system, 3scale-amp26/system, +3 more
    affected: no fix planned “Out of support scope”
  • Red Hat build of Apicurio Registry 2 io.apicurio-apicurio-registry Red Hat Developer Hub 1 rhdh/rhdh-hub-rhel9 Red Hat Enterprise Linux 8 pcs, grafana, mozjs60, pcs-snmp, grafana-loki, grafana-mssql, +11 more
    affected: no fix available “Fix deferred”
  • Red Hat Enterprise Linux 9 gjs, pcs, polkit, pcs-snmp, polkit-libs
    affected: no fix available, no fix planned “Out of support scope”
  • Red Hat Fuse 7 io.apicurio-apicurito, io.syndesis-syndesis-parent
    affected: no fix planned “Out of support scope”
show 4 more
  • Red Hat OpenShift Container Platform 4 openshift4/ose-console, openshift4/ose-console-rhel9 Red Hat OpenShift Dev Spaces devspaces/dashboard-rhel9
    affected: no fix available “Fix deferred”
  • Red Hat Process Automation 7 org.uberfire-uberfire-parent, org.kie.workbench-kie-wb-common, org.kie-process-migration-service
    affected: no fix planned “Out of support scope”
  • Red Hat Quay 3 quay/quay-rhel8, quay/quay-rhel9
    affected: no fix available, no fix planned “Out of support scope”
  • Red Hat streams for Apache Kafka 2 com.github.streamshub-console Red Hat streams for Apache Kafka 3 com.github.streamshub-console
    affected: no fix available “Fix deferred”

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
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
8 mo ago

Exploit prediction

0.53% chance of exploitation in the next 30 days, higher than 45% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 6.9 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P
CNA 4.0 5.5 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/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
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
GitHub 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected packages

ecosystem package affected fixed in
npm bn.js
<4.12.3
>=5.0.0, <5.2.3
4.12.3
5.2.3

Affected products

  • n/a bn.js

Classification

Weakness
  • CWE-835 Loop with Unreachable Exit Condition

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.