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TI-2026-04006 Aliases CVE-2026-4602GHSA-8qwj-4jxw-m8jw

Incorrect numeric conversion in jsrsasign

Priority HIGH 77CWE-681Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 7 fixed, 1 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA, GitHub and Red Hat.

Summary

Versions of the package jsrsasign before 11.1.1 are vulnerable to Incorrect Conversion between Numeric Types due to handling negative exponents in ext/jsbn2.js. An attacker can force the computation of incorrect modular inverses and break signature verification by calling modPow with a negative exponent.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00499 42nd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial jsrsasign: 11.1.1jsrsasign (npm): 11.1.1Red Hat: 7 advisoriesRed Hat: 7 fixed, 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
—jsrsasignbefore 11.1.111.1.1Patch availableCNA
—org.webjars.npm:jsrsasignall versions—No fix listedCNA
—jsrsasign (npm)before 11.1.111.1.1Patch availableGHSA-8qwj-4jxw-m8jw
  • jsrsasign Vendor— Affected before 11.1.1 Fixed in 11.1.1 Patch available CNA
  • org.webjars.npm:jsrsasign Vendor— Affected all versions Fixed in — No fix listed CNA
  • jsrsasign (npm) Vendor— Affected before 11.1.1 Fixed in 11.1.1 Patch available GHSA-8qwj-4jxw-m8jw

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:kjur:jsrsasign:*:*:*:*:*:node.js:*:*before 11.1.1VulnerableKjur
  • cpe:2.3:a:kjur:jsrsasign:*:*:*:*:*:node.js:*:* Versions before 11.1.1 Vulnerable ·Kjur

Remediation

  • Fix · CNA jsrsasign Fixed in 11.1.1
  • Fix · GHSA-8qwj-4jxw-m8jw jsrsasign (npm) Fixed in 11.1.1 Advisory →

Red Hat 7 advisories

  • RHSA-2026:19410 Released 2026-05-19 · Red Hat rating Important
    MTV RHEL9 Images
    • Migration Toolkit for Virtualization 2.9 registry.redhat.io/migration-toolkit-virtualization/mtv-console-plugin-rhel9
  • RHSA-2026:19409 Released 2026-05-19 · Red Hat rating Important
    MTV RHEL9 Images
    • Migration Toolkit for Virtualization 2.10 registry.redhat.io/migration-toolkit-virtualization/mtv-console-plugin-rhel9
  • RHSA-2026:19375 Released 2026-05-19 · Red Hat rating Important
    Red Hat Quay 3.16.4
    • Red Hat Quay 3.16 registry.redhat.io/quay/quay-rhel9
Show 4 more Red Hat advisories
  • RHSA-2026:6926 Released 2026-04-07 · Red Hat rating Important
    Red Hat Quay 3.9.20
    • Red Hat Quay 3.9 registry.redhat.io/quay/quay-rhel8
  • RHSA-2026:6912 Released 2026-04-07 · Red Hat rating Important
    Red Hat Quay 3.10.20
    • Red Hat Quay 3.10 registry.redhat.io/quay/quay-rhel8
  • RHSA-2026:6720 Released 2026-04-06 · Red Hat rating Important
    Red Hat Quay 3.12.16
    • Red Hat Quay 3.12 registry.redhat.io/quay/quay-rhel8
  • RHSA-2026:6568 Released 2026-04-03 · Red Hat rating Important
    Red Hat Quay 3.15.4
    • Red Hat Quay 3.15 registry.redhat.io/quay/quay-rhel8

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    jsrsasign 11.1.1

    6 records Highest priority Priority HIGH 3 HIGH, 2 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-04002 Infinite loop in jsrsasignPriority HIGH 77
    • TI-2026-04004 Improper signature verification in jsrsasignPriority HIGH 74
    • TI-2026-04003 Versions of the package jsrsasign from 7.0.0 and before 11.1.1 are vulnerable to…Priority MEDIUM 49
    Show all 6 records →

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Migration Toolkit for VirtualizationAffectedNo fix planned: Will not fix
Migration Toolkit for Virtualization 2.10Fixed RHSA-2026:19409
Migration Toolkit for Virtualization 2.9Fixed RHSA-2026:19410
Red Hat Quay 3.10Fixed RHSA-2026:6912
Red Hat Quay 3.12Fixed RHSA-2026:6720
Red Hat Quay 3.15Fixed RHSA-2026:6568
Red Hat Quay 3.16Fixed RHSA-2026:19375
Red Hat Quay 3.9Fixed RHSA-2026:6926
Not affected: 7 products
  • Migration Toolkit for Virtualization 2.10
  • Migration Toolkit for Virtualization 2.9
  • Red Hat Quay 3.10
  • Red Hat Quay 3.12
  • Red Hat Quay 3.15
  • Red Hat Quay 3.16
  • Red Hat Quay 3.9

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-4602
  2. 2026-10-03 Alias added: GHSA-8qwj-4jxw-m8jw
  3. 2026-10-09 Affected versions changed · Red Hat
  4. 2026-10-16 Fix available: Migration Toolkit for Virtualization 2.10 · Red Hat
  5. 2026-10-25 EPSS moved to the below the 50th percentile

References

Exploit 1

Patch 1

Advisory 1

Other 12

  • TI-2026-04002 Infinite loop in jsrsasign CVSS 4.0HIGH 8.7
  • TI-2026-04004 Improper signature verification in jsrsasign CVSS 4.0CRITICAL 9.1
  • TI-2026-04003 Versions of the package jsrsasign from 7.0.0 and before 11.1.1 are vulnerable to… CVSS 4.0CRITICAL 9.3
  • TI-2020-11771 An issue was discovered in the jsrsasign package before 8.0.17 for Node.js. CVSS 3.1CRITICAL 9.8
  • TI-2020-11770 An issue was discovered in the jsrsasign package before 8.0.18 for Node.js. CVSS 3.1CRITICAL 9.8
  • TI-2022-09454 Improper verification of cryptographic signature in jsrsasign CVSS 3.1CRITICAL 9.8
See all 11 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences