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Full vulnerability report · 2026
CVE-2026-4599High confidence

n/a jsrsasign: Incomplete Comparison with Missing Factors

n/a · jsrsasign

9.3CriticalCVSS 4.0
Recommended action
Within 72 hours

Critical technical impact with a remotely reachable, unauthenticated path and a public exploit reference; no CISA KEV confirmation is currently recorded.

Patch available
Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

1 current
CVE-2026-4599 · CSAF 2.0 · revision 3 · finalRed Hat Product Securityjsrsasign: jsrsasign: Private key recovery via incomplete comparison checks biasing DSA nonces
19 fixed

The vendor explicitly identifies these products or versions as containing the fix.

  • registry.redhat.io/migration-toolkit-virtualization/mtv-console-plugin-rhel9@sha256:0b1a46357b43429aa2729b7caa728969a0d2cf306f56cbf3607acb78ac95b099_amd64 as a component of Migration Toolkit for Virtualization 2.1
  • registry.redhat.io/migration-toolkit-virtualization/mtv-console-plugin-rhel9@sha256:ac92e8f85699adfd5517fa9bbeb34833a4f9f9b0ccbfa3a55c0d9822976dadfc_amd64 as a component of Migration Toolkit for Virtualization 2.9
  • registry.redhat.io/quay/quay-rhel8@sha256:356815af5f87ce3a8e0ee8213bb9b5537b658f29338b51f63672c7e5d7a5a50b_amd64 as a component of Red Hat Quay 3.12
  • registry.redhat.io/quay/quay-rhel8@sha256:82a11b494b47a72a72edbbb595998ad0a00ade358acdffc58fb07217bdf9c67f_arm64 as a component of Red Hat Quay 3.12
  • registry.redhat.io/quay/quay-rhel8@sha256:c8bdf44dcdd96608b3dbb3c07bacbaa06d17e6e5333881559425edc53051f100_s390x as a component of Red Hat Quay 3.12
  • registry.redhat.io/quay/quay-rhel8@sha256:cd330fe833ad4ffa7fa3f2837c876e5ad7ab36f7770d3353f60673e0100b7c0c_ppc64le as a component of Red Hat Quay 3.12
  • registry.redhat.io/quay/quay-rhel8@sha256:8acebb6bd51def60517b03f92103cecfadfc8e7fce42e4a002cb9c9271915b6b_ppc64le as a component of Red Hat Quay 3.15
  • registry.redhat.io/quay/quay-rhel8@sha256:be166b843cc21b3942850443c0f802406f397f71959654a45e17a24fdcb0606a_s390x as a component of Red Hat Quay 3.15
  • registry.redhat.io/quay/quay-rhel8@sha256:c72dd9dd58db8ebcdc9b4daa433840411636e3dea82b21ca191fd0d272e636ec_amd64 as a component of Red Hat Quay 3.15
  • registry.redhat.io/quay/quay-rhel9@sha256:139cae64e4790ebf8b760c6376a33d15233222a25e4da39c6062d7e46c3a1bef_amd64 as a component of Red Hat Quay 3.16
  • registry.redhat.io/quay/quay-rhel9@sha256:52883f389182907dec0e286d626c4faea0f4ae29a5d0e841d6ad2287fdb964c2_arm64 as a component of Red Hat Quay 3.16
  • registry.redhat.io/quay/quay-rhel9@sha256:ad162e6ea2f6fd246f605180699ce36e4ea91c4b551c7af600a64e671a303ee9_s390x as a component of Red Hat Quay 3.16
Summary
A flaw was found in jsrsasign. An attacker can exploit an incomplete comparison vulnerability in the getRandomBigIntegerZeroToMax and getRandomBigIntegerMinToMax functions. By manipulating incorrect comparison checks, an attacker can bias the Digital Signature Algorithm (DSA) nonces during signature generation. This allows the attacker to recover the private key, leading to a critical security compromise.
Remediation
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://docs.redhat.com/en/documentation/migration_toolkit_for_virtualization/2.10/html-single/migrating_your_virtual_machines_to_red_hat_openshift_virtualization/index#assembly_upgrading-uninstalling-mtv_mtv
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2026-14373

No EUVD known-exploited evidence

Versions of the package jsrsasign from 7.0.0 and before 11.1.1 are vulnerable to Incomplete Comparison with Missing Factors via the getRandomBigIntegerZeroToMax and getRandomBigIntegerMinToMax functions in src/crypto-1.1.js; an attacker can recover the private key by exploiting the incorrect compareTo checks that accept out-of-range candidates and thus bias DSA nonces during signature generation.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
9.3 · CVSS 4.0
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 72 hours

Critical technical impact with a remotely reachable, unauthenticated path and a public exploit reference; no CISA KEV confirmation is currently recorded.

Patch available
01

What, why and how

Versions of the package jsrsasign from 7.0.0 and before 11.1.1 are vulnerable to Incomplete Comparison with Missing Factors via the getRandomBigIntegerZeroToMax and getRandomBigIntegerMinToMax functions in src/crypto-1.1.js; an attacker can recover the private key by exploiting the incorrect compareTo checks that accept out-of-range candidates and thus bias DSA nonces during signature generation.

What

Versions of the package jsrsasign from 7.0.0 and before 11.1.1 are vulnerable to Incomplete Comparison with Missing Factors via the getRandomBigIntegerZeroToMax and getRandomBigIntegerMinToMax functions in src/crypto-1.1.js; an attacker can recover the private key by exploiting the incorrect compareTo checks that accept out-of-range candidates and thus bias DSA nonces during signature generation.

Why

The product performs a comparison between entities that must consider multiple factors or characteristics of each entity, but the comparison does not include one or more of these factors.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

Versions of the package jsrsasign from 7.0.0 and before 11.1.1 are vulnerable to Incomplete Comparison with Missing Factors via the getRandomBigIntegerZeroToMax and getRandomBigIntegerMinToMax functions in src/crypto-1.1.js; an attacker can recover the private key by exploiting the incorrect compareTo checks that accept out-of-range candidates and thus bias DSA nonces during signature generation.

Why

The product performs a comparison between entities that must consider multiple factors or characteristics of each entity, but the comparison does not include one or more of these factors.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
Reference recorded

A structured CVE source labels at least one public reference as exploit material. BlackTree has not independently validated that it is safe, reliable or weaponised.

Likely attack path
a network path → Incomplete Comparison with Missing Factors → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Not a CVSS 4.0 base metric
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-1023 ↗

CWE-1023: Incomplete Comparison with Missing Factors. The product performs a comparison between entities that must consider multiple factors or characteristics of each entity, but the comparison does not include one or more of these factors.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Common Vulnerability Scoring System 4.0: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.ATNoneAttack requirements: No additional deployment or execution condition is required.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.VCHighVulnerable-system confidentiality: A successful attack can cause a major loss.VIHighVulnerable-system integrity: A successful attack can cause a major loss.VANoneVulnerable-system availability: No direct loss is represented by this metric.SCNoneSubsequent-system confidentiality: No direct loss is represented by this metric.SINoneSubsequent-system integrity: No direct loss is represented by this metric.SANoneSubsequent-system availability: No direct loss is represented by this metric.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkUnauthenticatedCWE-1023Public exploit reference
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2026-14373Official EUVD mapping

Versions of the package jsrsasign from 7.0.0 and before 11.1.1 are vulnerable to Incomplete Comparison with Missing Factors via the getRandomBigIntegerZeroToMax and getRandomBigIntegerMinToMax functions in src/crypto-1.1.js; an attacker can recover the private key by exploiting the incorrect compareTo checks that accept out-of-range candidates and thus bias DSA nonces during signature generation.

Official EUVD record
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
7.0.0 < 11.1.1; 8.0.12 < *
Fixed
registry.redhat.io/migration-toolkit-virtualization/mtv-console-plugin-rhel9@sha256:0b1a46357b43429aa2729b7caa728969a0d2cf306f56cbf3607acb78ac95b099_amd64 as a component of Migration Toolkit for Virtualization 2.1; registry.redhat.io/migration-toolkit-virtualization/mtv-console-plugin-rhel9@sha256:ac92e8f85699adfd5517fa9bbeb34833a4f9f9b0ccbfa3a55c0d9822976dadfc_amd64 as a component of Migration Toolkit for Virtualization 2.9; registry.redhat.io/quay/quay-rhel8@sha256:356815af5f87ce3a8e0ee8213bb9b5537b658f29338b51f63672c7e5d7a5a50b_amd64 as a component of Red Hat Quay 3.12; registry.redhat.io/quay/quay-rhel8@sha256:82a11b494b47a72a72edbbb595998ad0a00ade358acdffc58fb07217bdf9c67f_arm64 as a component of Red Hat Quay 3.12; registry.redhat.io/quay/quay-rhel8@sha256:c8bdf44dcdd96608b3dbb3c07bacbaa06d17e6e5333881559425edc53051f100_s390x as a component of Red Hat Quay 3.12; registry.redhat.io/quay/quay-rhel8@sha256:cd330fe833ad4ffa7fa3f2837c876e5ad7ab36f7770d3353f60673e0100b7c0c_ppc64le as a component of Red Hat Quay 3.12; registry.redhat.io/quay/quay-rhel8@sha256:8acebb6bd51def60517b03f92103cecfadfc8e7fce42e4a002cb9c9271915b6b_ppc64le as a component of Red Hat Quay 3.15; registry.redhat.io/quay/quay-rhel8@sha256:be166b843cc21b3942850443c0f802406f397f71959654a45e17a24fdcb0606a_s390x as a component of Red Hat Quay 3.15; registry.redhat.io/quay/quay-rhel8@sha256:c72dd9dd58db8ebcdc9b4daa433840411636e3dea82b21ca191fd0d272e636ec_amd64 as a component of Red Hat Quay 3.15; registry.redhat.io/quay/quay-rhel9@sha256:139cae64e4790ebf8b760c6376a33d15233222a25e4da39c6062d7e46c3a1bef_amd64 as a component of Red Hat Quay 3.16; registry.redhat.io/quay/quay-rhel9@sha256:52883f389182907dec0e286d626c4faea0f4ae29a5d0e841d6ad2287fdb964c2_arm64 as a component of Red Hat Quay 3.16; registry.redhat.io/quay/quay-rhel9@sha256:ad162e6ea2f6fd246f605180699ce36e4ea91c4b551c7af600a64e671a303ee9_s390x as a component of Red Hat Quay 3.16; registry.redhat.io/quay/quay-rhel9@sha256:f6a15c2f1b4d5900cdbd366080e40d3a90d51ba9e5b4d6196e15eefe69d902c3_ppc64le as a component of Red Hat Quay 3.16; registry.redhat.io/quay/quay-rhel8@sha256:a0b2026075e946fc046a6be46170a902051230d147061868209d559abd71981b_ppc64le as a component of Red Hat Quay 3.1; registry.redhat.io/quay/quay-rhel8@sha256:bb4c7f2f2f1d61d8bfcbf5a991d5faf417fb43ae189c3a008b367a3c2567121e_s390x as a component of Red Hat Quay 3.1; registry.redhat.io/quay/quay-rhel8@sha256:eae5ef47a0c9a80a074dd1e03d60ed54b2d53fe77753ba26cdc62f8d6d44f1f1_amd64 as a component of Red Hat Quay 3.1; registry.redhat.io/quay/quay-rhel8@sha256:08299d2ffb70a6b3f892ca732f97961a10a72cb4d4c123f10e81633f5c1c69ea_ppc64le as a component of Red Hat Quay 3.9; registry.redhat.io/quay/quay-rhel8@sha256:3f297a001a34b3e16d07d0a8d0b93ab2b09d4bc0e99f5e402a779138f67cea9f_s390x as a component of Red Hat Quay 3.9; registry.redhat.io/quay/quay-rhel8@sha256:a18b9479f4b10eaf07463b0da6660e106f2a924f92d576790187a6676930f5ed_amd64 as a component of Red Hat Quay 3.9
Action
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://docs.redhat.com/en/documentation/migration_toolkit_for_virtualization/2.10/html-single/migrating_your_virtual_machines_to_red_hat_openshift_virtualization/index#assembly_upgrading-uninstalling-mtv_mtv
Workaround
A mitigation or workaround reference is available from the source linked below; validate it against the affected product and version.
04

Evidence and provenance

Published 23 Mar 2026 · Last source change 7 Sept 2026, 12:04 UTC · CWE-1023 · Incomplete Comparison with Missing Factors

CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2026-14373
Product sourceCNA
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD modified after enrichment

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates →

No material field changes have been recorded since change tracking began. Routine source refreshes and cosmetic edits are intentionally excluded.

Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2026-14373↗Vendor CSAF · Red Hat Product Security↗Public exploit reference↗Patch or update reference↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2026-4599 · cve.blacktree.nl