CVE-2026-4599

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.48% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 39.0% of scored records. A rank, not a probability.

NVD base score

9.3 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

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/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

NVD analysis status

Modified. NVD last modified this record on 2026-08-17.

Red Hat severity

Important. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-03-23 05:00Z5 MO AGO

Last updated

2026-08-24 12:06Z11 DAYS AGO

Reserved

2026-03-22

Assigning CNA

snyk

Record state

PUBLISHED

Severity

Critical (CVSS 9.3)

CNA CVSS vector

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

Weaknesses

• CWE-1023Incomplete Comparison with Missing FactorsClass

Data version

5.2

Document digest

69ba08767a6002a361ee61d12c799743cfc5f2f70033e17a785f4ef37b368bce

• security.snyk.iohttps://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15370939
• security.snyk.iohttps://security.snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-15812264
• gist.github.comhttps://gist.github.com/Kr0emer/081681818b51605c91945126d74b4f20
• github.comhttps://github.com/kjur/jsrsasign/pull/647
• github.comhttps://github.com/kjur/jsrsasign/commit/ee4b013478366cb16cea9a4bdfb218b6077f83b1
• access.redhat.comhttps://access.redhat.com/security/cve/CVE-2026-4599vdb-entryx_refsource_REDHAT
• bugzilla.redhat.comRHBZ#2450207https://bugzilla.redhat.com/show_bug.cgi?id=2450207issue-trackingx_refsource_REDHAT
• security.access.redhat.comhttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4599.jsonx_sadp-csaf-vex
• access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:19409vendor-advisoryx_refsource_REDHAT
• access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:19410vendor-advisoryx_refsource_REDHAT
• access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:6720vendor-advisoryx_refsource_REDHAT
• access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:6568vendor-advisoryx_refsource_REDHAT
• access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:19375vendor-advisoryx_refsource_REDHAT
• access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:6912vendor-advisoryx_refsource_REDHAT
• access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:6926vendor-advisoryx_refsource_REDHAT