CVE-2026-4599

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5%, top 60% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.8%CVSS: 9.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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.

CVSS v3
9.1
EG Score
9.1CRITICALmedium confidence
EG Risk
56
EG Risk 56/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity91% × 45%
Exploitation0% × 40%
Automatability100% × 15%
EPSS PROB
0.8%
EPSS %ILE
54th
KEV
Not listed

Published

March 23, 2026

Last Modified

September 10, 2026

Advisory Details (10)

Auto-updated Sep 15, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: github_commit, github_pr, redhat.
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:6720
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:6568
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:19410
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:19409
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:19375
generic🔴 Active Exploitation

Incomplete Comparison with Missing Factors in jsrsasign | CVE-2026-4599 | Snyk

https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15370939
generic🔴 Active Exploitation

Incomplete Comparison with Missing Factors in org.webjars.npm:jsrsasign | CVE-2026-4599 | Snyk

https://security.snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-15812264
github_pr Patch Available

fix(crypto): correct compareTo checks in BigInteger RNG helpers

Patch available: kjur/jsrsasign 11.1.2 (PR #647 merged 2026-02-20)

https://github.com/kjur/jsrsasign/pull/647
github_commit Patch Available

commit ee4b01347836 (kjur/jsrsasign)

Patch available: kjur/jsrsasign 11.1.2 (contains commit ee4b01347836)

https://github.com/kjur/jsrsasign/commit/ee4b013478366cb16cea9a4bdfb218b6077f83b1
generic🟡 PoC Available

DSA Nonce Generation Enables Private Key Recovery.md · GitHub

https://gist.github.com/Kr0emer/081681818b51605c91945126d74b4f20

Vendor Advisories for CVE-2026-4599(8)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(7)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatquay/quay-rhel9:17792040862026-05-19redhat
redhatmigration-toolkit-virtualization/mtv-console-plugin-rhel9:17791398722026-05-19redhat
redhatmigration-toolkit-virtualization/mtv-console-plugin-rhel9:17789274622026-05-19redhat
redhatquay/quay-rhel8:17751691552026-04-07redhat
redhatquay/quay-rhel8:17751692182026-04-07redhat
redhatquay/quay-rhel8:17752530922026-04-06redhat
redhatquay/quay-rhel8:17751692192026-04-03redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFix by version rangeDependents
jsrsasign—
  • 7.0.0 up to 11.1.1: fixed in 11.1.1
—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 5× in last 7d / 25× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 162 total refreshes for this CVE.

  1. 2026-10-05 17:43 UTCEPSS rescore
  2. 2026-10-03 14:25 UTCEPSS rescore
  3. 2026-10-01 19:50 UTCEPSS rescore
  4. 2026-09-30 15:03 UTCEPSS rescore
  5. 2026-09-29 20:02 UTCOSV refresh
  6. 2026-09-28 13:51 UTCEPSS rescore
  7. 2026-09-27 13:48 UTCEPSS rescore
  8. 2026-09-26 15:59 UTCEPSS rescore
  9. 2026-09-26 00:27 UTCEPSS rescore
  10. 2026-09-23 17:53 UTCEPSS rescore
  11. 2026-09-18 19:28 UTCEPSS rescore
  12. 2026-09-16 14:08 UTCEPSS rescore
  13. 2026-09-16 05:15 UTCEPSS rescore
  14. 2026-09-13 16:47 UTCEPSS rescore
  15. 2026-09-11 14:53 UTCEPSS rescore
  16. 2026-09-10 13:41 UTCEG score recompute
  17. 2026-09-10 13:41 UTCVendor advisory
  18. 2026-09-10 12:28 UTCEG score recompute
  19. 2026-09-10 12:28 UTCVendor advisory
  20. 2026-09-10 09:35 UTCEPSS rescore
  21. 2026-09-08 22:01 UTCEPSS rescore
  22. 2026-09-07 16:01 UTCEPSS rescore
  23. 2026-09-07 14:01 UTCEG score recompute
  24. 2026-09-07 14:01 UTCVendor advisory
  25. 2026-09-06 13:47 UTCEPSS rescore
Show 75 more
  1. 2026-09-04 05:06 UTCEPSS rescore
  2. 2026-09-02 14:12 UTCEPSS rescore
  3. 2026-09-01 13:54 UTCEPSS rescore
  4. 2026-09-01 04:40 UTCEPSS rescore
  5. 2026-08-30 19:17 UTCEPSS rescore
  6. 2026-08-30 01:22 UTCEPSS rescore
  7. 2026-08-28 21:41 UTCEPSS rescore
  8. 2026-08-27 14:25 UTCEPSS rescore
  9. 2026-08-26 14:46 UTCEPSS rescore
  10. 2026-08-25 13:49 UTCEPSS rescore
  11. 2026-08-24 12:27 UTCEG score recompute
  12. 2026-08-24 12:27 UTCVendor advisory
  13. 2026-08-23 00:19 UTCEPSS rescore
  14. 2026-08-21 23:49 UTCEPSS rescore
  15. 2026-08-20 22:55 UTCEPSS rescore
  16. 2026-08-19 17:04 UTCEPSS rescore
  17. 2026-08-18 13:48 UTCEPSS rescore
  18. 2026-08-17 13:47 UTCEPSS rescore
  19. 2026-08-17 12:25 UTCEG score recompute
  20. 2026-08-17 12:25 UTCVendor advisory
  21. 2026-08-17 12:13 UTCEG score recompute
  22. 2026-08-17 12:13 UTCVendor advisory
  23. 2026-08-16 14:56 UTCEPSS rescore
  24. 2026-08-16 10:49 UTCEG score recompute
  25. 2026-08-16 10:49 UTCVendor advisory
  26. 2026-08-16 02:14 UTCEPSS rescore
  27. 2026-08-15 01:30 UTCEPSS rescore
  28. 2026-08-14 23:50 UTCVendor advisory
  29. 2026-08-14 19:46 UTCVendor advisory
  30. 2026-08-14 15:05 UTCVendor advisory
  31. 2026-08-14 11:02 UTCVendor advisory
  32. 2026-08-14 06:59 UTCEG score recompute
  33. 2026-08-14 06:59 UTCVendor advisory
  34. 2026-08-13 22:00 UTCEPSS rescore
  35. 2026-08-13 01:44 UTCVendor advisory
  36. 2026-08-12 21:41 UTCVendor advisory
  37. 2026-08-12 15:37 UTCEG score recompute
  38. 2026-08-12 15:37 UTCVendor advisory
  39. 2026-08-12 13:51 UTCEPSS rescore
  40. 2026-08-12 12:39 UTCEG score recompute
  41. 2026-08-12 12:39 UTCVendor advisory
  42. 2026-08-12 12:14 UTCVendor advisory
  43. 2026-08-12 01:19 UTCVendor advisory
  44. 2026-08-11 21:15 UTCEG score recompute
  45. 2026-08-11 21:15 UTCVendor advisory
  46. 2026-08-11 08:31 UTCVendor advisory
  47. 2026-08-11 04:18 UTCEG score recompute
  48. 2026-08-11 04:18 UTCVendor advisory
  49. 2026-08-11 00:00 UTCEPSS rescore
  50. 2026-08-10 15:45 UTCVendor advisory
  51. 2026-08-10 09:36 UTCVendor advisory
  52. 2026-08-10 05:33 UTCVendor advisory
  53. 2026-08-10 01:30 UTCVendor advisory
  54. 2026-08-09 21:26 UTCVendor advisory
  55. 2026-08-09 17:23 UTCEG score recompute
  56. 2026-08-09 17:23 UTCVendor advisory
  57. 2026-08-09 13:46 UTCEPSS rescore
  58. 2026-08-09 13:19 UTCVendor advisory
  59. 2026-08-09 06:35 UTCVendor advisory
  60. 2026-08-08 09:09 UTCVendor advisory
  61. 2026-08-08 05:06 UTCVendor advisory
  62. 2026-08-08 01:03 UTCVendor advisory
  63. 2026-08-07 21:00 UTCVendor advisory
  64. 2026-08-07 16:57 UTCEG score recompute
  65. 2026-08-07 16:57 UTCVendor advisory
  66. 2026-08-06 19:13 UTCEG score recompute
  67. 2026-08-06 19:13 UTCVendor advisory
  68. 2026-08-06 13:47 UTCEPSS rescore
  69. 2026-08-06 09:25 UTCVendor advisory
  70. 2026-08-06 05:21 UTCVendor advisory
  71. 2026-08-06 01:18 UTCEG score recompute
  72. 2026-08-06 01:18 UTCVendor advisory
  73. 2026-08-05 19:17 UTCEPSS rescore
  74. 2026-08-04 15:10 UTCEPSS rescore
  75. 2026-08-04 10:39 UTCEPSS rescore

Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-4599?
CVE-2026-4599 is a critical vulnerability published on March 23, 2026. 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…
When was CVE-2026-4599 disclosed?
CVE-2026-4599 was first published on March 23, 2026, with the most recent update on September 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-4599 actively exploited?
CVE-2026-4599 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.8% probability of exploitation in the next 30 days (54th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-4599?
CVE-2026-4599 has a CVSS base score of 9.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-4599?
A fix for CVE-2026-4599 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-4599 are linked in the Vendor Advisories panel on this page.

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