CVE-2026-4598

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5%, top 57% 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
Trending — 4 sources updated this weekElevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.5Exploit: Elevated riskExposed: 0

A fix is available — apply it.

Versions of the package jsrsasign before 11.1.1 are vulnerable to Infinite loop via the bnModInverse function in ext/jsbn2.js when the BigInteger.modInverse implementation receives zero or negative inputs, allowing an attacker to hang the process permanently by supplying such crafted values (e.g., modInverse(0, m) or modInverse(-1, m)).

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
65(Attend)
EG Risk 65/100SSVC: Attend

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
Severity75% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
1%
EPSS %ILE
44%
KEV
Not listed

Published

March 23, 2026

Last Modified

August 17, 2026

Advisory Details (4)

Auto-updated Jun 22, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: github_commit, github_pr.
generic🔴 Active Exploitation

Infinite loop in jsrsasign | CVE-2026-4598 | Snyk

https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15370938
github_pr Patch Available

fix(jsbn2): prevent modInverse hangs on zero and negative inputs

Patch available: kjur/jsrsasign 11.1.2 (PR #648 merged 2026-02-20)

https://github.com/kjur/jsrsasign/pull/648
github_commit Patch Available

commit ca5b02724028 (kjur/jsrsasign)

Patch available: kjur/jsrsasign 11.1.2 (contains commit ca5b02724028)

https://github.com/kjur/jsrsasign/commit/ca5b027240287a1e71fe63019fc4400332594323
generic

jsrsasign_modinverse_dos.md · GitHub

https://gist.github.com/Kr0emer/a1bf5cd4547cc630d2dcc5e761de8264

Vendor Advisories for CVE-2026-4598(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 / EcosystemFixed in / PatchReleasedSource
redhatquay/quay-rhel8:17798114732026-06-04redhat
redhatquay/quay-rhel8:17798222612026-06-03redhat
redhatmigration-toolkit-virtualization/mtv-console-plugin-rhel9:17791398722026-05-19redhat
redhatmigration-toolkit-virtualization/mtv-console-plugin-rhel9:17789274622026-05-19redhat
redhatquay/quay-rhel9:17792040862026-05-19redhat
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 rangeFixed inDependents
jsrsasign—11.1.1—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 15× in last 7d / 71× 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 117 total refreshes for this CVE.

  1. 2026-08-20 22:55 UTCEPSS rescore
  2. 2026-08-19 17:04 UTCEPSS rescore
  3. 2026-08-18 13:48 UTCEPSS rescore
  4. 2026-08-17 13:47 UTCEPSS rescore
  5. 2026-08-17 12:25 UTCEG score recompute
  6. 2026-08-17 12:25 UTCVendor advisory
  7. 2026-08-17 12:25 UTCNVD updateCVSS v4 → 7.7
  8. 2026-08-17 12:13 UTCEG score recompute
  9. 2026-08-17 12:13 UTCVendor advisory
  10. 2026-08-16 14:56 UTCEPSS rescore
  11. 2026-08-16 10:49 UTCEG score recompute
  12. 2026-08-16 10:49 UTCVendor advisory
  13. 2026-08-16 02:14 UTCEPSS rescore
  14. 2026-08-15 01:30 UTCEPSS rescore
  15. 2026-08-14 19:46 UTCVendor advisory
  16. 2026-08-14 06:59 UTCEG score recompute
  17. 2026-08-14 06:59 UTCVendor advisory
  18. 2026-08-13 22:00 UTCEPSS rescore
  19. 2026-08-13 15:35 UTCEG score recompute
  20. 2026-08-13 15:35 UTCVendor advisory
  21. 2026-08-13 15:31 UTCMITRE cvelistV5CVSS v4 → 8.7
  22. 2026-08-13 01:15 UTCEG score recompute
  23. 2026-08-13 01:15 UTCVendor advisory
  24. 2026-08-12 13:51 UTCEPSS rescore
  25. 2026-08-12 12:39 UTCEG score recompute
Show 75 more
  1. 2026-08-12 12:39 UTCVendor advisory
  2. 2026-08-12 12:36 UTCNVD updateCVSS v4 → 7.7
  3. 2026-08-12 12:14 UTCVendor advisory
  4. 2026-08-11 21:15 UTCEG score recompute
  5. 2026-08-11 21:15 UTCVendor advisory
  6. 2026-08-11 04:18 UTCEG score recompute
  7. 2026-08-11 04:18 UTCVendor advisory
  8. 2026-08-11 00:00 UTCEPSS rescore
  9. 2026-08-10 12:27 UTCVendor advisory
  10. 2026-08-10 07:46 UTCVendor advisory
  11. 2026-08-09 19:11 UTCEG score recompute
  12. 2026-08-09 19:11 UTCVendor advisory
  13. 2026-08-09 13:46 UTCEPSS rescore
  14. 2026-08-09 06:35 UTCEG score recompute
  15. 2026-08-09 06:35 UTCVendor advisory
  16. 2026-08-08 16:37 UTCEPSS rescore
  17. 2026-08-08 05:33 UTCVendor advisory
  18. 2026-08-07 16:57 UTCEG score recompute
  19. 2026-08-07 16:57 UTCVendor advisory
  20. 2026-08-06 19:13 UTCEG score recompute
  21. 2026-08-06 19:13 UTCVendor advisory
  22. 2026-08-06 13:47 UTCEPSS rescore
  23. 2026-08-06 01:18 UTCEG score recompute
  24. 2026-08-06 01:18 UTCVendor advisory
  25. 2026-08-05 19:17 UTCEPSS rescore
  26. 2026-08-04 15:10 UTCEPSS rescore
  27. 2026-08-04 10:39 UTCEPSS rescore
  28. 2026-08-04 01:25 UTCVendor advisory
  29. 2026-08-03 12:49 UTCEG score recompute
  30. 2026-08-03 12:49 UTCVendor advisory
  31. 2026-08-03 10:36 UTCEPSS rescore
  32. 2026-08-02 15:38 UTCEG score recompute
  33. 2026-08-02 15:38 UTCVendor advisory
  34. 2026-08-02 02:27 UTCEPSS rescore
  35. 2026-08-01 04:16 UTCEPSS rescore
  36. 2026-07-30 16:28 UTCEPSS rescore
  37. 2026-07-30 01:30 UTCEPSS rescore
  38. 2026-07-28 15:37 UTCEPSS rescore
  39. 2026-07-27 12:41 UTCEG score recompute
  40. 2026-07-27 12:41 UTCVendor advisory
  41. 2026-07-27 12:37 UTCMITRE cvelistV5CVSS v4 → 8.7
  42. 2026-07-26 14:54 UTCEPSS rescore
  43. 2026-07-25 14:18 UTCEPSS rescore
  44. 2026-07-24 14:18 UTCEPSS rescore
  45. 2026-07-23 14:18 UTCEPSS rescore
  46. 2026-07-23 03:16 UTCEG score recompute
  47. 2026-07-22 14:08 UTCEPSS rescore
  48. 2026-07-21 15:25 UTCEPSS rescore
  49. 2026-07-20 17:08 UTCEPSS rescore
  50. 2026-07-20 12:36 UTCNVD updateCVSS v4 → 7.7
  51. 2026-07-20 12:17 UTCMITRE cvelistV5CVSS v4 → 8.7
  52. 2026-07-19 14:31 UTCEPSS rescore
  53. 2026-07-19 14:31 UTCEPSS rescore
  54. 2026-07-19 02:29 UTCEPSS rescore
  55. 2026-07-18 10:04 UTCEPSS rescore
  56. 2026-07-16 17:03 UTCEPSS rescore
  57. 2026-07-15 16:57 UTCEPSS rescore
  58. 2026-07-15 16:57 UTCEPSS rescore
  59. 2026-07-15 04:20 UTCNVD updateCVSS v4 → 7.7
  60. 2026-07-15 02:00 UTCEPSS rescore
  61. 2026-07-15 02:00 UTCEPSS rescore
  62. 2026-07-13 22:31 UTCEPSS rescore
  63. 2026-07-13 06:13 UTCEPSS rescore
  64. 2026-07-13 06:13 UTCEPSS rescore
  65. 2026-07-12 05:46 UTCEPSS rescore
  66. 2026-07-11 08:27 UTCEPSS rescore
  67. 2026-07-10 19:41 UTCOSV refresh
  68. 2026-07-09 19:10 UTCEPSS rescore
  69. 2026-07-08 15:16 UTCEPSS rescore
  70. 2026-07-07 15:51 UTCMITRE cvelistV5CVSS v4 → 8.7
  71. 2026-07-07 13:46 UTCEPSS rescore
  72. 2026-07-06 16:27 UTCEPSS rescore
  73. 2026-07-06 02:23 UTCEPSS rescore
  74. 2026-07-05 02:30 UTCEPSS rescore
  75. 2026-07-04 06:31 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-4598?
CVE-2026-4598 is a high vulnerability published on March 23, 2026. Versions of the package jsrsasign before 11.1.1 are vulnerable to Infinite loop via the bnModInverse function in ext/jsbn2.js when the BigInteger.modInverse implementation receives zero or negative inputs, allowing an attacker to hang the process permanently by supplying such crafted values (e.g.,…
When was CVE-2026-4598 disclosed?
CVE-2026-4598 was first published in the National Vulnerability Database on March 23, 2026, with the most recent update on August 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-4598 actively exploited?
CVE-2026-4598 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 56.5% of all scored CVEs.
What is the CVSS score of CVE-2026-4598?
CVE-2026-4598 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-4598?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-4598, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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