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 56% 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
Elevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.0%CVSS: 7.5Exploit: Elevated riskExposed services: Not assessed

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
7.5HIGHmedium confidence
EG Risk
65
EG Risk 65/100

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
Severity75% × 45%
Exploitation40% × 40%
Automatability100% × 15%
EPSS PROB
1.0%
EPSS %ILE
60th
KEV
Not listed

Published

March 23, 2026

Last Modified

September 10, 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 / EcosystemFix (by version range) / 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 rangeFix by version rangeDependents
jsrsasign—
  • every version 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 6× in last 7d / 27× 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 157 total refreshes for this CVE.

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

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

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 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-2026-4598 actively exploited?
CVE-2026-4598 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.0% probability of exploitation in the next 30 days (60th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-4598?
CVE-2026-4598 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-4598?
A fix for CVE-2026-4598 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-4598 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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