CVE-2026-4602

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 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
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: 0%CVSS: 7.5Exploit: Elevated riskExposed: 0

A fix is available — apply it.

Versions of the package jsrsasign before 11.1.1 are vulnerable to Incorrect Conversion between Numeric Types due to handling negative exponents in ext/jsbn2.js. An attacker can force the computation of incorrect modular inverses and break signature verification by calling modPow with a negative exponent.

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
0%
EPSS %ILE
40%
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

Incorrect Conversion between Numeric Types in jsrsasign | CVE-2026-4602 | Snyk

https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15371175
github_pr Patch Available

fix(jsbn2): handle negative exponents in BigInteger.modPow

Patch available: kjur/jsrsasign 11.1.2 (PR #650 merged 2026-02-20)

https://github.com/kjur/jsrsasign/pull/650
github_commit Patch Available

commit 5ea1c32bb2aa (kjur/jsrsasign)

Patch available: kjur/jsrsasign 11.1.2 (contains commit 5ea1c32bb2aa)

https://github.com/kjur/jsrsasign/commit/5ea1c32bb2aa894b4bd29849839afe4f98728195
generic🟡 PoC Available

jsrsasign_on_negative_exponent.md · GitHub

https://gist.github.com/Kr0emer/7ecd2be7d17419e4677315ef3758faf5

Vendor Advisories for CVE-2026-4602(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-rhel9:17792040862026-05-19redhat
redhatmigration-toolkit-virtualization/mtv-console-plugin-rhel9:17789274622026-05-19redhat
redhatmigration-toolkit-virtualization/mtv-console-plugin-rhel9:17791398722026-05-19redhat
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 rangeFixed inDependents
jsrsasign—11.1.1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 14× in last 7d / 70× 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 116 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 15:39 UTCEG score recompute
  16. 2026-08-14 15:39 UTCVendor advisory
  17. 2026-08-14 15:38 UTCMITRE cvelistV5CVSS v4 → 8.7
  18. 2026-08-14 06:59 UTCEG score recompute
  19. 2026-08-14 06:59 UTCVendor advisory
  20. 2026-08-13 22:00 UTCEPSS rescore
  21. 2026-08-13 01:27 UTCEG score recompute
  22. 2026-08-13 01:27 UTCVendor advisory
  23. 2026-08-12 13:51 UTCEPSS rescore
  24. 2026-08-12 12:39 UTCEG score recompute
  25. 2026-08-12 12:39 UTCVendor advisory
Show 75 more
  1. 2026-08-12 12:36 UTCNVD updateCVSS v4 → 7.7
  2. 2026-08-12 12:14 UTCVendor advisory
  3. 2026-08-11 21:15 UTCEG score recompute
  4. 2026-08-11 21:15 UTCVendor advisory
  5. 2026-08-11 04:18 UTCEG score recompute
  6. 2026-08-11 04:18 UTCVendor advisory
  7. 2026-08-11 00:00 UTCEPSS rescore
  8. 2026-08-10 04:26 UTCVendor advisory
  9. 2026-08-09 15:36 UTCEG score recompute
  10. 2026-08-09 15:36 UTCVendor advisory
  11. 2026-08-09 13:46 UTCEPSS rescore
  12. 2026-08-09 06:35 UTCVendor advisory
  13. 2026-08-08 15:32 UTCVendor advisory
  14. 2026-08-08 05:45 UTCVendor advisory
  15. 2026-08-07 16:57 UTCEG score recompute
  16. 2026-08-07 16:57 UTCVendor advisory
  17. 2026-08-06 19:13 UTCEG score recompute
  18. 2026-08-06 19:13 UTCVendor advisory
  19. 2026-08-06 13:47 UTCEPSS rescore
  20. 2026-08-06 01:18 UTCEG score recompute
  21. 2026-08-06 01:18 UTCVendor advisory
  22. 2026-08-05 19:17 UTCEPSS rescore
  23. 2026-08-04 15:10 UTCEPSS rescore
  24. 2026-08-04 10:39 UTCEPSS rescore
  25. 2026-08-04 01:38 UTCVendor advisory
  26. 2026-08-03 12:49 UTCEG score recompute
  27. 2026-08-03 12:49 UTCVendor advisory
  28. 2026-08-03 10:36 UTCEPSS rescore
  29. 2026-08-02 15:56 UTCEG score recompute
  30. 2026-08-02 15:56 UTCVendor advisory
  31. 2026-08-02 02:27 UTCEPSS rescore
  32. 2026-08-01 04:16 UTCEPSS rescore
  33. 2026-07-30 16:28 UTCEPSS rescore
  34. 2026-07-30 01:30 UTCEPSS rescore
  35. 2026-07-29 15:34 UTCEG score recompute
  36. 2026-07-29 15:34 UTCVendor advisory
  37. 2026-07-28 15:37 UTCEPSS rescore
  38. 2026-07-26 15:44 UTCEG score recompute
  39. 2026-07-26 15:44 UTCVendor advisory
  40. 2026-07-26 15:44 UTCMITRE cvelistV5CVSS v4 → 8.7
  41. 2026-07-26 14:54 UTCEPSS rescore
  42. 2026-07-25 14:18 UTCEPSS rescore
  43. 2026-07-24 14:18 UTCEPSS rescore
  44. 2026-07-23 14:18 UTCEPSS rescore
  45. 2026-07-23 03:16 UTCEG score recompute
  46. 2026-07-22 14:08 UTCEPSS rescore
  47. 2026-07-21 15:25 UTCEPSS rescore
  48. 2026-07-20 17:08 UTCEPSS rescore
  49. 2026-07-20 12:36 UTCNVD updateCVSS v4 → 7.7
  50. 2026-07-19 14:31 UTCEPSS rescore
  51. 2026-07-19 14:31 UTCEPSS rescore
  52. 2026-07-19 02:29 UTCEPSS rescore
  53. 2026-07-18 10:04 UTCEPSS rescore
  54. 2026-07-16 17:03 UTCEPSS rescore
  55. 2026-07-16 15:53 UTCMITRE cvelistV5CVSS v4 → 8.7
  56. 2026-07-15 16:57 UTCEPSS rescore
  57. 2026-07-15 16:57 UTCEPSS rescore
  58. 2026-07-15 04:20 UTCNVD updateCVSS v4 → 7.7
  59. 2026-07-15 02:00 UTCEPSS rescore
  60. 2026-07-15 02:00 UTCEPSS rescore
  61. 2026-07-13 22:31 UTCEPSS rescore
  62. 2026-07-13 06:13 UTCEPSS rescore
  63. 2026-07-13 06:13 UTCEPSS rescore
  64. 2026-07-12 05:46 UTCEPSS rescore
  65. 2026-07-11 08:27 UTCEPSS rescore
  66. 2026-07-10 19:41 UTCOSV refresh
  67. 2026-07-09 19:10 UTCEPSS rescore
  68. 2026-07-08 15:16 UTCEPSS rescore
  69. 2026-07-07 13:46 UTCEPSS rescore
  70. 2026-07-06 16:27 UTCEPSS rescore
  71. 2026-07-06 15:36 UTCMITRE cvelistV5CVSS v4 → 8.7
  72. 2026-07-06 02:23 UTCEPSS rescore
  73. 2026-07-05 02:30 UTCEPSS rescore
  74. 2026-07-04 06:31 UTCEPSS rescore
  75. 2026-07-01 15:07 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-4602?
CVE-2026-4602 is a high vulnerability published on March 23, 2026. Versions of the package jsrsasign before 11.1.1 are vulnerable to Incorrect Conversion between Numeric Types due to handling negative exponents in ext/jsbn2.js. An attacker can force the computation of incorrect modular inverses and break signature verification by calling modPow with a negative…
When was CVE-2026-4602 disclosed?
CVE-2026-4602 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-2026-4602 actively exploited?
CVE-2026-4602 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 59.8% of all scored CVEs.
What is the CVSS score of CVE-2026-4602?
CVE-2026-4602 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-4602?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-4602, 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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