CVE-2026-59887

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: 0.6% (48th percentile of EPSS-scored CVEs). 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: 0.6%CVSS: 7.5Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

linkify-it is a links recognition library with full Unicode support. Prior to 5.0.2, the mailto: schema validator used by .test() and .match() can be invoked at every mailto: occurrence and scan the remaining input through src_email_name in lib/re.mjs, causing O(n^2) CPU consumption on crafted user text. This issue is fixed in version 5.0.2.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
65
EG Risk 65/100CISA SSVC

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%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.6%
EPSS %ILE
49th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

July 8, 2026

Last Modified

August 26, 2026

Advisory Details (2)

Auto-updated Jul 8, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github.
githubMentions a patch (unverified)🟡 PoC Available

Quadratic-complexity DoS via the `mailto:` validator scan-loop on attacker text · Advisory · markdown-it/linkify-it · GitHub

https://github.com/markdown-it/linkify-it/security/advisories/GHSA-v245-v573-v5vm
github_commit

commit 105e5d77f7d1 (markdown-it/linkify-it)

Fix landed in markdown-it/linkify-it commit 105e5d77f7d1 — awaiting tagged release

https://github.com/markdown-it/linkify-it/commit/105e5d77f7d119871d2b2d86ed208568eb3e7ffe

Vendor Advisories for CVE-2026-59887(3)

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

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatdevspaces/pluginregistry-rhel9:17888831792026-09-17redhat

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
linkify-it—
  • every version up to 5.0.2: fixed in 5.0.2
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 36× 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 143 total refreshes for this CVE.

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

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Same product

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npm:linkify-it

Frequently asked(5)

What is CVE-2026-59887?
CVE-2026-59887 is a high vulnerability published on July 8, 2026. linkify-it is a links recognition library with full Unicode support. Prior to 5.0.2, the mailto: schema validator used by .test() and .match() can be invoked at every mailto: occurrence and scan the remaining input through srcemailname in lib/re.mjs, causing O(n^2) CPU consumption on crafted user…
When was CVE-2026-59887 disclosed?
CVE-2026-59887 was first published on July 8, 2026, with the most recent update on August 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-59887 actively exploited?
CVE-2026-59887 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (49th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-59887?
CVE-2026-59887 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-2026-59887?
A fix for CVE-2026-59887 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-59887 are linked in the Vendor Advisories panel on this page.

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