CVE-2026-42536

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-06-08. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — Patch released this week
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: None knownExposed: 0

A fix is available — apply it.

Heap-based Buffer Overflow vulnerability in Apache HTTP Server with mod_xml2enc, xml2StartParse, and untrusted content

This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67.

Users are recommended to upgrade to version 2.4.68, which fixes the issue.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: Track

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%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
58%
KEV
Not listed

Published

June 8, 2026

Last Modified

July 23, 2026

Advisory Details (1)

Auto-updated Jun 8, 2026
⚠️ Active exploitation confirmed. Patch available.
generic Patch Available🔴 Active Exploitation

Apache HTTP Server 2.4 vulnerabilities - The Apache HTTP Server Project

https://httpd.apache.org/security/vulnerabilities_24.html

Vendor Advisories for CVE-2026-42536(6)

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

Patch Availability(5)

Vendor / EcosystemFixed in / PatchReleasedSource
redhathttpd:2.4-8100020260714175253.489197e62026-07-21redhat
redhathttpd-0:2.4.62-13.el9_8.52026-07-20redhat
ubuntuapache2-utils (2.4.66-2ubuntu2.4) @ resolute2026-07-16ubuntu
redhathttpd-0:2.4.63-13.el10_2.42026-07-01redhat
redhathttpd-main-2.4.68-1.hum12026-06-10redhat

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.

Weakness Classification(2)

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

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 17× in last 7d / 83× 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 139 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-42536?
CVE-2026-42536 is a high vulnerability published on June 8, 2026. Heap-based Buffer Overflow vulnerability in Apache HTTP Server with mod_xml2enc, xml2StartParse, and untrusted content This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67. Users are recommended to upgrade to version 2.4.68, which fixes the issue.
When was CVE-2026-42536 disclosed?
CVE-2026-42536 was first published in the National Vulnerability Database on June 8, 2026, with the most recent update on July 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-42536 actively exploited?
CVE-2026-42536 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 42.1% of all scored CVEs.
What is the CVSS score of CVE-2026-42536?
CVE-2026-42536 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-42536?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42536, 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.

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