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 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.

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
62%
KEV
Not listed

Published

June 8, 2026

Last Modified

September 14, 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(13)

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

Patch Availability(13)

Vendor / EcosystemFixed in / PatchReleasedSource
redhathttpd-0:2.4.53-11.el9_2.152026-09-14redhat
ubuntuapache2-utils (2.4.66-2ubuntu2.4) @ resolute2026-09-14ubuntu
ubuntuapache2-utils (2.4.18-2ubuntu3.17+esm19) @ xenial2026-09-14ubuntu
redhathttpd-0:2.4.57-11.el9_4.52026-09-10redhat
redhathttpd-0:2.4.62-4.el9_6.62026-09-01redhat
redhatjbcs-httpd24-httpd2026-08-19redhat
redhatjbcs-httpd24-mod_security-0:2.9.6-19.el8jbcs2026-08-19redhat
redhatinsights-proxy/insights-proxy-container-rhel9:17864336562026-08-11redhat
redhathttpd-0:2.4.63-1.el10_0.42026-07-28redhat
redhathttpd:2.4-8100020260714175253.489197e62026-07-21redhat
redhathttpd-0:2.4.62-13.el9_8.52026-07-20redhat
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.

Affected Packages

(8 across 8 ecosystems)
Alpine:v3.21(1)
PackageVulnerable rangeFixed inDependents
apache2—2.4.68-r0—
Alpine:v3.22(1)
PackageVulnerable rangeFixed inDependents
apache2—2.4.68-r0—
Alpine:v3.23(1)
PackageVulnerable rangeFixed inDependents
apache2—2.4.68-r0—
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
apache2—2.4.68-r0—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
apache22.4.48-3.1 ... 2.4.67-1~deb11u2 (84 versions)2.4.67-1~deb11u3—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
apache22.4.57-2 ... 2.4.67-2 (53 versions)2.4.68-1~deb12u1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
apache22.4.65-2 ... 2.4.68-1~deb12u1 (27 versions)2.4.68-1~deb13u1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
apache22.4.65-2 ... 2.4.68-1~deb13u1 (28 versions)2.4.68-1—

Weakness Classification(2)

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

Additional Vendor Advisories

(2)

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 13× in last 7d / 68× 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 332 total refreshes for this CVE.

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

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCerberkan/CVE-2026-42536-PoC
    First seen Sep 13, 2026

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

    Open source ↗

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 September 14, 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 38.0% 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.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-42536

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