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
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: 2.7%CVSS: 7.5Exploit: Elevated riskExposed services: Not assessed

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
7.5HIGHmedium confidence
EG Risk
49
EG Risk 49/100

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%
Exploitation1% × 40%
Automatability100% × 15%
EPSS PROB
2.7%
EPSS %ILE
85th
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 / EcosystemFix (by version range) / 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 rangeFix by version rangeDependents
apache2—
  • every version up to 2.4.68-r0: fixed in 2.4.68-r0
—
Alpine:v3.22(1)
PackageVulnerable rangeFix by version rangeDependents
apache2—
  • every version up to 2.4.68-r0: fixed in 2.4.68-r0
—
Alpine:v3.23(1)
PackageVulnerable rangeFix by version rangeDependents
apache2—
  • every version up to 2.4.68-r0: fixed in 2.4.68-r0
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
apache2—
  • every version up to 2.4.68-r0: fixed in 2.4.68-r0
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
apache22.4.48-3.1 ... 2.4.67-1~deb11u2 (84 versions)
  • every version up to 2.4.67-1~deb11u3: fixed in 2.4.67-1~deb11u3
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
apache22.4.57-2 ... 2.4.67-2 (53 versions)
  • every version up to 2.4.68-1~deb12u1: fixed in 2.4.68-1~deb12u1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
apache22.4.65-2 ... 2.4.68-1~deb12u1 (27 versions)
  • every version up to 2.4.68-1~deb13u1: fixed in 2.4.68-1~deb13u1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
apache22.4.65-2 ... 2.4.68-1~deb13u1 (28 versions)
  • every version up to 2.4.68-1: fixed in 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 4× in last 7d / 32× 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 340 total refreshes for this CVE.

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

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 ↗

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

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 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 2.7% probability of exploitation in the next 30 days (85th percentile of EPSS-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?
A fix for CVE-2026-42536 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-42536 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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