CVE-2026-34356

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH 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
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 7.5Exploit: NoneExposed: 0

A fix is available — apply it.

Heap-based Buffer Overflow vulnerability in Apache HTTP Server with malicious backend servers and ProxyPassReverseCookie*

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(high)
EPSS
48.0%
KEV
Not listed

Published

June 8, 2026

Last Modified

June 9, 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-2026-34356(2)

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 / EcosystemFixed in / PatchReleasedSource
redhathttpd-0:2.4.63-13.el10_2.42026-07-01redhat

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(1)

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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 32× in last 7d / 136× 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 136 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-34356?
CVE-2026-34356 is a high vulnerability published on June 8, 2026. Heap-based Buffer Overflow vulnerability in Apache HTTP Server with malicious backend servers and ProxyPassReverseCookie* 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-2026-34356 disclosed?
CVE-2026-34356 was first published in the National Vulnerability Database on June 8, 2026, with the most recent update on June 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-34356 actively exploited?
CVE-2026-34356 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 48.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-34356?
CVE-2026-34356 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-34356?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-34356, 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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