CVE-2026-34356

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 — 4 sources updated 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 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(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
51%
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-2026-34356(8)

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

Patch Availability(8)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuapache2-utils (2.4.66-2ubuntu2.4) @ resolute2026-08-20ubuntu
ubuntuapache2-utils (2.4.29-1ubuntu4.27+esm10) @ bionic2026-08-20ubuntu
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(1)

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 31× 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 267 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

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 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-2026-34356 actively exploited?
CVE-2026-34356 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 49.3% of all scored CVEs.
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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-34356

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