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
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.2%CVSS: 7.5Exploit: None knownExposed services: Not assessed

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
7.5HIGHmedium 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
1.2%
EPSS %ILE
67th
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(13)

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

Patch Availability(12)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
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
redhatpatch2026-08-19redhat
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(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 4× in last 7d / 26× 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 322 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 19:49 UTCEPSS rescore
  4. 2026-09-30 15:03 UTCEPSS rescore
  5. 2026-09-28 13:51 UTCEPSS rescore
  6. 2026-09-27 13:48 UTCEPSS rescore
  7. 2026-09-26 15:58 UTCEPSS rescore
  8. 2026-09-26 00:26 UTCEPSS rescore
  9. 2026-09-20 20:15 UTCEPSS rescore
  10. 2026-09-18 19:28 UTCEPSS rescore
  11. 2026-09-18 19:28 UTCEPSS rescore
  12. 2026-09-17 19:30 UTCEPSS rescore
  13. 2026-09-16 14:08 UTCEPSS rescore
  14. 2026-09-16 05:15 UTCEPSS rescore
  15. 2026-09-15 03:11 UTCEPSS rescore
  16. 2026-09-14 04:53 UTCEG score recompute
  17. 2026-09-14 04:53 UTCVendor advisory
  18. 2026-09-14 04:53 UTCGHSA enrichment
  19. 2026-09-13 16:47 UTCEPSS rescore
  20. 2026-09-12 15:01 UTCEPSS rescore
  21. 2026-09-11 14:53 UTCEPSS rescore
  22. 2026-09-11 09:37 UTCEPSS rescore
  23. 2026-09-10 09:34 UTCEPSS rescore
  24. 2026-09-08 22:00 UTCEPSS rescore
  25. 2026-09-07 16:01 UTCEPSS rescore
Show 75 more
  1. 2026-09-06 13:47 UTCEPSS rescore
  2. 2026-09-04 05:06 UTCEPSS rescore
  3. 2026-09-02 14:12 UTCEPSS rescore
  4. 2026-09-01 13:53 UTCEPSS rescore
  5. 2026-09-01 04:39 UTCEPSS rescore
  6. 2026-08-31 02:13 UTCEG score recompute
  7. 2026-08-31 02:13 UTCVendor advisory
  8. 2026-08-31 02:13 UTCGHSA enrichment
  9. 2026-08-30 19:17 UTCEPSS rescore
  10. 2026-08-30 01:22 UTCEPSS rescore
  11. 2026-08-28 21:41 UTCEPSS rescore
  12. 2026-08-27 14:25 UTCEPSS rescore
  13. 2026-08-26 14:46 UTCEPSS rescore
  14. 2026-08-25 13:49 UTCEPSS rescore
  15. 2026-08-25 01:33 UTCEG score recompute
  16. 2026-08-25 01:33 UTCVendor advisory
  17. 2026-08-25 01:33 UTCGHSA enrichment
  18. 2026-08-24 00:11 UTCVendor advisory
  19. 2026-08-24 00:11 UTCGHSA enrichment
  20. 2026-08-23 11:52 UTCEG score recompute
  21. 2026-08-23 11:52 UTCVendor advisory
  22. 2026-08-23 11:52 UTCGHSA enrichment
  23. 2026-08-23 00:19 UTCEPSS rescore
  24. 2026-08-22 01:00 UTCEG score recompute
  25. 2026-08-22 01:00 UTCVendor advisory
  26. 2026-08-22 01:00 UTCGHSA enrichment
  27. 2026-08-21 23:49 UTCEPSS rescore
  28. 2026-08-21 12:43 UTCEG score recompute
  29. 2026-08-21 12:43 UTCVendor advisory
  30. 2026-08-21 12:43 UTCGHSA enrichment
  31. 2026-08-20 22:55 UTCEPSS rescore
  32. 2026-08-20 22:55 UTCEPSS rescore
  33. 2026-08-20 21:49 UTCVendor advisory
  34. 2026-08-20 21:49 UTCGHSA enrichment
  35. 2026-08-20 09:32 UTCEG score recompute
  36. 2026-08-20 09:32 UTCVendor advisory
  37. 2026-08-20 09:32 UTCGHSA enrichment
  38. 2026-08-19 17:03 UTCEPSS rescore
  39. 2026-08-18 13:48 UTCEPSS rescore
  40. 2026-08-17 14:58 UTCEG score recompute
  41. 2026-08-17 14:58 UTCVendor advisory
  42. 2026-08-17 14:57 UTCGHSA enrichment
  43. 2026-08-17 13:47 UTCEPSS rescore
  44. 2026-08-17 02:42 UTCEG score recompute
  45. 2026-08-17 02:42 UTCVendor advisory
  46. 2026-08-17 02:42 UTCGHSA enrichment
  47. 2026-08-16 14:56 UTCEPSS rescore
  48. 2026-08-16 14:26 UTCEG score recompute
  49. 2026-08-16 14:26 UTCVendor advisory
  50. 2026-08-16 14:26 UTCGHSA enrichment
  51. 2026-08-16 02:14 UTCEPSS rescore
  52. 2026-08-16 01:40 UTCVendor advisory
  53. 2026-08-16 01:40 UTCGHSA enrichment
  54. 2026-08-15 13:24 UTCEG score recompute
  55. 2026-08-15 13:24 UTCVendor advisory
  56. 2026-08-15 13:24 UTCGHSA enrichment
  57. 2026-08-15 01:30 UTCEPSS rescore
  58. 2026-08-15 01:08 UTCVendor advisory
  59. 2026-08-15 01:08 UTCGHSA enrichment
  60. 2026-08-14 12:53 UTCVendor advisory
  61. 2026-08-14 12:53 UTCGHSA enrichment
  62. 2026-08-14 00:37 UTCEG score recompute
  63. 2026-08-14 00:37 UTCVendor advisory
  64. 2026-08-14 00:37 UTCGHSA enrichment
  65. 2026-08-13 22:00 UTCEPSS rescore
  66. 2026-08-13 12:21 UTCVendor advisory
  67. 2026-08-13 12:21 UTCGHSA enrichment
  68. 2026-08-13 00:03 UTCEG score recompute
  69. 2026-08-13 00:03 UTCVendor advisory
  70. 2026-08-13 00:03 UTCGHSA enrichment
  71. 2026-08-12 13:50 UTCEPSS rescore
  72. 2026-08-12 11:48 UTCVendor advisory
  73. 2026-08-12 11:48 UTCGHSA enrichment
  74. 2026-08-11 23:32 UTCEG score recompute
  75. 2026-08-11 23:32 UTCVendor advisory

Related CVEs(same product + 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 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 1.2% probability of exploitation in the next 30 days (67th percentile of EPSS-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?
A fix for CVE-2026-34356 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-34356 are linked in the Vendor Advisories panel on this page.

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