CVE-2026-23918

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-05-04. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
8.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 46%CVSS: 8.8Exploit: NoneExposed: 0

A fix is available — apply it.

Double Free and possible RCE vulnerability in Apache HTTP Server with the HTTP/2 protocol.

This issue affects Apache HTTP Server: 2.4.66.

Users are recommended to upgrade to version 2.4.67, which fixes the issue.

CVSS v3
8.8
EG Score
8.8(medium)
EPSS
98.7%
KEV
Not listed

Published

May 4, 2026

Last Modified

June 30, 2026

Advisory Details (1)

Auto-updated May 4, 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-2026-23918(3)

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

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibapache2-mod-proxy-uwsgi (2.4.58-1ubuntu8.12) @ noble2026-06-15ubuntu
redhathttpd-main-2.4.67-0.1.hum12026-05-06redhat

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(2)

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

Additional Vendor Advisories

(1)

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 8× in last 7d / 53× 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 174 total refreshes for this CVE.

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

Publicly available exploits

(6 references)

Working exploit code is in the public domain (5 GitHub PoCs) (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-52577
    First seen May 26, 2026

    Apache HTTP Server 2.4.66 - 'mod_http2' Double-Free Denial of Service

    Open source ↗
  • GitHub PoCstriga-ai/CVE-2026-23918
    First seen May 11, 2026

    Double-free in Apache httpd mod_http2 stream cleanup leading to pre-auth RCE.

    Open source ↗
  • GitHub PoCxeloxa/CVE-2026-23918-Apache-H2-PoC
    First seen May 6, 2026

    Proof-of-Concept exploit for CVE-2026-23918 (Apache mod_http2 double-free). Features multi-mode DoS (Rapid-RST, Slow-Drip) and passive RCE/vulnerability detection for Apache 2.4.66.

    Open source ↗
  • GitHub PoCrhasan-com/CVE-2026-23918
    First seen May 6, 2026

    Apache HTTP/2 double-free vulnerability PoC (CVE-2026-23918)

    Open source ↗
  • GitHub PoCqassam-315/CVE-2026-23918-Elite-Auditor
    First seen May 5, 2026

    Elite reconnaissance script for auditing Apache's HTTP/2 stack against memory corruption (CVE-2026-23918). Features ALPN protocol forcing and monochrome dashboard intelligence. Built for Blue Teams and Security Researchers.

    Open source ↗
  • GitHub PoC12lie20/CVE-2026-23918-test
    First seen May 5, 2026

    This repository contains a Proof of Concept (PoC) demonstrating the Double Free vulnerability (CVE-2026-23918) in Apache HTTP Server 2.4.66 `mod_http2`.

    Open source ↗

Frequently asked(5)

What is CVE-2026-23918?
CVE-2026-23918 is a high vulnerability published on May 4, 2026. Double Free and possible RCE vulnerability in Apache HTTP Server with the HTTP/2 protocol. This issue affects Apache HTTP Server: 2.4.66. Users are recommended to upgrade to version 2.4.67, which fixes the issue.
When was CVE-2026-23918 disclosed?
CVE-2026-23918 was first published in the National Vulnerability Database on May 4, 2026, with the most recent update on June 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-23918 actively exploited?
CVE-2026-23918 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 98.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-23918?
CVE-2026-23918 has a CVSS v3.1 base score of 8.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-23918?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-23918, 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

Explore the affected products and dependency analysis for CVE-2026-23918

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