CVE-2026-44631

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-06-08. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — Patch released this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: None knownExposed: 0

A fix is available — apply it.

Buffer Underwrite vulnerability in Apache HTTP Server on crafted regular expressions in the configuration.

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
9.8
EG Score
9.8(medium)
EG Risk
59(Track)
EG Risk 59/100SSVC: 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
Severity98% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
40%
KEV
Not listed

Published

June 8, 2026

Last Modified

July 23, 2026

Advisory Details (2)

Auto-updated Jul 25, 2026
⚠️ Active exploitation confirmed. Patch available.
generic

oss-security - CVE-2026-44631: Apache HTTP Server: Heap Underflow in `ap_regname` via Signed Char Overflow

http://www.openwall.com/lists/oss-security/2026/06/08/14
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-2026-44631(6)

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

Patch Availability(6)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuapache2-utils (2.4.66-2ubuntu2.4) @ resolute2026-07-26ubuntu
ubuntuapache2-utils (2.4.18-2ubuntu3.17+esm19) @ xenial2026-07-26ubuntu
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.

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 21× in last 7d / 138× 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 244 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-44631?
CVE-2026-44631 is a critical vulnerability published on June 8, 2026. Buffer Underwrite vulnerability in Apache HTTP Server on crafted regular expressions in the configuration. 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-2026-44631 disclosed?
CVE-2026-44631 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-2026-44631 actively exploited?
CVE-2026-44631 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 59.8% of all scored CVEs.
What is the CVSS score of CVE-2026-44631?
CVE-2026-44631 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-44631?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-44631, 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.

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