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
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.7%CVSS: 9.8Exploit: None knownExposed services: Not assessed

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
9.8CRITICALmedium confidence
EG Risk
59
EG Risk 59/100

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
Severity98% × 45%
Exploitation1% × 40%
Automatability100% × 15%
EPSS PROB
0.7%
EPSS %ILE
53rd
KEV
Not listed

Published

June 8, 2026

Last Modified

July 23, 2026

Advisory Details (2)

Auto-updated Oct 3, 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
genericMentions a patch (unverified)🔴 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(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
redhatjbcs-httpd24-httpd2026-08-19redhat
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 6× 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 541 total refreshes for this CVE.

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

Related CVEs(same product + same vendor + same CWE)

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 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 0.7% probability of exploitation in the next 30 days (53rd percentile of EPSS-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?
A fix for CVE-2026-44631 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-44631 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-44631

Explore →

Is Your Infrastructure Affected by CVE-2026-44631?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs