CVE-2026-44631

CRITICALPre-NVD 9.89.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

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 (Vulnrichment) CVSS v3.1, EPSS, GitHub Security Advisory
Trending — 4 sources updated this week

Also known asEUVD-2026-35095 (ENISA EUVD) · GHSA-9jv8-9586-5r34 (GitHub Security Advisories)Source: ENISA EUVD

9.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%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 impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity98% × 45%
Impact severity (EG Severity): CVSS 9.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.5% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.5%
EPSS %ILE
43rd
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (9.8): severity, escalated by confirmed exploitation. This CVE's 9.8 is its impact severity (EG Severity), not escalated.

EG Severity
9.8 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.5% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-01). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 3 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)3 days if the affected system is publicly exposed; 60 days if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

June 8, 2026

Last Modified

July 23, 2026

Advisory Details (2)

Auto-updated Oct 31, 2026
Patch available.
Web page

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
Web pageMentions a patch (unverified)

Apache HTTP Server 2.4 vulnerabilities - The Apache HTTP Server Project

https://httpd.apache.org/security/vulnerabilities_24.html

Patch Availability(13)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntuapache2-utils (2.4.18-2ubuntu3.17+esm19) @ xenial2026-11-02ubuntu
ubuntulibapache2-mod-proxy-uwsgi (2.4.52-1ubuntu4.23) @ jammy2026-11-02ubuntu
redhathttpd-0:2.4.53-11.el9_2.152026-09-14redhat
redhathttpd-0:2.4.57-11.el9_4.52026-09-10redhat
redhathttpd-0:2.4.62-4.el9_6.62026-09-01redhat
redhatjbcs-httpd24-httpd-0:2.4.62-16.el8jbcs2026-08-19redhat
redhatjbcs-httpd24-httpd2026-08-19redhat
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 30× in last 7d / 101× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 636 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 536 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-02 08:00 UTCEG score recompute
  2. 2026-11-02 08:00 UTCVendor advisory
  3. 2026-11-02 08:00 UTCGHSA enrichmentGHSA-9jv8-9586-5r34 · GitHub severity CRITICAL · GitHub CVSS 9.8
  4. 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  5. 2026-11-01 09:47 UTCEG score recompute
  6. 2026-11-01 09:47 UTCVendor advisory
  7. 2026-11-01 09:46 UTCGHSA enrichmentGHSA-9jv8-9586-5r34 · GitHub severity CRITICAL · GitHub CVSS 9.8
  8. 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  9. 2026-10-31 11:32 UTCEG score recompute
  10. 2026-10-31 11:32 UTCVendor advisory
  11. 2026-10-31 11:32 UTCGHSA enrichmentGHSA-9jv8-9586-5r34 · GitHub severity CRITICAL · GitHub CVSS 9.8
  12. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  13. 2026-10-30 13:19 UTCEG score recompute
  14. 2026-10-30 13:19 UTCVendor advisory
  15. 2026-10-30 13:18 UTCGHSA enrichmentGHSA-9jv8-9586-5r34 · GitHub severity CRITICAL · GitHub CVSS 9.8
  16. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  17. 2026-10-29 15:05 UTCVendor advisory
  18. 2026-10-29 15:04 UTCGHSA enrichmentGHSA-9jv8-9586-5r34 · GitHub severity CRITICAL · GitHub CVSS 9.8
  19. 2026-10-28 16:51 UTCEG score recompute
  20. 2026-10-28 16:51 UTCVendor advisory
  21. 2026-10-28 16:51 UTCGHSA enrichmentGHSA-9jv8-9586-5r34 · GitHub severity CRITICAL · GitHub CVSS 9.8
  22. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  23. 2026-10-27 18:31 UTCEG score recompute
  24. 2026-10-27 18:31 UTCVendor advisory
  25. 2026-10-27 18:31 UTCGHSA enrichmentGHSA-9jv8-9586-5r34 · GitHub severity CRITICAL · GitHub CVSS 9.8
Show 75 more
  1. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  2. 2026-10-26 20:18 UTCEG score recompute
  3. 2026-10-26 20:18 UTCVendor advisory
  4. 2026-10-26 20:18 UTCGHSA enrichmentGHSA-9jv8-9586-5r34 · GitHub severity CRITICAL · GitHub CVSS 9.8
  5. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  6. 2026-10-25 20:13 UTCEG score recompute
  7. 2026-10-25 20:13 UTCVendor advisory
  8. 2026-10-25 20:13 UTCGHSA enrichmentGHSA-9jv8-9586-5r34 · GitHub severity CRITICAL · GitHub CVSS 9.8
  9. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  10. 2026-10-25 14:27 UTCEG score recompute
  11. 2026-10-24 21:59 UTCEG score recompute
  12. 2026-10-24 21:59 UTCVendor advisory
  13. 2026-10-24 21:58 UTCGHSA enrichmentGHSA-9jv8-9586-5r34 · GitHub severity CRITICAL · GitHub CVSS 9.8
  14. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.7% · 54th percentile
  15. 2026-10-23 23:45 UTCEG score recompute
  16. 2026-10-23 23:45 UTCVendor advisory
  17. 2026-10-23 23:45 UTCGHSA enrichmentGHSA-9jv8-9586-5r34 · GitHub severity CRITICAL · GitHub CVSS 9.8
  18. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.7% · 54th percentile
  19. 2026-10-23 01:27 UTCEG score recompute
  20. 2026-10-23 01:27 UTCVendor advisory
  21. 2026-10-23 01:27 UTCGHSA enrichmentGHSA-9jv8-9586-5r34 · GitHub severity CRITICAL · GitHub CVSS 9.8
  22. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.7% · 54th percentile
  23. 2026-10-22 02:28 UTCEG score recompute
  24. 2026-10-22 02:28 UTCVendor advisory
  25. 2026-10-22 02:28 UTCGHSA enrichmentGHSA-9jv8-9586-5r34 · GitHub severity CRITICAL · GitHub CVSS 9.8
  26. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.7% · 54th percentile
  27. 2026-10-21 04:13 UTCEG score recompute
  28. 2026-10-21 04:13 UTCVendor advisory
  29. 2026-10-21 04:13 UTCGHSA enrichmentGHSA-9jv8-9586-5r34 · GitHub severity CRITICAL · GitHub CVSS 9.8
  30. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.7% · 54th percentile
  31. 2026-10-20 05:53 UTCEG score recompute
  32. 2026-10-20 05:53 UTCVendor advisory
  33. 2026-10-20 05:52 UTCGHSA enrichmentGHSA-9jv8-9586-5r34 · GitHub severity CRITICAL · GitHub CVSS 9.8
  34. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  35. 2026-10-19 07:37 UTCEG score recompute
  36. 2026-10-19 07:37 UTCVendor advisory
  37. 2026-10-19 07:37 UTCGHSA enrichmentGHSA-9jv8-9586-5r34 · GitHub severity CRITICAL · GitHub CVSS 9.8
  38. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  39. 2026-10-18 09:20 UTCVendor advisory
  40. 2026-10-18 09:20 UTCGHSA enrichmentGHSA-9jv8-9586-5r34 · GitHub severity CRITICAL · GitHub CVSS 9.8
  41. 2026-10-18 03:39 UTCEG score recompute
  42. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  43. 2026-10-17 11:04 UTCEG score recompute
  44. 2026-10-17 11:04 UTCVendor advisory
  45. 2026-10-17 11:04 UTCGHSA enrichmentGHSA-9jv8-9586-5r34 · GitHub severity CRITICAL · GitHub CVSS 9.8
  46. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  47. 2026-10-16 12:50 UTCEG score recompute
  48. 2026-10-16 12:50 UTCVendor advisory
  49. 2026-10-16 12:50 UTCGHSA enrichmentGHSA-9jv8-9586-5r34 · GitHub severity CRITICAL · GitHub CVSS 9.8
  50. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  51. 2026-10-15 14:32 UTCEG score recompute
  52. 2026-10-15 14:32 UTCVendor advisory
  53. 2026-10-15 14:31 UTCGHSA enrichmentGHSA-9jv8-9586-5r34 · GitHub severity CRITICAL · GitHub CVSS 9.8
  54. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  55. 2026-10-14 09:08 UTCEG score recompute
  56. 2026-10-14 09:08 UTCVendor advisory
  57. 2026-10-14 09:07 UTCGHSA enrichmentGHSA-9jv8-9586-5r34 · GitHub severity CRITICAL · GitHub CVSS 9.8
  58. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  59. 2026-10-13 06:05 UTCEG score recompute
  60. 2026-10-13 06:05 UTCVendor advisory
  61. 2026-10-13 06:04 UTCGHSA enrichmentGHSA-9jv8-9586-5r34 · GitHub severity CRITICAL · GitHub CVSS 9.8
  62. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  63. 2026-10-12 16:05 UTCEG score recompute
  64. 2026-10-12 07:50 UTCVendor advisory
  65. 2026-10-12 07:50 UTCGHSA enrichmentGHSA-9jv8-9586-5r34 · GitHub severity CRITICAL · GitHub CVSS 9.8
  66. 2026-10-11 19:47 UTCEG score recompute
  67. 2026-10-11 17:01 UTCEG score recompute
  68. 2026-10-11 14:27 UTCEG score recompute
  69. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  70. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  71. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  72. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  73. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  74. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  75. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.7% · 53rd percentile

Frequently asked(5)

What is CVE-2026-44631?
CVE-2026-44631 is a critical-severity vulnerability; its CVE record was 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 the CVE record for CVE-2026-44631 published?
The CVE record for CVE-2026-44631 was published on June 8, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of July 23, 2026; the record at its source may have been updated since.
Is CVE-2026-44631 actively exploited?
CVE-2026-44631 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (43rd 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.