synced 13 MIN AGO
01 Record

CVE-2026-44631

Apache HTTP Server: Heap Underflow in `ap_regname` via Signed Char Overflow

CriticalPUBLISHEDCNA: apache
CNA base score9.8 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
View raw JSON

02 Description

Apache HTTP Server: Heap Underflow in `ap_regname` via Signed Char Overflow

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
  • Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.50% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 42.8% of scored records. A rank, not a probability.
NVD base score
9.8 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD analysis status
Analyzed. NVD last modified this record on 2026-07-23.
Red Hat severity
Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2026-06-08 15:19Z4 MO AGO
Last updated
2026-06-08 22:32Z4 MO AGO
Reserved
2026-05-07
Assigning CNA
apache
Record state
PUBLISHED
Severity
Critical (CVSS 9.8)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weaknesses
  • CWE-124Buffer Underwrite ('Buffer Underflow')Base
Data version
5.2
Document digest
7b5d7b44aedd4067f584ccd23c194c8719dbe7897ed3e6336d08d6d4f2e18b64

05 Affected products

VendorProductVersionsPlatforms
Apache Software FoundationApache HTTP Server2.4.0 to 2.4.67—

06 References

07 Fixed in

AlmaLinux 8

  • httpd
    Fixed in 2.4.37-65.module_el8.10.0+4233+8b7d9181.9
  • httpd-devel
    Fixed in 2.4.37-65.module_el8.10.0+4233+8b7d9181.9
  • httpd-manual
    Fixed in 2.4.37-65.module_el8.10.0+4233+8b7d9181.9
  • httpd-tools
    Fixed in 2.4.37-65.module_el8.10.0+4233+8b7d9181.9
  • mod_http2
    Fixed in 1.15.7-10.module_el8.10.0+4233+8b7d9181.7
  • mod_ldap
    Fixed in 2.4.37-65.module_el8.10.0+4233+8b7d9181.9
  • mod_md
    Fixed in 1:2.0.8-8.module_el8.10.0+4088+57f011c1.2
  • mod_proxy_html
    Fixed in 1:2.4.37-65.module_el8.10.0+4233+8b7d9181.9
  • mod_session
    Fixed in 2.4.37-65.module_el8.10.0+4233+8b7d9181.9
  • mod_ssl
    Fixed in 1:2.4.37-65.module_el8.10.0+4233+8b7d9181.9

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

AlmaLinux 9

  • httpd
    Fixed in 2.4.62-13.el9_8.5
  • httpd-core
    Fixed in 2.4.62-13.el9_8.5
  • httpd-devel
    Fixed in 2.4.62-13.el9_8.5
  • httpd-filesystem
    Fixed in 2.4.62-13.el9_8.5
  • httpd-manual
    Fixed in 2.4.62-13.el9_8.5
  • httpd-tools
    Fixed in 2.4.62-13.el9_8.5
  • mod_ldap
    Fixed in 2.4.62-13.el9_8.5
  • mod_lua
    Fixed in 2.4.62-13.el9_8.5
  • mod_proxy_html
    Fixed in 1:2.4.62-13.el9_8.5
  • mod_session
    Fixed in 2.4.62-13.el9_8.5
  • mod_ssl
    Fixed in 1:2.4.62-13.el9_8.5

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

AlmaLinux 10

  • httpd
    Fixed in 2.4.63-13.el10_2.4
  • httpd-core
    Fixed in 2.4.63-13.el10_2.4
  • httpd-devel
    Fixed in 2.4.63-13.el10_2.4
  • httpd-filesystem
    Fixed in 2.4.63-13.el10_2.4
  • httpd-manual
    Fixed in 2.4.63-13.el10_2.4
  • httpd-tools
    Fixed in 2.4.63-13.el10_2.4
  • mod_ldap
    Fixed in 2.4.63-13.el10_2.4
  • mod_lua
    Fixed in 2.4.63-13.el10_2.4
  • mod_proxy_html
    Fixed in 1:2.4.63-13.el10_2.4
  • mod_session
    Fixed in 2.4.63-13.el10_2.4
  • mod_ssl
    Fixed in 1:2.4.63-13.el10_2.4

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 8

  • httpd
    Fixed in 2.4.37-65.module_el8.10.0+4233+8b7d9181.9
  • httpd-devel
    Fixed in 2.4.37-65.module_el8.10.0+4233+8b7d9181.9
  • httpd-manual
    Fixed in 2.4.37-65.module_el8.10.0+4233+8b7d9181.9
  • httpd-tools
    Fixed in 2.4.37-65.module_el8.10.0+4233+8b7d9181.9
  • mod_http2
    Fixed in 1.15.7-10.module_el8.10.0+4233+8b7d9181.7
  • mod_ldap
    Fixed in 2.4.37-65.module_el8.10.0+4233+8b7d9181.9
  • mod_md
    Fixed in 1:2.0.8-8.module_el8.10.0+4088+57f011c1.2
  • mod_proxy_html
    Fixed in 1:2.4.37-65.module_el8.10.0+4233+8b7d9181.9
  • mod_session
    Fixed in 2.4.37-65.module_el8.10.0+4233+8b7d9181.9
  • mod_ssl
    Fixed in 1:2.4.37-65.module_el8.10.0+4233+8b7d9181.9

Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 9

  • httpd
    Fixed in 2.4.62-13.el9_8.5
  • httpd-core
    Fixed in 2.4.62-13.el9_8.5
  • httpd-devel
    Fixed in 2.4.62-13.el9_8.5
  • httpd-filesystem
    Fixed in 2.4.62-13.el9_8.5
  • httpd-manual
    Fixed in 2.4.62-13.el9_8.5
  • httpd-tools
    Fixed in 2.4.62-13.el9_8.5
  • mod_ldap
    Fixed in 2.4.62-13.el9_8.5
  • mod_lua
    Fixed in 2.4.62-13.el9_8.5
  • mod_proxy_html
    Fixed in 1:2.4.62-13.el9_8.5
  • mod_session
    Fixed in 2.4.62-13.el9_8.5
  • mod_ssl
    Fixed in 1:2.4.62-13.el9_8.5

Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 10

  • httpd
    Fixed in 2.4.63-13.el10_2.4
  • httpd-core
    Fixed in 2.4.63-13.el10_2.4
  • httpd-devel
    Fixed in 2.4.63-13.el10_2.4
  • httpd-filesystem
    Fixed in 2.4.63-13.el10_2.4
  • httpd-manual
    Fixed in 2.4.63-13.el10_2.4
  • httpd-tools
    Fixed in 2.4.63-13.el10_2.4
  • mod_ldap
    Fixed in 2.4.63-13.el10_2.4
  • mod_lua
    Fixed in 2.4.63-13.el10_2.4
  • mod_proxy_html
    Fixed in 1:2.4.63-13.el10_2.4
  • mod_session
    Fixed in 2.4.63-13.el10_2.4
  • mod_ssl
    Fixed in 1:2.4.63-13.el10_2.4

Derived from AlmaLinux 10. Partial coverage: only packages taken from AlmaLinux 10 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Debian 12

  • apache2
    Fixed in 2.4.68-1~deb12u1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

  • apache2
    Fixed in 2.4.68-1~deb13u1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

  • apache2
    Fixed in 2.4.68-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 22.04 LTS

  • apache2
    Fixed in 2.4.52-1ubuntu4.23

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 24.04 LTS

  • apache2
    Fixed in 2.4.58-1ubuntu8.15

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 25.10

  • apache2
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 26.04 LTS

  • apache2
    Fixed in 2.4.66-2ubuntu2.4

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 16.04 LTS

  • apache2
    Fixed in 2.4.18-2ubuntu3.17+esm19
    Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 18.04 LTS

  • apache2
    Fixed in 2.4.29-1ubuntu4.27+esm10
    Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 20.04 LTS

  • apache2
    Fixed in 2.4.41-4ubuntu3.23+esm5
    Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.