USN-8931-1: Apache HTTP Server vulnerabilities

Published Oct 14, 2026
·
Updated

이지웅 discovered that Apache HTTP Server exposed WebDAV property information. A remote attacker could possibly use this issue to obtain sensitive information. (CVE-2026-58415) Zhen Kong and Charles Vosburgh discovered that Apache HTTP Server did not properly validate FTP server responses. A remote attacker could possibly use this issue to make a forward proxy connect to an arbitrary host. (CVE-2026-63045) Hyojae Lee and Zhen Kong discovered that Apache HTTP Server incorrectly handled certain HTTP requests. A remote attacker could possibly use this issue to cause a denial of service or execute arbitrary code. (CVE-2026-63292) Lucian Nitescu and Zhen Kong discovered that Apache HTTP Server did not properly handle certain responses from backend servers. A remote attacker could possibly use this issue to cause a denial of service. (CVE-2026-63686) Qing Xu discovered that Apache HTTP Server incorrectly interpreted HTTP responses from backend servers. A remote attacker could possibly use this issue to perform HTTP response smuggling attacks. This issue only affected Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS. (CVE-2026-63718) Hyojae Lee discovered that Apache HTTP Server did not properly validate Digest authentication requests. A machine-in-the-middle attacker could possibly use this issue to bypass authentication. (CVE-2026-73636) Zhen Kong and Darren Carreras discovered that Apache HTTP Server did not properly manage authentication requests. A remote attacker could possibly use this issue to cause a denial of service. (CVE-2026-73637) Vlatko Kosturjak discovered that Apache HTTP Server did not properly enforce access restrictions for user directories. A remote attacker could possibly use this issue to obtain sensitive information. (CVE-2026-79768) Zhen Kong discovered that Apache HTTP Server did not properly handle certain WebDAV requests. An authenticated user could possibly use this issue to cause a denial of service or corrupt WebDAV property data. (CVE-2026-93546)

Affected Software

123 affected componentsFixes available
Apache HTTP Server
All of the following
ubuntu/apache2<2.4.66-2ubuntu2.6
2.4.66-2ubuntu2.6
Ubuntu Ubuntu=26.04
All of the following
ubuntu/apache2-bin<2.4.66-2ubuntu2.6
2.4.66-2ubuntu2.6
Ubuntu Ubuntu=26.04
All of the following
ubuntu/apache2-dev<2.4.66-2ubuntu2.6
2.4.66-2ubuntu2.6
Ubuntu Ubuntu=26.04
All of the following
ubuntu/apache2-ssl-dev<2.4.66-2ubuntu2.6
2.4.66-2ubuntu2.6
Ubuntu Ubuntu=26.04
All of the following
ubuntu/apache2-suexec-custom<2.4.66-2ubuntu2.6
2.4.66-2ubuntu2.6
Ubuntu Ubuntu=26.04
All of the following
ubuntu/apache2-suexec-pristine<2.4.66-2ubuntu2.6
2.4.66-2ubuntu2.6
Ubuntu Ubuntu=26.04
All of the following
ubuntu/apache2-utils<2.4.66-2ubuntu2.6
2.4.66-2ubuntu2.6
Ubuntu Ubuntu=26.04
All of the following
ubuntu/apache2<2.4.58-1ubuntu8.17
2.4.58-1ubuntu8.17
Ubuntu Ubuntu=24.04
All of the following
ubuntu/apache2-bin<2.4.58-1ubuntu8.17
2.4.58-1ubuntu8.17
Ubuntu Ubuntu=24.04
All of the following
ubuntu/apache2-dev<2.4.58-1ubuntu8.17
2.4.58-1ubuntu8.17
Ubuntu Ubuntu=24.04
All of the following
ubuntu/apache2-ssl-dev<2.4.58-1ubuntu8.17
2.4.58-1ubuntu8.17
Ubuntu Ubuntu=24.04
All of the following
ubuntu/apache2-suexec-custom<2.4.58-1ubuntu8.17
2.4.58-1ubuntu8.17
Ubuntu Ubuntu=24.04
All of the following
ubuntu/apache2-suexec-pristine<2.4.58-1ubuntu8.17
2.4.58-1ubuntu8.17
Ubuntu Ubuntu=24.04
All of the following
ubuntu/apache2-utils<2.4.58-1ubuntu8.17
2.4.58-1ubuntu8.17
Ubuntu Ubuntu=24.04
All of the following
ubuntu/libapache2-mod-md<2.4.58-1ubuntu8.17
2.4.58-1ubuntu8.17
Ubuntu Ubuntu=24.04
All of the following
ubuntu/libapache2-mod-proxy-uwsgi<2.4.58-1ubuntu8.17
2.4.58-1ubuntu8.17
Ubuntu Ubuntu=24.04
All of the following
ubuntu/apache2<2.4.52-1ubuntu4.25
2.4.52-1ubuntu4.25
Ubuntu Ubuntu=22.04
All of the following
ubuntu/apache2-bin<2.4.52-1ubuntu4.25
2.4.52-1ubuntu4.25
Ubuntu Ubuntu=22.04
All of the following
ubuntu/apache2-dev<2.4.52-1ubuntu4.25
2.4.52-1ubuntu4.25
Ubuntu Ubuntu=22.04
All of the following
ubuntu/apache2-ssl-dev<2.4.52-1ubuntu4.25
2.4.52-1ubuntu4.25
Ubuntu Ubuntu=22.04
All of the following
ubuntu/apache2-suexec-custom<2.4.52-1ubuntu4.25
2.4.52-1ubuntu4.25
Ubuntu Ubuntu=22.04
All of the following
ubuntu/apache2-suexec-pristine<2.4.52-1ubuntu4.25
2.4.52-1ubuntu4.25
Ubuntu Ubuntu=22.04
All of the following
ubuntu/apache2-utils<2.4.52-1ubuntu4.25
2.4.52-1ubuntu4.25
Ubuntu Ubuntu=22.04
All of the following
ubuntu/libapache2-mod-md<2.4.52-1ubuntu4.25
2.4.52-1ubuntu4.25
Ubuntu Ubuntu=22.04
All of the following
ubuntu/libapache2-mod-proxy-uwsgi<2.4.52-1ubuntu4.25
2.4.52-1ubuntu4.25
Ubuntu Ubuntu=22.04
All of the following
ubuntu/apache2<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=20.04
All of the following
ubuntu/apache2-bin<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=20.04
All of the following
ubuntu/apache2-dev<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=20.04
All of the following
ubuntu/apache2-ssl-dev<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=20.04
All of the following
ubuntu/apache2-suexec-custom<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=20.04
All of the following
ubuntu/apache2-suexec-pristine<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=20.04
All of the following
ubuntu/apache2-utils<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=20.04
All of the following
ubuntu/libapache2-mod-md<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=20.04
All of the following
ubuntu/libapache2-mod-proxy-uwsgi<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=20.04
All of the following
ubuntu/apache2<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=18.04
All of the following
ubuntu/apache2-bin<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=18.04
All of the following
ubuntu/apache2-dev<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=18.04
All of the following
ubuntu/apache2-ssl-dev<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=18.04
All of the following
ubuntu/apache2-suexec-custom<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=18.04
All of the following
ubuntu/apache2-suexec-pristine<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=18.04
All of the following
ubuntu/apache2-utils<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=18.04
All of the following
ubuntu/apache2<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=16.04
All of the following
ubuntu/apache2-bin<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=16.04
All of the following
ubuntu/apache2-dev<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=16.04
All of the following
ubuntu/apache2-suexec-custom<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=16.04
All of the following
ubuntu/apache2-suexec-pristine<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=16.04
All of the following
ubuntu/apache2-utils<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=16.04
All of the following
ubuntu/apache2<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=14.04
All of the following
ubuntu/apache2-bin<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=14.04
All of the following
ubuntu/apache2-dev<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=14.04
All of the following
ubuntu/apache2-mpm-event<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=14.04
All of the following
ubuntu/apache2-mpm-itk<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=14.04
All of the following
ubuntu/apache2-mpm-prefork<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=14.04
All of the following
ubuntu/apache2-mpm-worker<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=14.04
All of the following
ubuntu/apache2-suexec<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=14.04
All of the following
ubuntu/apache2-suexec-custom<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=14.04
All of the following
ubuntu/apache2-suexec-pristine<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=14.04
All of the following
ubuntu/apache2-utils<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=14.04
All of the following
ubuntu/apache2.2-bin<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=14.04
All of the following
ubuntu/libapache2-mod-macro<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=14.04
All of the following
ubuntu/libapache2-mod-proxy-html<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=14.04

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade ubuntu/apache2 to a version that resolves this vulnerability.

    Fixed in 2.4.66-2ubuntu2.6
  2. Upgrade

    Upgrade ubuntu/apache2-bin to a version that resolves this vulnerability.

    Fixed in 2.4.66-2ubuntu2.6
  3. Upgrade

    Upgrade ubuntu/apache2-dev to a version that resolves this vulnerability.

    Fixed in 2.4.66-2ubuntu2.6
  4. Upgrade

    Upgrade ubuntu/apache2-ssl-dev to a version that resolves this vulnerability.

    Fixed in 2.4.66-2ubuntu2.6
  5. Upgrade

    Upgrade ubuntu/apache2-suexec-custom to a version that resolves this vulnerability.

    Fixed in 2.4.66-2ubuntu2.6
  6. Upgrade

    Upgrade ubuntu/apache2-suexec-pristine to a version that resolves this vulnerability.

    Fixed in 2.4.66-2ubuntu2.6
  7. Upgrade

    Upgrade ubuntu/apache2-utils to a version that resolves this vulnerability.

    Fixed in 2.4.66-2ubuntu2.6
  8. Upgrade

    Upgrade ubuntu/apache2 to a version that resolves this vulnerability.

    Fixed in 2.4.58-1ubuntu8.17
  9. Upgrade

    Upgrade ubuntu/apache2-bin to a version that resolves this vulnerability.

    Fixed in 2.4.58-1ubuntu8.17
  10. Upgrade

    Upgrade ubuntu/apache2-dev to a version that resolves this vulnerability.

    Fixed in 2.4.58-1ubuntu8.17
  11. Upgrade

    Upgrade ubuntu/apache2-ssl-dev to a version that resolves this vulnerability.

    Fixed in 2.4.58-1ubuntu8.17
  12. Upgrade

    Upgrade ubuntu/apache2-suexec-custom to a version that resolves this vulnerability.

    Fixed in 2.4.58-1ubuntu8.17
  13. Upgrade

    Upgrade ubuntu/apache2-suexec-pristine to a version that resolves this vulnerability.

    Fixed in 2.4.58-1ubuntu8.17
  14. Upgrade

    Upgrade ubuntu/apache2-utils to a version that resolves this vulnerability.

    Fixed in 2.4.58-1ubuntu8.17
  15. Upgrade

    Upgrade ubuntu/libapache2-mod-md to a version that resolves this vulnerability.

    Fixed in 2.4.58-1ubuntu8.17
  16. Upgrade

    Upgrade ubuntu/libapache2-mod-proxy-uwsgi to a version that resolves this vulnerability.

    Fixed in 2.4.58-1ubuntu8.17
  17. Upgrade

    Upgrade ubuntu/apache2 to a version that resolves this vulnerability.

    Fixed in 2.4.52-1ubuntu4.25
  18. Upgrade

    Upgrade ubuntu/apache2-bin to a version that resolves this vulnerability.

    Fixed in 2.4.52-1ubuntu4.25
  19. Upgrade

    Upgrade ubuntu/apache2-dev to a version that resolves this vulnerability.

    Fixed in 2.4.52-1ubuntu4.25
  20. Upgrade

    Upgrade ubuntu/apache2-ssl-dev to a version that resolves this vulnerability.

    Fixed in 2.4.52-1ubuntu4.25
  21. Upgrade

    Upgrade ubuntu/apache2-suexec-custom to a version that resolves this vulnerability.

    Fixed in 2.4.52-1ubuntu4.25
  22. Upgrade

    Upgrade ubuntu/apache2-suexec-pristine to a version that resolves this vulnerability.

    Fixed in 2.4.52-1ubuntu4.25
  23. Upgrade

    Upgrade ubuntu/apache2-utils to a version that resolves this vulnerability.

    Fixed in 2.4.52-1ubuntu4.25
  24. Upgrade

    Upgrade ubuntu/libapache2-mod-md to a version that resolves this vulnerability.

    Fixed in 2.4.52-1ubuntu4.25
  25. Upgrade

    Upgrade ubuntu/libapache2-mod-proxy-uwsgi to a version that resolves this vulnerability.

    Fixed in 2.4.52-1ubuntu4.25
  26. Upgrade

    Upgrade ubuntu/apache2 to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  27. Upgrade

    Upgrade ubuntu/apache2-bin to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  28. Upgrade

    Upgrade ubuntu/apache2-dev to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  29. Upgrade

    Upgrade ubuntu/apache2-ssl-dev to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  30. Upgrade

    Upgrade ubuntu/apache2-suexec-custom to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  31. Upgrade

    Upgrade ubuntu/apache2-suexec-pristine to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  32. Upgrade

    Upgrade ubuntu/apache2-utils to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  33. Upgrade

    Upgrade ubuntu/libapache2-mod-md to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  34. Upgrade

    Upgrade ubuntu/libapache2-mod-proxy-uwsgi to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  35. Upgrade

    Upgrade ubuntu/apache2-mpm-event to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  36. Upgrade

    Upgrade ubuntu/apache2-mpm-itk to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  37. Upgrade

    Upgrade ubuntu/apache2-mpm-prefork to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  38. Upgrade

    Upgrade ubuntu/apache2-mpm-worker to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  39. Upgrade

    Upgrade ubuntu/apache2-suexec to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  40. Upgrade

    Upgrade ubuntu/apache2.2-bin to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  41. Upgrade

    Upgrade ubuntu/libapache2-mod-macro to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  42. Upgrade

    Upgrade ubuntu/libapache2-mod-proxy-html to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  43. Compensating control

    Enforce access restrictions for user directories.

Event History

Oct 14, 2026
Advisory Published
via Ubuntu·12:00 AM
Data Sourced
via Ubuntu·12:00 AM
DescriptionAffected Software

Child vulnerabilities

Contains the following vulnerabilities.

Frequently Asked Questions

1

Which CVEs are covered by this advisory?

The advisory references CVE-2026-93546, CVE-2026-79768, and CVE-2026-73637.

2

What risk value is assigned to this advisory?

The assigned risk value is 39.

Company

Resources

Contact

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