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01 Record

CVE-2026-33857

Apache HTTP Server: Off-by-one OOB reads in AJP getter functions

MediumPUBLISHEDCNA: apache
CNA base score5.3 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
View raw JSON

02 Description

Apache HTTP Server: Off-by-one OOB reads in AJP getter functions

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 ImpactpartialSuccessful exploitation gives limited 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
0.39% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 33.1% of scored records. A rank, not a probability.
NVD base score
5.3 (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:L/I:N/A:N
NVD analysis status
Analyzed. NVD last modified this record on 2026-10-26.
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
2026-05-04 13:07Z5 MO AGO
Last updated
2026-05-04 17:32Z5 MO AGO
Reserved
2026-03-24
Assigning CNA
apache
Record state
PUBLISHED
Severity
Medium (CVSS 5.3)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Weaknesses
Data version
5.2
Document digest
db4640e147a321038389f3f15c41f31b6fc22a5356745f209a97a4da3df5c58d

05 Affected products

VendorProductVersionsPlatforms
Apache Software FoundationApache HTTP Server0 to 2.4.66—

06 References

07 Fixed in

AlmaLinux 8

  • httpd
    Fixed in 2.4.37-65.module_el8.10.0+4185+0955a0d7.8
  • httpd-devel
    Fixed in 2.4.37-65.module_el8.10.0+4185+0955a0d7.8
  • httpd-filesystem
    Fixed in 2.4.37-65.module_el8.10.0+4185+0955a0d7.8
  • httpd-manual
    Fixed in 2.4.37-65.module_el8.10.0+4185+0955a0d7.8
  • httpd-tools
    Fixed in 2.4.37-65.module_el8.10.0+4185+0955a0d7.8
  • mod_http2
    Fixed in 1.15.7-10.module_el8.10.0+4185+0955a0d7.5
  • mod_ldap
    Fixed in 2.4.37-65.module_el8.10.0+4185+0955a0d7.8
  • 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+4185+0955a0d7.8
  • mod_session
    Fixed in 2.4.37-65.module_el8.10.0+4185+0955a0d7.8
  • mod_ssl
    Fixed in 1:2.4.37-65.module_el8.10.0+4185+0955a0d7.8

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_8.1
  • httpd-core
    Fixed in 2.4.62-13.el9_8.1
  • httpd-devel
    Fixed in 2.4.62-13.el9_8.1
  • httpd-filesystem
    Fixed in 2.4.62-13.el9_8.1
  • httpd-manual
    Fixed in 2.4.62-13.el9_8.1
  • httpd-tools
    Fixed in 2.4.62-13.el9_8.1
  • mod_ldap
    Fixed in 2.4.62-13.el9_8.1
  • mod_lua
    Fixed in 2.4.62-13.el9_8.1
  • mod_proxy_html
    Fixed in 1:2.4.62-13.el9_8.1
  • mod_session
    Fixed in 2.4.62-13.el9_8.1
  • mod_ssl
    Fixed in 1:2.4.62-13.el9_8.1

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_2.1
  • httpd-core
    Fixed in 2.4.63-13.el10_2.1
  • httpd-devel
    Fixed in 2.4.63-13.el10_2.1
  • httpd-filesystem
    Fixed in 2.4.63-13.el10_2.1
  • httpd-manual
    Fixed in 2.4.63-13.el10_2.1
  • httpd-tools
    Fixed in 2.4.63-13.el10_2.1
  • mod_ldap
    Fixed in 2.4.63-13.el10_2.1
  • mod_lua
    Fixed in 2.4.63-13.el10_2.1
  • mod_proxy_html
    Fixed in 1:2.4.63-13.el10_2.1
  • mod_session
    Fixed in 2.4.63-13.el10_2.1
  • mod_ssl
    Fixed in 1:2.4.63-13.el10_2.1

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+4185+0955a0d7.8
  • httpd-devel
    Fixed in 2.4.37-65.module_el8.10.0+4185+0955a0d7.8
  • httpd-filesystem
    Fixed in 2.4.37-65.module_el8.10.0+4185+0955a0d7.8
  • httpd-manual
    Fixed in 2.4.37-65.module_el8.10.0+4185+0955a0d7.8
  • httpd-tools
    Fixed in 2.4.37-65.module_el8.10.0+4185+0955a0d7.8
  • mod_http2
    Fixed in 1.15.7-10.module_el8.10.0+4185+0955a0d7.5
  • mod_ldap
    Fixed in 2.4.37-65.module_el8.10.0+4185+0955a0d7.8
  • 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+4185+0955a0d7.8
  • mod_session
    Fixed in 2.4.37-65.module_el8.10.0+4185+0955a0d7.8
  • mod_ssl
    Fixed in 1:2.4.37-65.module_el8.10.0+4185+0955a0d7.8

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_8.1
  • httpd-core
    Fixed in 2.4.62-13.el9_8.1
  • httpd-devel
    Fixed in 2.4.62-13.el9_8.1
  • httpd-filesystem
    Fixed in 2.4.62-13.el9_8.1
  • httpd-manual
    Fixed in 2.4.62-13.el9_8.1
  • httpd-tools
    Fixed in 2.4.62-13.el9_8.1
  • mod_ldap
    Fixed in 2.4.62-13.el9_8.1
  • mod_lua
    Fixed in 2.4.62-13.el9_8.1
  • mod_proxy_html
    Fixed in 1:2.4.62-13.el9_8.1
  • mod_session
    Fixed in 2.4.62-13.el9_8.1
  • mod_ssl
    Fixed in 1:2.4.62-13.el9_8.1

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_2.1
  • httpd-core
    Fixed in 2.4.63-13.el10_2.1
  • httpd-devel
    Fixed in 2.4.63-13.el10_2.1
  • httpd-filesystem
    Fixed in 2.4.63-13.el10_2.1
  • httpd-manual
    Fixed in 2.4.63-13.el10_2.1
  • httpd-tools
    Fixed in 2.4.63-13.el10_2.1
  • mod_ldap
    Fixed in 2.4.63-13.el10_2.1
  • mod_lua
    Fixed in 2.4.63-13.el10_2.1
  • mod_proxy_html
    Fixed in 1:2.4.63-13.el10_2.1
  • mod_session
    Fixed in 2.4.63-13.el10_2.1
  • mod_ssl
    Fixed in 1:2.4.63-13.el10_2.1

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 2.4.67-1~deb12u2

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

Debian 13

  • apache2
    Fixed in 2.4.67-1~deb13u2

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

Debian 14

  • apache2
    Fixed in 2.4.67-1

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

Ubuntu 22.04 LTS

  • apache2
    Fixed in 2.4.52-1ubuntu4.20

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 2.4.58-1ubuntu8.12

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

Ubuntu 25.10

  • apache2
    Fixed in 2.4.64-1ubuntu3.4

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 2.4.66-2ubuntu2.1

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

Ubuntu Pro 14.04 LTS

  • apache2
    Fixed in 2.4.7-1ubuntu4.22+esm14
    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 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.