Description
HTTP response splitting in the core of Apache HTTP Server allows an attacker who can manipulate the Content-Type response headers of applications hosted or proxied by the server can split the HTTP response.
This vulnerability was described as CVE-2023-38709 but the patch included in Apache HTTP Server 2.4.59 did not address the issue.
Users are recommended to upgrade to version 2.4.64, which fixes this issue.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Apache Software Foundation | Apache HTTP Server | 2.4.0 – ≤ 2.4.63 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | apache2 | 2.4.64-1 | — |
| Debian 13 | apache2 | 2.4.64-1 | — |
| Debian 12 | apache2 | 2.4.65-1~deb12u1 | — |
| Debian 11 | apache2 | 2.4.65-1~deb11u1 | DLA-4270-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 25.10 | apache2 | 2.4.64-1ubuntu2 | — |
| Ubuntu 24.04 LTS | apache2 | 2.4.58-1ubuntu8.7 | USN-7639-1 |
| Ubuntu 22.04 LTS | apache2 | 2.4.52-1ubuntu4.15 | USN-7639-1 |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | apache2 | 2.4.41-4ubuntu3.23+esm2 | USN-8338-1, USN-7639-2 |
| Ubuntu Pro 18.04 LTS | apache2 | 2.4.29-1ubuntu4.27+esm6 | USN-8338-1, USN-7639-2 |
| Ubuntu Pro 16.04 LTS | apache2 | 2.4.18-2ubuntu3.17+esm16 | USN-8338-1, USN-7639-2 |
| Ubuntu Pro 14.04 LTS | apache2 | 2.4.7-1ubuntu4.22+esm12 | USN-8338-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | httpd +8 | 2.4.63-13.el10_2.4 | RHSA-2026:34109 |
| RHEL 10 | mod_ssl +1 | 1:2.4.63-13.el10_2.4 | RHSA-2026:34109 |
| RHEL 9 | httpd +8 | 2.4.62-13.el9_8.5 | RHSA-2026:41906 |
| RHEL 9 | mod_ssl +1 | 1:2.4.62-13.el9_8.5 | RHSA-2026:41906 |
| RHEL 8 | httpd +6 | 2.4.37-65.module+el8.10.0+24521+219dcfc5.9 | RHSA-2026:42828 |
| RHEL 8 | mod_http2 | 1.15.7-10.module+el8.10.0+24521+219dcfc5.7 | RHSA-2026:42828 |
| RHEL 8 | mod_md | 1:2.0.8-8.module+el8.10.0+23815+1b5e1c66.2 | RHSA-2026:42828 |
| RHEL 8 | mod_ssl +1 | 1:2.4.37-65.module+el8.10.0+24521+219dcfc5.9 | RHSA-2026:42828 |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10.0 EUS | httpd +8 | 2.4.63-1.el10_0.4 | RHSA-2026:47046 |
| RHEL 10.0 EUS | mod_ssl +1 | 1:2.4.63-1.el10_0.4 | RHSA-2026:47046 |
| RHEL 9.6 EUS | httpd +8 | 2.4.62-4.el9_6.6 | RHSA-2026:62165 |
| RHEL 9.6 EUS | mod_ssl +1 | 1:2.4.62-4.el9_6.6 | RHSA-2026:62165 |
| RHEL 9.4 E4S | httpd +2 | 2.4.57-11.el9_4.5 | RHSA-2026:66323 |
| RHEL 9.4 E4S | mod_ssl +1 | 1:2.4.57-11.el9_4.5 | RHSA-2026:66323 |
| RHEL 9.2 E4S | httpd +2 | 2.4.53-11.el9_2.15 | RHSA-2026:67152 |
| RHEL 9.2 E4S | mod_ssl +1 | 1:2.4.53-11.el9_2.15 | RHSA-2026:67152 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-httpd +6 | 2.4.62-16.el8jbcs | RHSA-2026:56868 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_http2 | 2.0.29-13.el8jbcs | RHSA-2026:56868 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_ssl +1 | 1:2.4.62-16.el8jbcs | RHSA-2026:56868 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | httpd +8 | 2.4.63-13.el10_2.4 | ALSA-2026:34109 |
| AlmaLinux 10 | mod_ssl +1 | 1:2.4.63-13.el10_2.4 | ALSA-2026:34109 |
| AlmaLinux 9 | httpd +8 | 2.4.62-13.el9_8.5 | ALSA-2026:41906 |
| AlmaLinux 9 | mod_ssl +1 | 1:2.4.62-13.el9_8.5 | ALSA-2026:41906 |
| AlmaLinux 8 | httpd +5 | 2.4.37-65.module_el8.10.0+4233+8b7d9181.9 | ALSA-2026:42828 |
| AlmaLinux 8 | mod_http2 | 1.15.7-10.module_el8.10.0+4233+8b7d9181.7 | ALSA-2026:42828 |
| AlmaLinux 8 | mod_md | 1:2.0.8-8.module_el8.10.0+4088+57f011c1.2 | ALSA-2026:42828 |
| AlmaLinux 8 | mod_ssl +1 | 1:2.4.37-65.module_el8.10.0+4233+8b7d9181.9 | ALSA-2026:42828 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | httpd | 2.4.63-13.el10_2.4 | RLSA-2026:34109 |
| Rocky Linux 9 | httpd | 2.4.62-13.el9_8.5 | RLSA-2026:41906 |
| Rocky Linux 8 | httpd | 2.4.37-65.module+el8.10.0+1830+22f0c9e0 | RLSA-2026:42828 |
| Rocky Linux 8 | mod_http2 | 1.15.7-10.module+el8.10.0+1775+6b057638 | RLSA-2026:42828 |
| Rocky Linux 8 | mod_md | 1:2.0.8-8.module+el8.9.0+1370+89cc8ad5 | RLSA-2026:42828 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | apache2 | 2.4.51-150400.6.46.1 | SUSE-SU-2025:02685-1, SUSE-SU-2025:02682-1 |
| SLES 15 SP7 | apache2-devel +4 | 2.4.62-150700.4.3.1 | SUSE-SU-2025:02685-1 |
| SLES 15 SP6 | apache2 | 2.4.51-150400.6.46.1 | SUSE-SU-2025:02684-1, SUSE-SU-2025:02682-1 |
| SLES 15 SP6 | apache2-devel +4 | 2.4.58-150600.5.35.1 | SUSE-SU-2025:02684-1 |
| SLES 15 SP5 | apache2 | 2.4.51-150400.6.46.1 | SUSE-SU-2026:2686-1, SUSE-SU-2025:02682-1 |
| SLES 15 SP4 | apache2 | 2.4.51-150400.6.46.1 | SUSE-SU-2026:2686-1, SUSE-SU-2025:02682-1 |
| SLES 15 SP3 | apache2 | 2.4.51-150200.3.82.1 | SUSE-SU-2025:02683-1 |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | apache2 +1 | 2.4.51-35.69.1 | SUSE-SU-2025:02565-1 |
| SLES for SAP 15 SP5 | apache2 | 2.4.51-150400.6.46.1 | SUSE-SU-2026:2686-1, SUSE-SU-2025:02682-1 |
| SLES for SAP 15 SP4 | apache2 | 2.4.51-150400.6.46.1 | SUSE-SU-2026:2686-1, SUSE-SU-2025:02682-1 |
| SLES for SAP 15 SP3 | apache2 | 2.4.51-150200.3.82.1 | SUSE-SU-2025:02683-1 |
| SLE HPC 15 SP5 | apache2 | 2.4.51-150400.6.46.1 | SUSE-SU-2026:2686-1, SUSE-SU-2025:02682-1 |
| SLE HPC 15 SP4 | apache2 | 2.4.51-150400.6.46.1 | SUSE-SU-2026:2686-1, SUSE-SU-2025:02682-1 |
| SLE HPC 15 SP3 | apache2 | 2.4.51-150200.3.82.1 | SUSE-SU-2025:02683-1 |
| SUSE Manager Server 4.3 | apache2 | 2.4.51-150400.6.46.1 | SUSE-SU-2025:02682-1 |
| SUSE Manager Proxy 4.3 | apache2 | 2.4.51-150400.6.46.1 | SUSE-SU-2025:02682-1 |
| SUSE Enterprise Storage 7.1 | apache2 | 2.4.51-150200.3.82.1 | SUSE-SU-2025:02683-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | apache2 | 2.4.64-1.1 | openSUSE-SU-2025:15360-1 |
| openSUSE Leap 15.6 | apache2 +6 | 2.4.58-150600.5.35.1 | SUSE-SU-2025:02684-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | apache2 | 2.4.64-r0 | — |
| Alpine v3.23 | apache2 | 2.4.64-r0 | — |
| Alpine v3.22 | apache2 | 2.4.64-r0 | — |
| Alpine v3.21 | apache2 | 2.4.64-r0 | — |
| Alpine v3.20 | apache2 | 2.4.64-r0 | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | apache2 | 2.4.64-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | httpd +8 | 2.4.64-1.amzn2023.0.1 | ALAS2023-2025-1125 |
| Amazon Linux 2023 | mod_ssl +1 | 1:2.4.64-1.amzn2023.0.1 | ALAS2023-2025-1125 |
| Amazon Linux 2 | httpd +7 | 2.4.64-1.amzn2.0.1 | ALAS2-2025-2958 |
| Amazon Linux 2 | mod_ssl +1 | 1:2.4.64-1.amzn2.0.1 | ALAS2-2025-2958 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | httpd | 2.4.64-1 | — |
| Azure Linux 3 | mod_http2 | No fix yet | — |
| Azure Linux 2 (CBL-Mariner) | httpd | 2.4.64-1 | — |
| Azure Linux 2 (CBL-Mariner) | mod_http2 | No fix yet | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | httpd +8 | 2.4.63-13.0.1.el10_2.4 | ELSA-2026-34109 |
| Oracle Linux 10 | mod_ssl +1 | 1:2.4.63-13.0.1.el10_2.4 | ELSA-2026-34109 |
| Oracle Linux 9 | httpd +8 | 2.4.62-13.0.1.el9_8.5 | ELSA-2026-41906 |
| Oracle Linux 9 | mod_ssl +1 | 1:2.4.62-13.0.1.el9_8.5 | ELSA-2026-41906 |
| Oracle Linux 8 | httpd +6 | 2.4.37-65.0.1.module+el8.10.0+90969+a6381771.8 | ELSA-2026-42828 |
| Oracle Linux 8 | mod_http2 | 1.15.7-10.module+el8.10.0+90969+a6381771.7 | ELSA-2026-42828 |
| Oracle Linux 8 | mod_md | 1:2.0.8-8.module+el8.10.0+90899+db89cbcc.2 | ELSA-2026-42828 |
| Oracle Linux 8 | mod_ssl +1 | 1:2.4.37-65.0.1.module+el8.10.0+90969+a6381771.8 | ELSA-2026-42828 |
Advisories 34
- WID-SEC-2025-1529 Apache HTTP Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 11, 2026
- ALSA-2026:34109 Important: httpd security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:41906 Important: httpd security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:42828 Important: httpd:2.4 security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2026:56868 Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.62 SP5 security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2026:67152 Red Hat Security Advisory: httpd security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2026:66323 Red Hat Security Advisory: httpd security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2026:62165 Red Hat Security Advisory: httpd security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2026:47046 Red Hat Security Advisory: httpd security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2026:42828 Red Hat Security Advisory: httpd:2.4 security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2026:41906 Red Hat Security Advisory: httpd security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2026:34109 Red Hat Security Advisory: httpd security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- WID-SEC-2026-0162 Oracle Fusion Middleware: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 24, 2026
- RLSA-2026:41906 Important: httpd security, bug fix, and enhancement update Rocky Linux Security Advisories · Jul 22, 2026
- ELSA-2026-42828 Important: httpd:2.4 security, bug fix, and enhancement update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jul 22, 2026
- RLSA-2026:42828 Important: httpd:2.4 security, bug fix, and enhancement update Rocky Linux Security Advisories · Jul 21, 2026
- ELSA-2026-41906 Important: httpd security, bug fix, and enhancement update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jul 20, 2026
- ELSA-2026-34109 Important: httpd security, bug fix, and enhancement update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jul 16, 2026
- RLSA-2026:34109 Important: httpd security, bug fix, and enhancement update Rocky Linux Security Advisories · Jul 7, 2026
- SUSE-SU-2026:2686-1 Security update for apache2 SUSE / openSUSE Security Updates · Jul 1, 2026
- USN-7639-2 apache2 vulnerabilities Ubuntu Security Notices (USN) · Jun 25, 2026
- USN-8338-1 apache2 vulnerabilities Ubuntu Security Notices (USN) · May 29, 2026
- USN-7639-1 apache2 vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- openSUSE-SU-2025:15360-1 apache2-2.4.64-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:02683-1 Security update for apache2 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:02682-1 Security update for apache2 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:02684-1 Security update for apache2 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:02685-1 Security update for apache2 SUSE / openSUSE Security Updates · Mar 23, 2026
- DLA-4270-1 apache2 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2025:02565-1 Security update for apache2 SUSE / openSUSE Security Updates · Feb 4, 2026
- NCSC-2026-0027 Kwetsbaarheden verholpen in Oracle Fusion Middleware NCSC-NL (Netherlands) · Jan 21, 2026
- WID-SEC-2025-1850 Xerox FreeFlow Print Server: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff BSI CERT-Bund (WID) · Nov 17, 2025
- ALAS2023-2025-1125 Important: httpd security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Aug 8, 2025
- ALAS2-2025-2958 Important: httpd security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Aug 4, 2025
References
- https://httpd.apache.org/security/vulnerabilities_24.html vendor-advisory