Description
HTTP response splitting vulnerability in multiple Apache HTTP Server modules with untrusted or compromised backend servers.
This issue affects Apache HTTP Server: from through 2.4.66.
Users are recommended to upgrade to version 2.4.67, which fixes the issue.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Apache Software Foundation | Apache HTTP Server | 2.4.0 – ≤ 2.4.66 | — |
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 | 2.4.67-1 | — |
| Debian 13 | apache2 | 2.4.67-1~deb13u2 | — |
| Debian 12 | apache2 | 2.4.67-1~deb12u2 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | apache2 | 2.4.66-2ubuntu2.1 | — |
| Ubuntu 25.10 | apache2 | 2.4.64-1ubuntu3.4 | — |
| Ubuntu 24.04 LTS | apache2 | 2.4.58-1ubuntu8.12 | — |
| Ubuntu 22.04 LTS | apache2 | 2.4.52-1ubuntu4.20 | — |
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+esm5 | USN-8571-1 |
| Ubuntu Pro 18.04 LTS | apache2 | 2.4.29-1ubuntu4.27+esm10 | USN-8571-1 |
| Ubuntu Pro 16.04 LTS | apache2 | 2.4.18-2ubuntu3.17+esm19 | USN-8571-1 |
| Ubuntu Pro 14.04 LTS | apache2 | 2.4.7-1ubuntu4.22+esm14 | USN-8571-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat JBoss Core Services 1 | jbcs-httpd24-httpd +6 | 2.4.62-17.el8jbcs | RHSA-2026:73076 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_http2 | 2.0.29-14.el8jbcs | RHSA-2026:73076 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_jk +1 | 1.2.50-18.redhat_1.el8jbcs | RHSA-2026:73076 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_md | 1:2.4.28-20.el8jbcs | RHSA-2026:73076 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_proxy_cluster | 1.3.22-13.el8jbcs | RHSA-2026:73076 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_security | 2.9.6-20.el8jbcs | RHSA-2026:73076 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_ssl +1 | 1:2.4.62-17.el8jbcs | RHSA-2026:73076 |
| Red Hat Hardened Images 1 | httpd +5 | 2.4.67-1.hum1 | RHSA-2026:17080 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP5 | apache2 | 2.4.66-150400.6.57.1 | SUSE-SU-2026:2686-1 |
| SLES 15 SP4 | apache2 | 2.4.66-150400.6.57.1 | SUSE-SU-2026:2686-1 |
| SLES 12 SP5 | apache2 +1 | 2.4.66-35.78.1 | SUSE-SU-2026:2641-1 |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | apache2 +6 | 2.4.66-160000.2.1 | SUSE-SU-2026:22209-1, SUSE-SU-2026:22199-1 |
| SLES for SAP 15 SP5 | apache2 | 2.4.66-150400.6.57.1 | SUSE-SU-2026:2686-1 |
| SLES for SAP 15 SP4 | apache2 | 2.4.66-150400.6.57.1 | SUSE-SU-2026:2686-1 |
| SLES 16.0 | apache2 +6 | 2.4.66-160000.2.1 | SUSE-SU-2026:22209-1, SUSE-SU-2026:22199-1 |
| SLE HPC 15 SP5 | apache2 | 2.4.66-150400.6.57.1 | SUSE-SU-2026:2686-1 |
| SLE HPC 15 SP4 | apache2 | 2.4.66-150400.6.57.1 | SUSE-SU-2026:2686-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | apache2 | 2.4.67-1.1 | openSUSE-SU-2026:10785-1 |
| openSUSE Leap 16.0 | apache2 +6 | 2.4.66-160000.2.1 | openSUSE-SU-2026:21115-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | apache2 | 2.4.67-r0 | — |
| Alpine v3.23 | apache2 | 2.4.67-r0 | — |
| Alpine v3.22 | apache2 | 2.4.67-r0 | — |
| Alpine v3.21 | apache2 | 2.4.67-r0 | — |
| Alpine v3.20 | apache2 | 2.4.67-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | httpd +8 | 2.4.67-1.amzn2023.0.1 | ALAS2023-2026-1720 |
| Amazon Linux 2023 | mod_ssl +1 | 1:2.4.67-1.amzn2023.0.1 | ALAS2023-2026-1720 |
| Amazon Linux 2 | httpd +7 | 2.4.67-1.amzn2.0.1 | ALAS2-2026-3314 |
| Amazon Linux 2 | mod_ssl +1 | 1:2.4.67-1.amzn2.0.1 | ALAS2-2026-3314 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | httpd | 2.4.67-1 | — |
Advisories 13
- WID-SEC-2026-1354 Apache HTTP Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 11, 2026
- RHSA-2026:17080 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 9, 2026
- RHSA-2026:73076 Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.62 SP6 security update Red Hat Security Advisories (RHSA) · Oct 2, 2026
- SUSE-SU-2026:2641-1 Security update for apache2 SUSE / openSUSE Security Updates · Aug 27, 2026
- USN-8571-1 apache2 vulnerabilities Ubuntu Security Notices (USN) · Jul 21, 2026
- SUSE-SU-2026:2686-1 Security update for apache2 SUSE / openSUSE Security Updates · Jul 1, 2026
- openSUSE-SU-2026:21115-1 Security update for apache2 SUSE / openSUSE Security Updates · Jun 30, 2026
- SUSE-SU-2026:22209-1 Security update for apache2 SUSE / openSUSE Security Updates · Jun 24, 2026
- SUSE-SU-2026:22199-1 Security update for apache2 SUSE / openSUSE Security Updates · Jun 24, 2026
- ALAS2-2026-3314 Important: httpd security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · May 26, 2026
- ALAS2023-2026-1720 Important: httpd security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · May 26, 2026
- openSUSE-SU-2026:10785-1 apache2-2.4.67-1.1 on GA media SUSE / openSUSE Security Updates · May 17, 2026
- NCSC-2026-0134 Kwetsbaarheden verholpen in Apache HTTP Server NCSC-NL (Netherlands) · May 6, 2026
References
- https://httpd.apache.org/security/vulnerabilities_24.html vendor-advisory