Description
HTTP Response Smuggling vulnerability in Apache HTTP Server via mod_proxy_uwsgi. This issue affects Apache HTTP Server: from 2.4.30 through 2.4.55.
Special characters in the origin response header can truncate/split the response forwarded to the client.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Apache Software Foundation | Apache HTTP Server | 2.4.30 – ≤ 2.4.55 | — |
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 | 2.4.56-1 | — |
| Debian 13 | apache2 | 2.4.56-1 | — |
| Debian 12 | apache2 | 2.4.56-1 | — |
| Debian 11 | apache2 | 2.4.56-1~deb11u1 | DSA-5376-1 |
| Debian 10 | apache2 | 2.4.38-3+deb10u10 | DLA-3401-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | apache2 | 2.4.52-1ubuntu4.4 | USN-5942-1 |
| Ubuntu 20.04 LTS | apache2 | 2.4.41-4ubuntu3.14 | USN-5942-1 |
| Ubuntu 18.04 LTS | apache2 | 2.4.29-1ubuntu4.27 | USN-5942-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | httpd +8 | 2.4.57-5.el9 | RHSA-2023:6403 |
| RHEL 9 | mod_ssl +1 | 1:2.4.57-5.el9 | RHSA-2023:6403 |
| RHEL 8 | httpd +6 | 2.4.37-56.module+el8.8.0+19808+379766d6.7 | RHSA-2023:5050 |
| RHEL 8 | mod_http2 | 1.15.7-8.module+el8.8.0+18751+b4557bca.3 | RHSA-2023:5050 |
| RHEL 8 | mod_md | 1:2.0.8-8.module+el8.3.0+6814+67d1e611 | RHSA-2023:5050 |
| RHEL 8 | mod_ssl +1 | 1:2.4.37-56.module+el8.8.0+19808+379766d6.7 | RHSA-2023:5050 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.2 EUS | httpd +8 | 2.4.53-11.el9_2.6 | RHSA-2024:4504 |
| RHEL 9.2 EUS | mod_ssl +1 | 1:2.4.53-11.el9_2.6 | RHSA-2024:4504 |
| RHEL 8.6 EUS | httpd +6 | 2.4.37-47.module+el8.6.0+19809+6e655c60.7 | RHSA-2023:5049 |
| RHEL 8.6 EUS | mod_http2 | 1.15.7-5.module+el8.6.0+18506+34b194fb.2 | RHSA-2023:5049 |
| RHEL 8.6 EUS | mod_md | 1:2.0.8-8.module+el8.3.0+6814+67d1e611 | RHSA-2023:5049 |
| RHEL 8.6 EUS | mod_ssl +1 | 1:2.4.37-47.module+el8.6.0+19809+6e655c60.7 | RHSA-2023:5049 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-apr +1 | 1.7.0-8.el7jbcs | RHSA-2023:4629 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-curl +2 | 8.2.1-1.el7jbcs | RHSA-2023:4629 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-httpd +6 | 2.4.57-5.el7jbcs | RHSA-2023:4629 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_security | 2.9.3-29.el7jbcs | RHSA-2023:4629 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_ssl +1 | 1:2.4.57-5.el7jbcs | RHSA-2023:4629 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | httpd +8 | 2.4.57-5.el9 | ALSA-2023:6403 |
| AlmaLinux 9 | mod_ssl +1 | 1:2.4.57-5.el9 | ALSA-2023:6403 |
| AlmaLinux 8 | httpd +6 | 2.4.37-56.module_el8.8.0+3605+a3cf1030.7 | ALSA-2023:5050 |
| AlmaLinux 8 | mod_http2 | 1.15.7-8.module_el8.8.0+3554+ec1058a7.3 | ALSA-2023:5050 |
| AlmaLinux 8 | mod_md | 1:2.0.8-8.module_el8.6.0+2872+fe0ff7aa | ALSA-2023:5050 |
| AlmaLinux 8 | mod_ssl +1 | 1:2.4.37-56.module_el8.8.0+3605+a3cf1030.7 | ALSA-2023:5050 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | httpd | 2.4.37-56.module+el8.8.0+1284+07ef499e.6 | RLSA-2023:5050 |
| Rocky Linux 8 | mod_http2 | 1.15.7-8.module+el8.8.0+1284+07ef499e.3 | RLSA-2023:5050 |
| Rocky Linux 8 | mod_md | 1:2.0.8-8.module+el8.8.0+1271+9ed9553d | RLSA-2023:5050 |
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 | 2.4.51-150400.6.11.1 | SUSE-SU-2026:2686-1, SUSE-SU-2023:1658-1 |
| SLES 15 SP3 | apache2 | 2.4.51-150200.3.56.1 | SUSE-SU-2023:1573-1 |
| SLES 15 SP2 | apache2 | 2.4.51-150200.3.56.1 | SUSE-SU-2023:1573-1 |
| SLES 15 SP1 | apache2 | 2.4.33-150000.3.75.1 | SUSE-SU-2023:0799-1 |
Show 17 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | apache2 | 2.4.51-35.25.1 | SUSE-SU-2023:0764-1 |
| 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 for SAP 15 SP3 | apache2 | 2.4.51-150200.3.56.1 | SUSE-SU-2023:1573-1 |
| SLES for SAP 15 SP2 | apache2 | 2.4.51-150200.3.56.1 | SUSE-SU-2023:1573-1 |
| SLES for SAP 15 SP1 | apache2 | 2.4.33-150000.3.75.1 | SUSE-SU-2023:0799-1 |
| SLES for SAP 12 SP5 | apache2 | 2.4.51-35.25.1 | SUSE-SU-2023:0764-1 |
| SLE Real Time 15 SP3 | apache2 | 2.4.51-150200.3.56.1 | SUSE-SU-2023:1573-1 |
| 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 |
| SLE HPC 15 SP3 | apache2 | 2.4.51-150200.3.56.1 | SUSE-SU-2023:1573-1 |
| SLE HPC 15 SP2 | apache2 | 2.4.51-150200.3.56.1 | SUSE-SU-2023:1573-1 |
| SLE HPC 15 SP1 | apache2 | 2.4.33-150000.3.75.1 | SUSE-SU-2023:0799-1 |
| SUSE Manager Server 4.2 | apache2 | 2.4.51-150200.3.56.1 | SUSE-SU-2023:1573-1 |
| SUSE Manager Proxy 4.2 | apache2 | 2.4.51-150200.3.56.1 | SUSE-SU-2023:1573-1 |
| SUSE Enterprise Storage 7.1 | apache2 | 2.4.51-150200.3.56.1 | SUSE-SU-2023:1573-1 |
| SUSE Enterprise Storage 7 | apache2 | 2.4.51-150200.3.56.1 | SUSE-SU-2023:1573-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | apache2 | 2.4.56-1.1 | openSUSE-SU-2024:12776-1 |
| openSUSE Leap 15.4 | apache2 | 2.4.51-150400.6.11.1 | SUSE-SU-2023:1658-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | apache2 | 2.4.56-r0 | — |
| Alpine v3.23 | apache2 | 2.4.56-r0 | — |
| Alpine v3.22 | apache2 | 2.4.56-r0 | — |
| Alpine v3.21 | apache2 | 2.4.56-r0 | — |
| Alpine v3.20 | apache2 | 2.4.56-r0 | — |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | apache2 | 2.4.56-r0 | — |
| Alpine v3.18 | apache2 | 2.4.56-r0 | — |
| Alpine v3.17 | apache2 | 2.4.56-r0 | — |
| Alpine v3.16 | apache2 | 2.4.56-r0 | — |
| Alpine v3.15 | apache2 | 2.4.56-r0 | — |
| Alpine v3.14 | apache2 | 2.4.56-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | httpd +8 | 2.4.56-1.amzn2023 | ALAS2023-2023-136 |
| Amazon Linux 2023 | mod_ssl +1 | 1:2.4.56-1.amzn2023 | ALAS2023-2023-136 |
| Amazon Linux 2 | httpd +7 | 2.4.56-1.amzn2 | ALAS2-2023-1989 |
| Amazon Linux 2 | mod_ssl +1 | 1:2.4.56-1.amzn2 | ALAS2-2023-1989 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | httpd | 2.4.56-1 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | httpd +8 | 2.4.57-5.0.1.el9 | ELSA-2023-6403 |
| Oracle Linux 9 | mod_http2 | 1.15.19-5.el9 | ELSA-2023-6403 |
| Oracle Linux 9 | mod_ssl +1 | 1:2.4.57-5.0.1.el9 | ELSA-2023-6403 |
| Oracle Linux 8 | httpd +6 | 2.4.37-56.0.1.module+el8.8.0+21159+b5186791.7 | ELSA-2023-5050 |
| Oracle Linux 8 | mod_http2 | 1.15.7-8.module+el8.8.0+21057+13668aee.3 | ELSA-2023-5050 |
| Oracle Linux 8 | mod_md | 1:2.0.8-8.module+el8.5.0+20475+4f6a8fd5 | ELSA-2023-5050 |
| Oracle Linux 8 | mod_ssl +1 | 1:2.4.37-56.0.1.module+el8.8.0+21159+b5186791.7 | ELSA-2023-5050 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| PyPI | uwsgi | < 2.0.22 | 2.0.22 | GHSA-vcph-37mh-fqrh |
Advisories 33
- ALSA-2023:6403 Moderate: httpd and mod_http2 security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2023:5050 Moderate: httpd:2.4 security update AlmaLinux Security Advisories · Oct 29, 2026
- WID-SEC-2023-2031 Xerox FreeFlow Print Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 11, 2026
- RHSA-2024:4504 Red Hat Security Advisory: httpd security update Red Hat Security Advisories (RHSA) · Sep 21, 2026
- RHSA-2023:6403 Red Hat Security Advisory: httpd and mod_http2 security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Sep 21, 2026
- RHSA-2023:5050 Red Hat Security Advisory: httpd:2.4 security update Red Hat Security Advisories (RHSA) · Sep 21, 2026
- RHSA-2023:5049 Red Hat Security Advisory: httpd:2.4 security update Red Hat Security Advisories (RHSA) · Sep 21, 2026
- RHSA-2023:4629 Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.57 security update Red Hat Security Advisories (RHSA) · Sep 21, 2026
- WID-SEC-2023-0583 Apache HTTP Server: Mehrere Schwachstellen ermöglichen HTTP Response Splitting BSI CERT-Bund (WID) · Sep 10, 2026
- SUSE-SU-2026:2686-1 Security update for apache2 SUSE / openSUSE Security Updates · Jul 1, 2026
- USN-5942-1 apache2 vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DSA-5376-1 apache2 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3401-1 apache2 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2023:5050 Moderate: httpd:2.4 security update Rocky Linux Security Advisories · Feb 4, 2026
- openSUSE-SU-2024:12776-1 apache2-2.4.56-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:1573-1 Security update for apache2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:0799-1 Security update for apache2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:1658-1 Security update for apache2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:0764-1 Security update for apache2 SUSE / openSUSE Security Updates · Feb 4, 2026
- FSA-202302 Festo: Several vulnerabilities in FactoryViews CERT@VDE · Feb 2, 2026
- ICSA-26-027-02 Festo Didactic SE MES PC CISA ICS & IT advisories · Jan 27, 2026
- FSA-202402 Several Vulnerabilities in MES PC (Windows 10) CERT@VDE · Dec 8, 2025
- WID-SEC-2023-1424 Xerox FreeFlow Print Server für Solaris: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 6, 2025
- ICSA-25-133-01 Hitachi Energy Service Suite CISA ICS & IT advisories · Feb 25, 2025
- WID-SEC-2024-1591 Juniper JUNOS: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 11, 2024
- SSA-943925 SSA-943925: Multiple Vulnerabilities in SINEC NMS before V2.0 SP1 Siemens ProductCERT · Mar 12, 2024
- ICSA-24-046-15 Siemens SINEC NMS CISA ICS & IT advisories · Mar 12, 2024
- SSA-806742 SSA-806742: Multiple Vulnerabilities in SCALANCE XCM-/XRM-300 before V2.4 Siemens ProductCERT · Feb 13, 2024
- ICSA-24-046-11 Siemens SCALANCE XCM-/XRM-300 CISA ICS & IT advisories · Feb 13, 2024
- ELSA-2023-6403 Moderate: httpd and mod_http2 security, bug fix, and enhancement update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Nov 11, 2023
- ELSA-2023-5050 Moderate: httpd:2.4 security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Sep 12, 2023
- ALAS2023-2023-136 Important: httpd security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Mar 22, 2023
- ALAS2-2023-1989 Important: httpd security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Mar 21, 2023