Description
Serving WebSocket protocol upgrades over a HTTP/2 connection could result in a Null Pointer dereference, leading to a crash of the server process, degrading performance.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Apache Software Foundation | Apache HTTP Server | 2.4.55 – ≤ 2.4.59 | — |
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 | 2.4.60-1 | — |
| Debian 13 | apache2 | 2.4.60-1 | — |
| Debian 12 | apache2 | 2.4.61-1~deb12u1 | DSA-5729-1 |
| Debian 11 | apache2 | 2.4.61-1~deb11u1 | DSA-5729-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | apache2 | 2.4.58-1ubuntu8.2 | USN-6885-1 |
| Ubuntu 22.04 LTS | apache2 | 2.4.52-1ubuntu4.10 | USN-6885-1 |
| Ubuntu 20.04 LTS | apache2 | 2.4.41-4ubuntu3.19 | USN-6885-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | mod_http2 | 2.0.26-2.el9_4.1 | RHSA-2024:8680 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat JBoss Core Services 1 | jbcs-httpd24-httpd +6 | 2.4.62-5.el7jbcs | RHSA-2025:3452 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_http2 | 2.0.29-3.el7jbcs | RHSA-2025:3452 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_ssl +1 | 1:2.4.62-5.el7jbcs | RHSA-2025:3452 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-openssl +4 | 1:1.1.1k-19.el7jbcs | RHSA-2025:3452 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | mod_http2 | 2.0.26-2.el9_4.1 | ALSA-2024:8680 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 9 | mod_http2 | 2.0.26-2.el9_4.1 | RLSA-2024:8680 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP6 | apache2 +5 | 2.4.58-150600.5.18.1 | SUSE-SU-2024:2597-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | apache2 | 2.4.61-1.1 | openSUSE-SU-2024:14116-1 |
| openSUSE Leap 15.6 | apache2 +6 | 2.4.58-150600.5.18.1 | SUSE-SU-2024:2597-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | apache2 | 2.4.60-r0 | — |
| Alpine v3.23 | apache2 | 2.4.60-r0 | — |
| Alpine v3.22 | apache2 | 2.4.60-r0 | — |
| Alpine v3.21 | apache2 | 2.4.60-r0 | — |
| Alpine v3.20 | apache2 | 2.4.60-r0 | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | apache2 | 2.4.60-r0 | — |
| Alpine v3.18 | apache2 | 2.4.60-r0 | — |
| Alpine v3.17 | apache2 | 2.4.60-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | mod_http2 | 2.0.27-1.amzn2023.0.3 | ALAS2023-2024-689 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | httpd | 2.4.61-1 | — |
| Azure Linux 2 (CBL-Mariner) | httpd | 2.4.61-1 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | mod_http2 | 2.0.26-2.el9_4.1 | ELSA-2024-8680 |
Advisories 13
- WID-SEC-2024-1504 Apache HTTP Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 11, 2026
- ALSA-2024:8680 Low: mod_http2 security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2025:3452 Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.62 security update Red Hat Security Advisories (RHSA) · Oct 9, 2026
- RHSA-2024:8680 Red Hat Security Advisory: mod_http2 security update Red Hat Security Advisories (RHSA) · Sep 17, 2026
- USN-6885-1 apache2 vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DSA-5729-1 apache2 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2024:8680 Low: mod_http2 security update Rocky Linux Security Advisories · Feb 5, 2026
- openSUSE-SU-2024:14116-1 apache2-2.4.61-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:2597-1 Security update for apache2 SUSE / openSUSE Security Updates · Feb 4, 2026
- ELSA-2024-8680 Low: mod_http2 security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Oct 30, 2024
- NCSC-2024-0411 Kwetsbaarheden verholpen in Oracle Database producten NCSC-NL (Netherlands) · Oct 17, 2024
- ALAS2023-2024-689 Moderate: mod_http2 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Aug 6, 2024
- NCSC-2024-0275 Kwetsbaarheden verholpen in Apache HHTP-server NCSC-NL (Netherlands) · Jul 2, 2024