Description
Late Release of Memory after Effective Lifetime vulnerability in Apache HTTP Server.
This issue affects Apache HTTP Server: from 2.4.17 up to 2.4.63.
Users are recommended to upgrade to version 2.4.64, which fixes the issue.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Apache Software Foundation | Apache HTTP Server | 2.4.17 – ≤ 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 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 3 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-7639-2 |
| Ubuntu Pro 18.04 LTS | apache2 | 2.4.29-1ubuntu4.27+esm6 | USN-7639-2 |
| Ubuntu Pro 16.04 LTS | apache2 | 2.4.18-2ubuntu3.17+esm16 | USN-7639-2 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | mod_http2 | 2.0.29-4.el10_2 | RHSA-2026:22528 |
| RHEL 9 | mod_http2 | 2.0.26-6.el9_8 | RHSA-2026:22551 |
| RHEL 8 | httpd +6 | 2.4.37-65.module+el8.10.0+24281+ea10630c.8 | RHSA-2026:22140 |
| RHEL 8 | mod_http2 | 1.15.7-10.module+el8.10.0+24315+35fe59d0.5 | RHSA-2026:22140 |
| RHEL 8 | mod_md | 1:2.0.8-8.module+el8.10.0+23815+1b5e1c66.2 | RHSA-2026:22140 |
| RHEL 8 | mod_ssl +1 | 1:2.4.37-65.module+el8.10.0+24281+ea10630c.8 | RHSA-2026:22140 |
Show 11 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10.0 EUS | mod_http2 | 2.0.29-2.el10_0.2 | RHSA-2026:50538 |
| RHEL 9.6 EUS | mod_http2 | 2.0.26-4.el9_6.2 | RHSA-2026:50572 |
| RHEL 9.4 E4S | mod_http2 | 2.0.26-2.el9_4.3 | RHSA-2026:55992 |
| RHEL 9.2 E4S | mod_http2 | 1.15.19-4.el9_2.8 | RHSA-2026:55930 |
| RHEL 8.8 TUS | httpd +6 | 2.4.37-56.module+el8.8.0+24497+e470c0e2.12 | RHSA-2026:36373 |
| RHEL 8.8 TUS | mod_http2 | 1.15.7-8.module+el8.8.0+24497+e470c0e2.7 | RHSA-2026:36373 |
| RHEL 8.8 TUS | mod_md | 1:2.0.8-8.module+el8.8.0+23840+d7e7db80.1 | RHSA-2026:36373 |
| RHEL 8.8 TUS | mod_ssl +1 | 1:2.4.37-56.module+el8.8.0+24497+e470c0e2.12 | RHSA-2026:36373 |
| RHEL 8.8 E4S | httpd +6 | 2.4.37-56.module+el8.8.0+24497+e470c0e2.12 | RHSA-2026:36373 |
| RHEL 8.8 E4S | mod_http2 | 1.15.7-8.module+el8.8.0+24497+e470c0e2.7 | RHSA-2026:36373 |
| RHEL 8.8 E4S | mod_md | 1:2.0.8-8.module+el8.8.0+23840+d7e7db80.1 | RHSA-2026:36373 |
| RHEL 8.8 E4S | mod_ssl +1 | 1:2.4.37-56.module+el8.8.0+24497+e470c0e2.12 | RHSA-2026:36373 |
| RHEL 8.6 EUS Long Life | httpd +6 | 2.4.37-47.module+el8.6.0+24496+af8fe930.13 | RHSA-2026:36831 |
| RHEL 8.6 EUS Long Life | mod_http2 | 1.15.7-5.module+el8.6.0+24496+af8fe930.5 | RHSA-2026:36831 |
| RHEL 8.6 EUS Long Life | mod_md | 1:2.0.8-8.module+el8.6.0+23843+c27a5dc4.1 | RHSA-2026:36831 |
| RHEL 8.6 EUS Long Life | mod_ssl +1 | 1:2.4.37-47.module+el8.6.0+24496+af8fe930.13 | RHSA-2026:36831 |
| RHEL 8.6 AUS | httpd +6 | 2.4.37-47.module+el8.6.0+24496+af8fe930.13 | RHSA-2026:36831 |
| RHEL 8.6 AUS | mod_http2 | 1.15.7-5.module+el8.6.0+24496+af8fe930.5 | RHSA-2026:36831 |
| RHEL 8.6 AUS | mod_md | 1:2.0.8-8.module+el8.6.0+23843+c27a5dc4.1 | RHSA-2026:36831 |
| RHEL 8.6 AUS | mod_ssl +1 | 1:2.4.37-47.module+el8.6.0+24496+af8fe930.13 | RHSA-2026:36831 |
| RHEL 8.4 EUS Long Life | httpd +6 | 2.4.37-39.module+el8.4.0+24495+1afced82.12 | RHSA-2026:36846 |
| RHEL 8.4 EUS Long Life | mod_http2 | 1.15.7-3.module+el8.4.0+24495+1afced82.5 | RHSA-2026:36846 |
| RHEL 8.4 EUS Long Life | mod_md | 1:2.0.8-8.module+el8.4.0+23842+00253415.1 | RHSA-2026:36846 |
| RHEL 8.4 EUS Long Life | mod_ssl +1 | 1:2.4.37-39.module+el8.4.0+24495+1afced82.12 | RHSA-2026:36846 |
| RHEL 8.4 AUS | httpd +6 | 2.4.37-39.module+el8.4.0+24495+1afced82.12 | RHSA-2026:36846 |
| RHEL 8.4 AUS | mod_http2 | 1.15.7-3.module+el8.4.0+24495+1afced82.5 | RHSA-2026:36846 |
| RHEL 8.4 AUS | mod_md | 1:2.0.8-8.module+el8.4.0+23842+00253415.1 | RHSA-2026:36846 |
| RHEL 8.4 AUS | mod_ssl +1 | 1:2.4.37-39.module+el8.4.0+24495+1afced82.12 | RHSA-2026:36846 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-httpd +6 | 2.4.62-13.el7jbcs | RHSA-2026:27200 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_http2 | 2.0.29-10.el7jbcs | RHSA-2026:27200 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_md | 1:2.4.28-16.el7jbcs | RHSA-2026:27200 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_ssl +1 | 1:2.4.62-13.el7jbcs | RHSA-2026:27200 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-nghttp2 +1 | 1.64.0-3.el7jbcs | RHSA-2026:27200 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | mod_http2 | 2.0.29-4.el10_2 | ALSA-2026:22528 |
| AlmaLinux 9 | mod_http2 | 2.0.26-6.el9_8 | ALSA-2026:22551 |
| AlmaLinux 8 | httpd +6 | 2.4.37-65.module_el8.10.0+4185+0955a0d7.8 | ALSA-2026:22140 |
| AlmaLinux 8 | mod_http2 | 1.15.7-10.module_el8.10.0+4185+0955a0d7.5 | ALSA-2026:22140 |
| AlmaLinux 8 | mod_md | 1:2.0.8-8.module_el8.10.0+4088+57f011c1.2 | ALSA-2026:22140 |
| AlmaLinux 8 | mod_ssl +1 | 1:2.4.37-65.module_el8.10.0+4185+0955a0d7.8 | ALSA-2026:22140 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | mod_http2 | 2.0.29-4.el10_2 | RLSA-2026:22528 |
| Rocky Linux 9 | mod_http2 | 2.0.26-6.el9_8 | RLSA-2026:22551 |
| Rocky Linux 8 | httpd | 2.4.37-65.module+el8.10.0+1830+22f0c9e0 | RLSA-2026:22140 |
| Rocky Linux 8 | mod_http2 | 1.15.7-10.module+el8.10.0+1775+6b057638 | RLSA-2026:22140 |
| Rocky Linux 8 | mod_md | 1:2.0.8-8.module+el8.9.0+1370+89cc8ad5 | RLSA-2026:22140 |
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 2 (CBL-Mariner) | httpd | 2.4.64-1 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | mod_http2 | 2.0.29-4.el10_2.2 | ELSA-2026-22528 |
| Oracle Linux 9 | mod_http2 | 2.0.26-6.el9_8.1 | ELSA-2026-22551 |
| Oracle Linux 8 | httpd +6 | 2.4.37-65.0.1.module+el8.10.0+90899+db89cbcc.7 | ELSA-2026-22140 |
| Oracle Linux 8 | mod_http2 | 1.15.7-10.module+el8.10.0+90899+db89cbcc.5 | ELSA-2026-22140 |
| Oracle Linux 8 | mod_md | 1:2.0.8-8.module+el8.10.0+90899+db89cbcc.2 | ELSA-2026-22140 |
| Oracle Linux 8 | mod_ssl +1 | 1:2.4.37-65.0.1.module+el8.10.0+90899+db89cbcc.7 | ELSA-2026-22140 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
GitHub 1 repository
-
galbarnahum/CVE-2025-53020-PoC ★ 2 · Jan 12, 2026
PoC for CVE-2025-53020 - HPACK bombing for Apache HTTPD.
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 34
- WID-SEC-2025-1529 Apache HTTP Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 11, 2026
- ALSA-2026:22551 Moderate: mod_http2 security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:22528 Moderate: mod_http2 security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:22140 Important: httpd:2.4 security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2026:27200 Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.62 SP4 security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:55992 Red Hat Security Advisory: mod_http2 security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2026:55930 Red Hat Security Advisory: mod_http2 security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2026:50538 Red Hat Security Advisory: mod_http2 security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2026:50572 Red Hat Security Advisory: mod_http2 security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2026:36831 Red Hat Security Advisory: httpd:2.4 security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2026:36846 Red Hat Security Advisory: httpd:2.4 security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2026:36373 Red Hat Security Advisory: httpd:2.4 security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2026:22528 Red Hat Security Advisory: mod_http2 security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2026:22551 Red Hat Security Advisory: mod_http2 security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2026:22140 Red Hat Security Advisory: httpd:2.4 security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- ELSA-2026-22528 Moderate: mod_http2 security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jul 17, 2026
- SUSE-SU-2026:2686-1 Security update for apache2 SUSE / openSUSE Security Updates · Jul 1, 2026
- ELSA-2026-22551 Moderate: mod_http2 security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jun 26, 2026
- USN-7639-2 apache2 vulnerabilities Ubuntu Security Notices (USN) · Jun 25, 2026
- RLSA-2026:22528 Moderate: mod_http2 security update Rocky Linux Security Advisories · Jun 5, 2026
- RLSA-2026:22551 Moderate: mod_http2 security update Rocky Linux Security Advisories · Jun 5, 2026
- RLSA-2026:22140 Important: httpd:2.4 security update Rocky Linux Security Advisories · Jun 1, 2026
- ELSA-2026-22140 Important: httpd:2.4 security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jun 1, 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
- 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