High 7.5Published Jun 8, 2026

CVE-2026-49975Apache HTTP Server: mod_http2 denial of service

Updated under an hour ago (Oct 27, 2026, 7:10 AM ET)

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It affects Apache Software Foundation Apache HTTP Server and 13 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for Apache Software Foundation Apache HTTP Server

Exploited in the last 30 days

Memory Allocation with Excessive Size Value vulnerability in Apache HTTP Server's mod_http leads to denial of service via malicious HTTP requests. This issue affects Apache HTTP Server: from 2.4.17 through 2.4.67.

CVSS: 7.5 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-789, CWE-409
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: apache
NVD analysis: Modified
Record last updated: Aug 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Apache Software Foundation Apache HTTP Server apache_software_foundation:apache_http_server (from the name)	from 2.4.17 through 2.4.67	CNA record
Red Hat JBoss Core Services for RHEL 8 redhat:jboss_core_services	from 0:2.4.62-13.el8jbcs not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux	from 0:2.0.29-4.el10_2.1 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support redhat:enterprise_linux_eus	from 0:2.0.29-2.el10_0.2 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support redhat:rhel_aus	from 8040020260702193120.522a0ee4 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On redhat:rhel_eus_long_life	from 8040020260702193120.522a0ee4 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service redhat:rhel_tus	from 8080020260702200145.63b34585 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions redhat:rhel_e4s	from 8080020260702200145.63b34585 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support redhat:rhel_eus	from 0:2.0.26-4.el9_6.2 not affected	CISA ADP
Red Hat Red Hat Hardened Images redhat:hummingbird	from 2.4.68-1.hum1 not affected	CISA ADP
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References

References

https://httpd.apache.org/security/vulnerabilities_24.html	vendor-advisory
http://www.openwall.com/lists/oss-security/2026/06/03/3	mailing-list, third-party-advisory
http://www.openwall.com/lists/oss-security/2026/06/08/16	mailing-list, third-party-advisory
https://lists.debian.org/debian-lts-announce/2026/06/msg00009.html	mailing-list, third-party-advisory
https://access.redhat.com/errata/RHSA-2026:25042
https://access.redhat.com/errata/RHSA-2026:25057
https://access.redhat.com/errata/RHSA-2026:25090
https://access.redhat.com/errata/RHSA-2026:25225
https://access.redhat.com/errata/RHSA-2026:27114
https://access.redhat.com/errata/RHSA-2026:27200
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.