CVE & CISA-KEV Catalog

CVE-2026-49975

HIGHEPSS 98th pctl

7.5

CVSS v3

Description

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.

CWE-789 CWE-409

How to fix

Remediation Available

mod_http2Amazon

Fixed in:0:2.0.42-1.amzn2.0.1

Fixed in:0:2.0.42-1.amzn2.0.1

Fixed in:0:2.0.42-1.amzn2.0.1

Fixed in:0:2.0.42-1.amzn2023.0.1

Fixed in:0:2.0.42-1.amzn2023.0.1

mod_http2-debuginfoAmazon

Fixed in:0:2.0.42-1.amzn2.0.1

Fixed in:0:2.0.42-1.amzn2.0.1

Fixed in:0:2.0.42-1.amzn2.0.1

Fixed in:0:2.0.42-1.amzn2023.0.1

Fixed in:0:2.0.42-1.amzn2023.0.1

mod_http2-debugsourceAmazon

Fixed in:0:2.0.42-1.amzn2023.0.1

Fixed in:0:2.0.42-1.amzn2023.0.1

apache2Debian

Fixed in:2.4.67-1~deb12u3CVE-2026-49975

Fixed in:2.4.67-1~deb13u3CVE-2026-49975

Fixed in:2.4.67-2CVE-2026-49975

httpdRocky

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.ppc64le::httpd:2.4RHSA-2026:25090

Fixed in:main@x86_64RHSA-2026:25042

Fixed in:main@srcRHSA-2026:25042

Fixed in:0:2.4.37-39.module+el8.4.0+24495+1afced82.12.x86_64::httpd:2.4RHSA-2026:36846

Fixed in:0:2.4.37-47.module+el8.6.0+24496+af8fe930.13.src::httpd:2.4RHSA-2026:36831

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.s390x::httpd:2.4RHSA-2026:25090

Fixed in:main@aarch64RHSA-2026:25042

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.x86_64::httpd:2.4RHSA-2026:25090

httpdRed Hat / RHEL

Fixed in:0:2.4.37-56.module+el8.8.0+24497+e470c0e2.12.ppc64le::httpd:2.4RHSA-2026:36373

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.src::httpd:2.4RHSA-2026:25090

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.x86_64::httpd:2.4RHSA-2026:25090

Fixed in:0:2.4.37-39.module+el8.4.0+24495+1afced82.12.src::httpd:2.4RHSA-2026:36846

Fixed in:0:2.4.37-39.module+el8.4.0+24495+1afced82.12.x86_64::httpd:2.4RHSA-2026:36846

Fixed in:0:2.4.37-56.module+el8.8.0+24497+e470c0e2.12.src::httpd:2.4RHSA-2026:36373

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.s390x::httpd:2.4RHSA-2026:25090

Fixed in:main@x86_64RHSA-2026:25042

httpd-debuginfoRed Hat / RHEL

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.s390x::httpd:2.4RHSA-2026:25090

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.ppc64le::httpd:2.4RHSA-2026:25090

Fixed in:0:2.4.37-56.module+el8.8.0+24497+e470c0e2.12.x86_64::httpd:2.4RHSA-2026:36373

Fixed in:0:2.4.37-47.module+el8.6.0+24496+af8fe930.13.x86_64::httpd:2.4RHSA-2026:36831

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.aarch64::httpd:2.4RHSA-2026:25090

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.x86_64::httpd:2.4RHSA-2026:25090

Fixed in:0:2.4.37-56.module+el8.8.0+24497+e470c0e2.12.ppc64le::httpd:2.4RHSA-2026:36373

Fixed in:0:2.4.37-39.module+el8.4.0+24495+1afced82.12.x86_64::httpd:2.4RHSA-2026:36846

httpd-debuginfoRocky

Fixed in:0:2.4.37-39.module+el8.4.0+24495+1afced82.12.x86_64::httpd:2.4RHSA-2026:36846

Fixed in:0:2.4.37-47.module+el8.6.0+24496+af8fe930.13.x86_64::httpd:2.4RHSA-2026:36831

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.x86_64::httpd:2.4RHSA-2026:25090

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.aarch64::httpd:2.4RHSA-2026:25090

Fixed in:0:2.4.37-56.module+el8.8.0+24497+e470c0e2.12.ppc64le::httpd:2.4RHSA-2026:36373

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.s390x::httpd:2.4RHSA-2026:25090

Fixed in:0:2.4.37-56.module+el8.8.0+24497+e470c0e2.12.x86_64::httpd:2.4RHSA-2026:36373

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.ppc64le::httpd:2.4RHSA-2026:25090

httpd-debugsourceRocky

Fixed in:0:2.4.37-39.module+el8.4.0+24495+1afced82.12.x86_64::httpd:2.4RHSA-2026:36846

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.ppc64le::httpd:2.4RHSA-2026:25090

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.aarch64::httpd:2.4RHSA-2026:25090

Fixed in:0:2.4.37-56.module+el8.8.0+24497+e470c0e2.12.ppc64le::httpd:2.4RHSA-2026:36373

Fixed in:0:2.4.37-56.module+el8.8.0+24497+e470c0e2.12.x86_64::httpd:2.4RHSA-2026:36373

Fixed in:0:2.4.37-47.module+el8.6.0+24496+af8fe930.13.x86_64::httpd:2.4RHSA-2026:36831

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.s390x::httpd:2.4RHSA-2026:25090

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.x86_64::httpd:2.4RHSA-2026:25090

httpd-debugsourceRed Hat / RHEL

Fixed in:0:2.4.37-56.module+el8.8.0+24497+e470c0e2.12.ppc64le::httpd:2.4RHSA-2026:36373

Fixed in:0:2.4.37-56.module+el8.8.0+24497+e470c0e2.12.x86_64::httpd:2.4RHSA-2026:36373

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.x86_64::httpd:2.4RHSA-2026:25090

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.s390x::httpd:2.4RHSA-2026:25090

Fixed in:0:2.4.37-39.module+el8.4.0+24495+1afced82.12.x86_64::httpd:2.4RHSA-2026:36846

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.ppc64le::httpd:2.4RHSA-2026:25090

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.aarch64::httpd:2.4RHSA-2026:25090

Fixed in:0:2.4.37-47.module+el8.6.0+24496+af8fe930.13.x86_64::httpd:2.4RHSA-2026:36831

httpd-develRed Hat / RHEL

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.s390x::httpd:2.4RHSA-2026:25090

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.x86_64::httpd:2.4RHSA-2026:25090

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.aarch64::httpd:2.4RHSA-2026:25090

Fixed in:0:2.4.37-56.module+el8.8.0+24497+e470c0e2.12.x86_64::httpd:2.4RHSA-2026:36373

Fixed in:0:2.4.37-56.module+el8.8.0+24497+e470c0e2.12.ppc64le::httpd:2.4RHSA-2026:36373

Fixed in:0:2.4.37-47.module+el8.6.0+24496+af8fe930.13.x86_64::httpd:2.4RHSA-2026:36831

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.ppc64le::httpd:2.4RHSA-2026:25090

Fixed in:0:2.4.37-39.module+el8.4.0+24495+1afced82.12.x86_64::httpd:2.4RHSA-2026:36846

httpd-develRocky

Fixed in:0:2.4.37-56.module+el8.8.0+24497+e470c0e2.12.x86_64::httpd:2.4RHSA-2026:36373

Fixed in:0:2.4.37-56.module+el8.8.0+24497+e470c0e2.12.ppc64le::httpd:2.4RHSA-2026:36373

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.x86_64::httpd:2.4RHSA-2026:25090

Fixed in:0:2.4.37-47.module+el8.6.0+24496+af8fe930.13.x86_64::httpd:2.4RHSA-2026:36831

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.aarch64::httpd:2.4RHSA-2026:25090

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.s390x::httpd:2.4RHSA-2026:25090

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.ppc64le::httpd:2.4RHSA-2026:25090

Fixed in:0:2.4.37-39.module+el8.4.0+24495+1afced82.12.x86_64::httpd:2.4RHSA-2026:36846

httpd-filesystemRed Hat / RHEL

Fixed in:0:2.4.37-39.module+el8.4.0+24495+1afced82.12.noarch::httpd:2.4RHSA-2026:36846

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.noarch::httpd:2.4RHSA-2026:25090

Fixed in:0:2.4.37-56.module+el8.8.0+24497+e470c0e2.12.noarch::httpd:2.4RHSA-2026:36373

Fixed in:0:2.4.37-47.module+el8.6.0+24496+af8fe930.13.noarch::httpd:2.4RHSA-2026:36831

httpd-filesystemRocky

Fixed in:0:2.4.37-39.module+el8.4.0+24495+1afced82.12.noarch::httpd:2.4RHSA-2026:36846

Fixed in:0:2.4.37-56.module+el8.8.0+24497+e470c0e2.12.noarch::httpd:2.4RHSA-2026:36373

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.noarch::httpd:2.4RHSA-2026:25090

Fixed in:0:2.4.37-47.module+el8.6.0+24496+af8fe930.13.noarch::httpd:2.4RHSA-2026:36831

httpd-manualRocky

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.noarch::httpd:2.4RHSA-2026:25090

Fixed in:0:2.4.37-56.module+el8.8.0+24497+e470c0e2.12.noarch::httpd:2.4RHSA-2026:36373

Fixed in:0:2.4.37-39.module+el8.4.0+24495+1afced82.12.noarch::httpd:2.4RHSA-2026:36846

Fixed in:0:2.4.37-47.module+el8.6.0+24496+af8fe930.13.noarch::httpd:2.4RHSA-2026:36831

httpd-manualRed Hat / RHEL

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.noarch::httpd:2.4RHSA-2026:25090

Fixed in:0:2.4.37-56.module+el8.8.0+24497+e470c0e2.12.noarch::httpd:2.4RHSA-2026:36373

Fixed in:0:2.4.37-47.module+el8.6.0+24496+af8fe930.13.noarch::httpd:2.4RHSA-2026:36831

Fixed in:0:2.4.37-39.module+el8.4.0+24495+1afced82.12.noarch::httpd:2.4RHSA-2026:36846

httpd-toolsRed Hat / RHEL

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.x86_64::httpd:2.4RHSA-2026:25090

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.s390x::httpd:2.4RHSA-2026:25090

Fixed in:0:2.4.37-39.module+el8.4.0+24495+1afced82.12.x86_64::httpd:2.4RHSA-2026:36846

Fixed in:0:2.4.37-56.module+el8.8.0+24497+e470c0e2.12.x86_64::httpd:2.4RHSA-2026:36373

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.ppc64le::httpd:2.4RHSA-2026:25090

Fixed in:0:2.4.37-56.module+el8.8.0+24497+e470c0e2.12.ppc64le::httpd:2.4RHSA-2026:36373

Fixed in:0:2.4.37-47.module+el8.6.0+24496+af8fe930.13.x86_64::httpd:2.4RHSA-2026:36831

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.aarch64::httpd:2.4RHSA-2026:25090

httpd-toolsRocky

Fixed in:0:2.4.37-56.module+el8.8.0+24497+e470c0e2.12.x86_64::httpd:2.4RHSA-2026:36373

Fixed in:0:2.4.37-56.module+el8.8.0+24497+e470c0e2.12.ppc64le::httpd:2.4RHSA-2026:36373

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.x86_64::httpd:2.4RHSA-2026:25090

Fixed in:0:2.4.37-47.module+el8.6.0+24496+af8fe930.13.x86_64::httpd:2.4RHSA-2026:36831

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.s390x::httpd:2.4RHSA-2026:25090

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.aarch64::httpd:2.4RHSA-2026:25090

Fixed in:0:2.4.37-39.module+el8.4.0+24495+1afced82.12.x86_64::httpd:2.4RHSA-2026:36846

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.ppc64le::httpd:2.4RHSA-2026:25090

httpd-tools-debuginfoRed Hat / RHEL

Fixed in:0:2.4.37-56.module+el8.8.0+24497+e470c0e2.12.x86_64::httpd:2.4RHSA-2026:36373

Fixed in:0:2.4.37-47.module+el8.6.0+24496+af8fe930.13.x86_64::httpd:2.4RHSA-2026:36831

Fixed in:0:2.4.37-39.module+el8.4.0+24495+1afced82.12.x86_64::httpd:2.4RHSA-2026:36846

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.x86_64::httpd:2.4RHSA-2026:25090

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.aarch64::httpd:2.4RHSA-2026:25090

Fixed in:0:2.4.37-56.module+el8.8.0+24497+e470c0e2.12.ppc64le::httpd:2.4RHSA-2026:36373

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.ppc64le::httpd:2.4RHSA-2026:25090

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.s390x::httpd:2.4RHSA-2026:25090

httpd-tools-debuginfoRocky

Fixed in:0:2.4.37-47.module+el8.6.0+24496+af8fe930.13.x86_64::httpd:2.4RHSA-2026:36831

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.s390x::httpd:2.4RHSA-2026:25090

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.aarch64::httpd:2.4RHSA-2026:25090

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.x86_64::httpd:2.4RHSA-2026:25090

Fixed in:0:2.4.37-56.module+el8.8.0+24497+e470c0e2.12.ppc64le::httpd:2.4RHSA-2026:36373

Fixed in:0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.ppc64le::httpd:2.4RHSA-2026:25090

Fixed in:0:2.4.37-56.module+el8.8.0+24497+e470c0e2.12.x86_64::httpd:2.4RHSA-2026:36373

Fixed in:0:2.4.37-39.module+el8.4.0+24495+1afced82.12.x86_64::httpd:2.4RHSA-2026:36846

jbcs-httpd24-httpdRocky

Fixed in:0:2.4.62-13.el7jbcsRHSA-2026:27200

Fixed in:0:2.4.62-13.el7jbcsRHSA-2026:27200

Fixed in:0:2.4.62-13.el8jbcsRHSA-2026:27200

Fixed in:0:2.4.62-13.el8jbcsRHSA-2026:27200

jbcs-httpd24-httpdRed Hat / RHEL

Fixed in:0:2.4.62-13.el7jbcsRHSA-2026:27200

This Red Hat / RHEL release reached end-of-life on 2024-06-30. Extended security maintenance is available until 2029-05-31.

Fixed in:0:2.4.62-13.el7jbcsRHSA-2026:27200

This Red Hat / RHEL release reached end-of-life on 2024-06-30. Extended security maintenance is available until 2029-05-31.

Fixed in:0:2.4.62-13.el8jbcsRHSA-2026:27200

Fixed in:0:2.4.62-13.el8jbcsRHSA-2026:27200

jbcs-httpd24-httpd-debuginfoRocky

Fixed in:0:2.4.62-13.el7jbcsRHSA-2026:27200

Fixed in:0:2.4.62-13.el8jbcsRHSA-2026:27200

jbcs-httpd24-httpd-debuginfoRed Hat / RHEL

Fixed in:0:2.4.62-13.el7jbcsRHSA-2026:27200

This Red Hat / RHEL release reached end-of-life on 2024-06-30. Extended security maintenance is available until 2029-05-31.

Fixed in:0:2.4.62-13.el8jbcsRHSA-2026:27200

jbcs-httpd24-httpd-develRed Hat / RHEL

Fixed in:0:2.4.62-13.el7jbcsRHSA-2026:27200

This Red Hat / RHEL release reached end-of-life on 2024-06-30. Extended security maintenance is available until 2029-05-31.

Fixed in:0:2.4.62-13.el8jbcsRHSA-2026:27200

jbcs-httpd24-httpd-develRocky

Fixed in:0:2.4.62-13.el7jbcsRHSA-2026:27200

Fixed in:0:2.4.62-13.el8jbcsRHSA-2026:27200

jbcs-httpd24-httpd-manualRocky

Fixed in:0:2.4.62-13.el7jbcsRHSA-2026:27200

Fixed in:0:2.4.62-13.el8jbcsRHSA-2026:27200

jbcs-httpd24-httpd-manualRed Hat / RHEL

Fixed in:0:2.4.62-13.el7jbcsRHSA-2026:27200

This Red Hat / RHEL release reached end-of-life on 2024-06-30. Extended security maintenance is available until 2029-05-31.

Fixed in:0:2.4.62-13.el8jbcsRHSA-2026:27200

jbcs-httpd24-httpd-selinuxRocky

Fixed in:0:2.4.62-13.el7jbcsRHSA-2026:27200

Fixed in:0:2.4.62-13.el8jbcsRHSA-2026:27200

jbcs-httpd24-httpd-selinuxRed Hat / RHEL

Fixed in:0:2.4.62-13.el7jbcsRHSA-2026:27200

This Red Hat / RHEL release reached end-of-life on 2024-06-30. Extended security maintenance is available until 2029-05-31.

Fixed in:0:2.4.62-13.el8jbcsRHSA-2026:27200

This vulnerability affects an unusually large number of packages. The highest-confidence fixes are shown above; the full list is longer. Check the referenced advisories for complete coverage.

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

34.30%probability of exploitation in 30 days

98thpercentile

Very high risk: more likely to be exploited than 98% of all known CVEs.

References

Related Vulnerabilities

Other CWE-789 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2022-30522	High	7.5	90%	-	Fix
CVE-2025-27533	High	7.5	8.7%	-	Fix
CVE-2017-7651	High	7.5	5.2%	-	Fix
CVE-2021-31811	Medium	5.5	3.4%	-	-
CVE-2021-27906	Medium	5.5	3.3%	-	Fix
CVE-2024-43484	High	7.5	2.9%	-	Fix

Common questions

How do I fix CVE-2026-49975?

Published advisories record a fix for 136 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2026-49975 being actively exploited?

Not that we know of. CVE-2026-49975 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 34.3% is the estimated probability that it will be exploited in the next 30 days. That is higher than 98% of all scored CVEs.

How severe is CVE-2026-49975?

CVE-2026-49975 has a CVSS v3 base score of 7.5, rated important. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-49975 affect?

Published advisories record a fix for mod_http2 (Amazon), mod_http2-debuginfo (Amazon), mod_http2-debugsource (Amazon), apache2 (Debian), and 132 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-08-19.