CVE-2026-63718

HIGH

8.2

CVSS v3

Description

Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') response smuggling vulnerability in Apache HTTP Server via mod_proxy_uwsgi and a crafted uwsgi response with Transfer-Encoding. This issue affects Apache HTTP Server: from 2.4.30 through 2.4.68.

CWE-444

How to fix

Remediation Available

apache2Debian

Fixed in:2.4.69-1~deb13u1CVE-2026-63718

Fixed in:2.4.69-1CVE-2026-63718

httpdRocky

Fixed in:0:2.4.63-13.el10_2.8RHSA-2026:89860

Fixed in:0:2.4.62-13.el9_8.9RHSA-2026:88229

httpdRed Hat / RHEL

Fixed in:0:2.4.63-13.el10_2.8RHSA-2026:89860

Fixed in:0:2.4.62-13.el9_8.9RHSA-2026:88229

httpd-coreRed Hat / RHEL

Fixed in:0:2.4.63-13.el10_2.8RHSA-2026:89860

Fixed in:0:2.4.62-13.el9_8.9RHSA-2026:88229

httpd-coreRocky

Fixed in:0:2.4.63-13.el10_2.8RHSA-2026:89860

Fixed in:0:2.4.62-13.el9_8.9RHSA-2026:88229

httpd-core-debuginfoRed Hat / RHEL

Fixed in:0:2.4.63-13.el10_2.8RHSA-2026:89860

Fixed in:0:2.4.62-13.el9_8.9RHSA-2026:88229

httpd-core-debuginfoRocky

Fixed in:0:2.4.63-13.el10_2.8RHSA-2026:89860

Fixed in:0:2.4.62-13.el9_8.9RHSA-2026:88229

httpd-debuginfoRocky

Fixed in:0:2.4.63-13.el10_2.8RHSA-2026:89860

Fixed in:0:2.4.62-13.el9_8.9RHSA-2026:88229

httpd-debuginfoRed Hat / RHEL

Fixed in:0:2.4.63-13.el10_2.8RHSA-2026:89860

Fixed in:0:2.4.62-13.el9_8.9RHSA-2026:88229

httpd-debugsourceRocky

Fixed in:0:2.4.63-13.el10_2.8RHSA-2026:89860

Fixed in:0:2.4.62-13.el9_8.9RHSA-2026:88229

httpd-debugsourceRed Hat / RHEL

Fixed in:0:2.4.63-13.el10_2.8RHSA-2026:89860

Fixed in:0:2.4.62-13.el9_8.9RHSA-2026:88229

httpd-develRocky

Fixed in:0:2.4.63-13.el10_2.8RHSA-2026:89860

Fixed in:0:2.4.62-13.el9_8.9RHSA-2026:88229

httpd-develRed Hat / RHEL

Fixed in:0:2.4.63-13.el10_2.8RHSA-2026:89860

Fixed in:0:2.4.62-13.el9_8.9RHSA-2026:88229

httpd-filesystemRed Hat / RHEL

Fixed in:0:2.4.63-13.el10_2.8RHSA-2026:89860

Fixed in:0:2.4.62-13.el9_8.9RHSA-2026:88229

httpd-filesystemRocky

Fixed in:0:2.4.63-13.el10_2.8RHSA-2026:89860

Fixed in:0:2.4.62-13.el9_8.9RHSA-2026:88229

httpd-manualRocky

Fixed in:0:2.4.63-13.el10_2.8RHSA-2026:89860

Fixed in:0:2.4.62-13.el9_8.9RHSA-2026:88229

httpd-manualRed Hat / RHEL

Fixed in:0:2.4.63-13.el10_2.8RHSA-2026:89860

Fixed in:0:2.4.62-13.el9_8.9RHSA-2026:88229

httpd-toolsRocky

Fixed in:0:2.4.63-13.el10_2.8RHSA-2026:89860

Fixed in:0:2.4.62-13.el9_8.9RHSA-2026:88229

httpd-toolsRed Hat / RHEL

Fixed in:0:2.4.63-13.el10_2.8RHSA-2026:89860

Fixed in:0:2.4.62-13.el9_8.9RHSA-2026:88229

httpd-tools-debuginfoRocky

Fixed in:0:2.4.63-13.el10_2.8RHSA-2026:89860

Fixed in:0:2.4.62-13.el9_8.9RHSA-2026:88229

httpd-tools-debuginfoRed Hat / RHEL

Fixed in:0:2.4.63-13.el10_2.8RHSA-2026:89860

Fixed in:0:2.4.62-13.el9_8.9RHSA-2026:88229

mod_ldapRed Hat / RHEL

Fixed in:0:2.4.63-13.el10_2.8RHSA-2026:89860

Fixed in:0:2.4.62-13.el9_8.9RHSA-2026:88229

mod_ldapRocky

Fixed in:0:2.4.63-13.el10_2.8RHSA-2026:89860

Fixed in:0:2.4.62-13.el9_8.9RHSA-2026:88229

mod_ldap-debuginfoRed Hat / RHEL

Fixed in:0:2.4.63-13.el10_2.8RHSA-2026:89860

Fixed in:0:2.4.62-13.el9_8.9RHSA-2026:88229

mod_ldap-debuginfoRocky

Fixed in:0:2.4.63-13.el10_2.8RHSA-2026:89860

Fixed in:0:2.4.62-13.el9_8.9RHSA-2026:88229

mod_luaRed Hat / RHEL

Fixed in:0:2.4.63-13.el10_2.8RHSA-2026:89860

Fixed in:0:2.4.62-13.el9_8.9RHSA-2026:88229

mod_luaRocky

Fixed in:0:2.4.63-13.el10_2.8RHSA-2026:89860

Fixed in:0:2.4.62-13.el9_8.9RHSA-2026:88229

mod_lua-debuginfoRed Hat / RHEL

Fixed in:0:2.4.63-13.el10_2.8RHSA-2026:89860

Fixed in:0:2.4.62-13.el9_8.9RHSA-2026:88229

mod_lua-debuginfoRocky

Fixed in:0:2.4.63-13.el10_2.8RHSA-2026:89860

Fixed in:0:2.4.62-13.el9_8.9RHSA-2026:88229

mod_proxy_htmlRocky

Fixed in:1:2.4.63-13.el10_2.8RHSA-2026:89860

Fixed in:1:2.4.62-13.el9_8.9RHSA-2026:88229

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

ConfidentialityLow

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

0.43%probability of exploitation in 30 days

38thpercentile

Low risk: more likely to be exploited than 38% of all known CVEs.

References

Vendor Advisory1

httpd.apache.org

Third-Party Advisory1

openwall.com

Related Vulnerabilities

Other CWE-444 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2022-22536	Critical	10.0	98%	KEV	-
CVE-2025-61884	High	7.5	96%	KEV + Ransom	-
CVE-2020-9490	High	7.5	89%	-	Fix
CVE-2023-41265	Critical	9.6	88%	KEV + Ransom	-
CVE-2023-25690	Critical	9.8	85%	-	Fix
CVE-2022-32214	Medium	6.5	82%	-	Fix

Common questions

How do I fix CVE-2026-63718?

Published advisories record a fix for 59 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-2026-63718 being actively exploited?

Not that we know of. CVE-2026-63718 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.43% is the estimated probability that it will be exploited in the next 30 days. That is higher than 38% of all scored CVEs.

How severe is CVE-2026-63718?

CVE-2026-63718 has a CVSS v3 base score of 8.2, 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-2026-63718 affect?

Published advisories record a fix for apache2 (Debian), httpd (Rocky), httpd (Red Hat / RHEL), httpd-core (Red Hat / RHEL), and 55 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

Embed a live status badge for CVE-2026-63718

Markdown

[![CVE-2026-63718](https://tridentstack.com/cve/badge/CVE-2026-63718.svg)](https://tridentstack.com/cve/CVE-2026-63718)

HTML

<a href="https://tridentstack.com/cve/CVE-2026-63718"><img src="https://tridentstack.com/cve/badge/CVE-2026-63718.svg" alt="CVE-2026-63718"></a>

Check your Linux endpoints for this class of vulnerability

TridentStack Control continuously scans Linux endpoints for known vulnerabilities and deploys the fixes from the same console. 200 endpoints free forever, no credit card.

Patch your fleet free Start freeThis CVE lookup is free and always will be.

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 2026-10-06.