High [CVE-2026-63686] Denial of Service via charset conversion failure in mod_xml2enc
This high-severity Red Hat Linux advisory covers CVE-2026-63686; related products: Red Hat Hardened Images, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6.
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Summary
Denial of Service via charset conversion failure in mod_xml2enc. Red Hat rates this important (CVSS 7.5).
Weakness: CWE-476. Red Hat lists fixing advisory RHSA-2026:74858 with package httpd-main-2.4.69-1.hum1.
Affected products named by the advisory: Red Hat Hardened Images; Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; and 3 more.
Affected products named by the advisory: Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat package: httpd.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 4 days ago·verify at source
- httpd-main-2.4.69-1.hum1
- RHSA-2026:74858
Official advisory · high-confidence parse· fetched 4 days ago·verify at source
Mitigation checklist
- If proxy character set transcoding is not required, disable the mod_xml2enc module by commenting out its configuration directive. 1. Edit the module configuration file (typically located under `/etc/httpd/conf.modules.d/`) and comment out the loading directive: # LoadModule xml2enc_module modules/mod_xml2enc.so 2. Verify the configuration syntax: httpd -t 3. Reload the Apache HTTP Server to apply changes: systemctl reload httpd Caveats: Disabling mod_xml2enc will break modules that depend on XML or HTML character set conversion, such as mod_proxy_html. If this module is required, restrict proxy rules so httpd communicates only with trusted upstream backends. Warning: Reloading or restarting the httpd service may cause a brief interruption to active connections.
Official advisory · high-confidence parse· fetched 4 days ago·verify at source
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