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CVE-2026-42356 is a wrong-handler deployment vulnerability affecting Apache HTTP Server 2.4.60 through 2.4.68. Handler-selection logic can retain the CGI handler following certain internal redirects issued by CGI programs, causing the destination file to be treated as CGI and executed. The destination must already reside in a CGI-enabled directory and have no other extension recognized by mod_mime. These prerequisites constrain the unintended code-execution capability.
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Incorrect handler assignment during internal CGI redirects in Apache HTTP Server can permit arbitrary code execution. The reference lists this vulnerability among issues addressed by httpd 2.4.69; the Fedora 43 update is pending testing.
Incorrect handler assignment during internal CGI redirects in Apache HTTP Server can allow arbitrary code execution. The advisory includes a fix in httpd 2.4.69; the Fedora package is pending testing.
Incorrect handler assignment during internal CGI redirects in Apache HTTP Server can allow arbitrary code execution. The issue is addressed by the httpd 2.4.69 update pending Fedora testing.
Incorrect handler assignment can cause internal redirect targets from CGI programs to execute as CGI. The target must be in a CGI-enabled directory and have no other extension understood by mod_mime. Affects Apache HTTP Server 2.4.60 through 2.4.68.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
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