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A low-severity vulnerability in Apache HTTP Server affects versions 2.4.0 through 2.4.65. The flaw occurs in CGI environment handling, where environment variables set through Apache configuration can unexpectedly supersede environment variables that the server itself calculates for CGI programs. Apache classifies the issue as improper neutralization of escape, meta, or control sequences. In affected deployments, this can alter the execution environment presented to CGI scripts and may cause CGI programs to operate on attacker-influenced or incorrectly prioritized variable values rather than trusted server-derived values.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
19 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability affecting IBM HTTP Server configurations with mod_cgi or mod_cgid loaded and .htaccess enabled above the CGI root.
An Oracle HTTP Server Core vulnerability associated with Apache HTTP Server, identified in the April 2026 CPU as remotely exploitable without authentication.
An Apache open source vulnerability affecting Apple software on macOS Sequoia.
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.
Community discussion across Reddit, Mastodon, and other social sources.