libcgi-simple-perl: CGI::Simple versions before 1.282 for Perl has a HTTP response splitting flaw This vulnerability is a confirmed HTTP...
CVE-2025-40927 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2025-40927, released August 29, 2025. It is not reported as exploited. Patch Radar priority: High.
CGI::Simple versions before 1.282 for Perl has a HTTP response splitting flaw This vulnerability is a confirmed HTTP response splitting flaw in CGI::Simple that allows HTTP response header injection, which can be used for reflected XSS or open redirect under certain conditions. Although some validation exists, it can be bypassed using URL-encoded values, allowing an attacker to inject untrusted content into the response via query parameters. As a result, an attacker can inject a line break (e.g. %0A) into the parameter value, causing the server to split the HTTP response and inject arbitrary headers or even an HTML/JavaScript body, leading to reflected cross-site scripting (XSS), open redirect or other attacks. The issue documented in CVE-2010-4410 https://www.cve.org/CVERecord?id=CVE-2010-4410 is related but the fix was incomplete. Impact By injecting %0A (newline) into a query string parameter, an attacker can: * Break the current HTTP header * Inject a new header or entire body * Deliver a script payload that is reflected in the server’s response That can lead to the following attacks: * reflected XSS * open redirect * cache poisoning * header manipulation
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libcgi-simple-perl · Debian 12.15 (bookworm) | 1.280-2+deb12u1 | DEBIAN-CVE-2025-40927 | Aug 29, 2025 |
| libcgi-simple-perl · Debian 13.5 (trixie) | 1.282-1~deb13u1 | DEBIAN-CVE-2025-40927 | Aug 29, 2025 |
| libcgi-simple-perl · Debian 14 | 1.282-1 | DEBIAN-CVE-2025-40927 | Aug 29, 2025 |
| perl-CGI-Simple · Fedora 43 | 1:1.282-1.fc43 | FEDORA-2025-3DD97ED203 | Dec 2, 2025 |
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