Vulnerability · Published Oct 24, 2026 · Assigned by CPANSec
CVE-2026-114629Web::Simple versions before 0.035 for Perl allocate a buffer sized by the Content-Length header for urlencoded body parameters
High 7.5
In plain English
A high-severity security flaw in Web-Simple. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Web::Simple versions before 0.035 for Perl allocate a buffer sized by the Content-Length header for urlencoded body parameters. Web::Dispatch::ParamParser::get_unpacked_body_from reads an application/x-www-form-urlencoded body using a single read call, with no cap and the return value ignored. Perl's read grows the buffer to the requested length before reading, so the declared Content-Length determines the allocation. An attacker can trigger this through any route whose dispatch specification has a % body-parameter match, such as sub (POST + %name=), sending a Content-Length far larger than the body actually sent. No authentication is involved.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | libweb-simple-perl | no fix listed | DEBIAN-CVE-2026-114629 |
| Debian:13 | libweb-simple-perl | no fix listed | DEBIAN-CVE-2026-114629 |
| Debian:14 | libweb-simple-perl | 0.035-1 | DEBIAN-CVE-2026-114629 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Web-Simple | 0 – before 0.035 |
Weakness: CWE-789 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N