/ 
perl-5.29.4
⭐ Starred 2013
/ ext/B/t/optree_constants.t
Security Advisories (3)
CVE-2023-47100

In Perl before 5.38.2, S_parse_uniprop_string in regcomp.c can write to unallocated space because a property name associated with a \p{...} regular expression construct is mishandled. The earliest affected version is 5.30.0.

CVE-2023-47039 (2023-10-30)

Perl for Windows relies on the system path environment variable to find the shell (cmd.exe). When running an executable which uses Windows Perl interpreter, Perl attempts to find and execute cmd.exe within the operating system. However, due to path search order issues, Perl initially looks for cmd.exe in the current working directory. An attacker with limited privileges can exploit this behavior by placing cmd.exe in locations with weak permissions, such as C:\ProgramData. By doing so, when an administrator attempts to use this executable from these compromised locations, arbitrary code can be executed.

CVE-2025-40909 (2025-05-30)

Perl threads have a working directory race condition where file operations may target unintended paths. If a directory handle is open at thread creation, the process-wide current working directory is temporarily changed in order to clone that handle for the new thread, which is visible from any third (or more) thread already running. This may lead to unintended operations such as loading code or accessing files from unexpected locations, which a local attacker may be able to exploit. The bug was introduced in commit 11a11ecf4bea72b17d250cfb43c897be1341861e and released in Perl version 5.13.6

Optimized constant subs are stored as bare scalars in the stash (package hash), which formerly held only GVs (typeglobs).

But you cant create them manually - you cant assign a scalar to a stash element, and expect it to work like a constant-sub, even if you provide a prototype.

This is a feature; alternative is too much action-at-a-distance. The following test demonstrates - napier is not seen as a function at all, much less an optimized one.

1 POD Error

The following errors were encountered while parsing the POD:

Around line 392:

Unknown directive: =head