Bug#1142036: perl: CVE-2026-57432

[Salvatore Bonaccorso]

Source: perl
Version: 5.40.1-8
Severity: important
Tags: security upstream
X-Debbugs-Cc: carnil at debian.org, Debian Security Team <team at security.debian.org>

Hi,

The following vulnerability was published for perl.

CVE-2026-57432[0]:
| Perl versions through 5.43.10 have an integer overflow in
| S_measure_struct leading to an out-of-bounds heap read in pack and
| unpack.  S_measure_struct adds each item's size times its repeat
| count to a running total with no overflow check, so a large repeat
| count in a pack or unpack template wraps the signed SSize_t total
| negative. The @, X, and x position codes then guard their moves with
| a signed length comparison that passes when the length is negative,
| advancing the buffer pointer out of bounds.  A template derived from
| untrusted input can read heap memory past the buffer and return it
| to the caller.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-57432
    https://www.cve.org/CVERecord?id=CVE-2026-57432
[1] https://lists.security.metacpan.org/cve-announce/msg/41780102/

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore