Bug#1142036: perl: CVE-2026-57432

[Niko Tyni]

Control: unarchive 1138905
Control: retitle 1138905 perl: CVE-2026-57432: integer overflow in S_measure_struct
Control: forcemerge 1138905 -1

On Tue, Jul 14, 2026 at 08:51:35AM +0200, Salvatore Bonaccorso wrote:
> 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.

This is #1138905, already fixed in testing/unstable (but not in stable
so far.)

So merging.
-- 
Niko