#1142036 perl: CVE-2026-57432

Package:
perl
Source:
perl
Description:
Larry Wall's Practical Extraction and Report Language
Submitter:
Salvatore Bonaccorso
Date:
2026-07-14 20:01:01 UTC
Severity:
normal
Tags:
#1142036#5
Date:
2026-07-14 06:51:35 UTC
From:
To:
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
#1142036#10
Date:
2026-07-14 08:11:19 UTC
From:
To:
Control: unarchive 1138905
Control: retitle 1138905 perl: CVE-2026-57432: integer overflow in S_measure_struct
Control: forcemerge 1138905 -1

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

So merging.
#1142036#35
Date:
2026-07-14 19:59:05 UTC
From:
To:
Hi Niko,

Samewise here, sorry for that.

Regards,
Salvatore