Perl up to 5.43.10 S_measure_struct repeat integer overflow

Summaryinfo

A vulnerability was found in Perl up to 5.43.10. It has been rated as problematic. Impacted is an unknown function of the component S_measure_struct. The manipulation of the argument repeat leads to integer overflow. This vulnerability is traded as CVE-2026-57432. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Perl up to 5.43.10. This issue affects an unknown function of the component S_measure_struct. The manipulation of the argument repeat with an unknown input leads to a integer overflow vulnerability. Using CWE to declare the problem leads to CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. Impacted is confidentiality. The summary by CVE is:

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.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-57432 since 06/24/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/13/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Programming Language Software

Name

• Perl

Version

• 5.43.0
• 5.43.1
• 5.43.2
• 5.43.3
• 5.43.4
• 5.43.5
• 5.43.6
• 5.43.7
• 5.43.8
• 5.43.9
• 5.43.10

License

• open-source

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