CVE intelligence

CVE-2026-57433

Vulnerability intelligence

Published Jul 13, 2026Sources checked Oct 27, 2026

9.8CRITICALCVSS out of 10

What this means

Review the available evidence

CVE-2026-57433 and is rated Critical severity with a CVSS score of 9.8. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.

What to do next

Remediation and response

Ubuntu Security Notices guidance

Vendor revision: Sep 9, 2026

USN-8675-1 fixed vulnerabilities in Perl.

Ubuntu Security Notices guidance

Vendor revision: Aug 25, 2026

(CVE-2026-12087) It was discovered that Perl incorrectly handled regular expressions containing a large number of fixed string alternatives.

Microsoft Security Response Center guidance

Vendor revision: Jul 21, 2026

CBL-Mariner Releases

Vendor-listed releases

5.38.2-514

CISA KEVNot listedBased on the latest collected catalog

EPSS0.5%Estimated 30-day exploitation probability

Ransomware useNot markedCISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is CVE-2026-57433?

Storable versions before 3.41 for Perl have a signed integer overflow when deserializing a crafted SX_HOOK record.

retrieve_hook_common reads a signed 32-bit item count from an SX_HOOK record and calls av_extend with that count plus one. A count of I32_MAX wraps the addition to a negative value.

A crafted blob passed to thaw or retrieve triggers the overflow; av_extend receives the negative count and dies with a panic, terminating the deserialization.

Source: NVD