Heap-memory disclosure via pack template integer overflow
Published Jul 13, 2026 · Updated Jul 13, 2026
Out-of-bounds read in Perl 5.43.10 and earlier allows attackers to read heap memory via an attacker-controlled pack or unpack template. S_measure_struct multiplies item size by an unchecked repeat count, wraps its signed total negative, and lets position-code bounds checks advance past the buffer. Exploitation requires an application to use attacker-controlled template data; typical hardcoded templates do not expose the read.
Summary
What happened
Out-of-bounds read in Perl 5.43.10 and earlier allows attackers to read heap memory via an attacker-controlled pack or unpack template. S_measure_struct multiplies item size by an unchecked repeat count, wraps its signed total negative, and lets position-code bounds checks advance past the buffer. Exploitation requires an application to use attacker-controlled template data; typical hardcoded templates do not expose the read.
The record
- CVE
- CVE-2026-57432
- Published
- Jul 13, 2026
- Updated
- Jul 13, 2026
- Vendor
- The Perl Foundation
- Product
- Perl
- Classifications
- CWE-190, CWE-125, T1005
- Attack vector
- local
- Privileges
- Unavailable
Timeline
How it unfolded
- Jul 13, 2026CVE publishedPublication date reported by the CVE source.
- Jul 13, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <=5.43.10
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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