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CVE-2026-57432— Perl versions before 5.40.5-RC1, from 5.41.0 before 5.42.3-RC1, from 5.43.0 before 5.43.11 have an integer overflow in S_measure_struct leading to an out-of-bounds heap read in pack and unpack

Quick assessment

Affected
CVE-2026-57432
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

SHAY perl是SHAY的编程语言解释器。 SHAY perl 5.43.10及之前版本存在安全漏洞，该漏洞源于S_measure_struct函数中存在整数溢出，导致在pack和unpack操作中发生越界堆读取，可能读取缓冲区后的堆内存并返回给调用者。

AI Predicted 8.8 Difficulty: Easy EPSS 0.21% · P10

Affected Version Matrix 3

VendorProduct Version RangeStatus
None None < 5.40.5-RC1 affected
5.41.0< 5.42.3-RC1 affected
5.43.0< 5.43.11 affected

I. Basic Information for CVE-2026-57432

Vulnerability Information
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Vulnerability Title
Perl versions before 5.40.5-RC1, from 5.41.0 before 5.42.3-RC1, from 5.43.0 before 5.43.11 have an integer overflow in S_measure_struct leading to an out-of-bounds heap read in pack and unpack
Source: CVE Program / CVE List V5
Vulnerability Description
Perl versions before 5.40.5-RC1, from 5.41.0 before 5.42.3-RC1, from 5.43.0 before 5.43.11 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5
Vulnerability Title
SHAY perl 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SHAY perl是SHAY的编程语言解释器。 SHAY perl 5.43.10及之前版本存在安全漏洞，该漏洞源于S_measure_struct函数中存在整数溢出，导致在pack和unpack操作中发生越界堆读取，可能读取缓冲区后的堆内存并返回给调用者。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
- - 0 ~ 5.40.5-RC1 -

II. Public POCs for CVE-2026-57432

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III. Intelligence Information for CVE-2026-57432

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Patches & Fixes for CVE-2026-57432 (2)

IV. Related Vulnerabilities

Same weakness: CWE-190

V. Comments for CVE-2026-57432

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