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CVE-2026-64613— Data::Buffer::Shared versions before 0.05 for Perl create a world-readable mmap backing file and open it without O_NOFOLLOW

Quick assessment

Affected
EGOR Data::Buffer::Shared
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.

EGOR Data::Buffer::Shared是EGOR个人开发者的一个共享数据缓冲模块。 EGOR Data::Buffer::Shared 0.05之前版本存在安全漏洞，该漏洞源于在buf_generic.h中创建世界可读的mmap后备文件且未使用O_NOFOLLOW打开，可能导致本地用户读取共享目录中世界可读段的IPC有效载荷，并可能跟随预植入的符号链接重定向打开到其他文件。

AI Predicted 7.8 Difficulty: Easy EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1552.004 · Private Keys

Affected Version Matrix 1

VendorProduct Version RangeStatus
EGOR Data::Buffer::Shared < 0.05 affected
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I. Basic Information for CVE-2026-64613

Vulnerability Information
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Vulnerability Title
Data::Buffer::Shared versions before 0.05 for Perl create a world-readable mmap backing file and open it without O_NOFOLLOW
Source: CVE Program / CVE List V5
Vulnerability Description
Data::Buffer::Shared versions before 0.05 for Perl create a world-readable mmap backing file and open it without O_NOFOLLOW. The segment is created in buf_generic.h with open(path, O_RDWR|O_CREAT|O_EXCL, 0666). O_EXCL blocks a pre-seeded file on create, but the mode is 0666, so under the default umask 022 the file is created mode 0644 (world-readable), and O_NOFOLLOW is absent, so a symlink planted at the path is followed when the segment is attached. A "Shared" segment naturally lives in a shared directory such as /tmp or /dev/shm, where any local user can read the IPC payloads stored in the world-readable segment, and a pre-planted symlink at the path redirects the open to another file.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
关键资源的不正确权限授予
Source: CVE Program / CVE List V5
Vulnerability Title
EGOR Data::Buffer::Shared 后置链接漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
EGOR Data::Buffer::Shared是EGOR个人开发者的一个共享数据缓冲模块。 EGOR Data::Buffer::Shared 0.05之前版本存在安全漏洞，该漏洞源于在buf_generic.h中创建世界可读的mmap后备文件且未使用O_NOFOLLOW打开，可能导致本地用户读取共享目录中世界可读段的IPC有效载荷，并可能跟随预植入的符号链接重定向打开到其他文件。
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
EGOR Data::Buffer::Shared 0 ~ 0.05 -

II. Public POCs for CVE-2026-64613

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III. Intelligence Information for CVE-2026-64613

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Patches & Fixes for CVE-2026-64613 (1)

Vendor Advisories for CVE-2026-64613 (1)

Same Patch Batch · EGOR · 2026-07-21 · 23 CVEs total

CVE-2026-59143 Data::RoaringBitmap::Shared versions before 0.02 for Perl allow an out-of-bounds read via
CVE-2026-65068 Data::SpatialHash::Shared versions before 0.02 for Perl create a world-readable mmap backi
CVE-2026-65062 Data::SortedSet::Shared versions before 0.03 for Perl create a world-readable mmap backing
CVE-2026-65065 Data::RoaringBitmap::Shared versions before 0.02 for Perl create a world-readable mmap bac
CVE-2026-65069 Data::DisjointSet::Shared versions before 0.02 for Perl create a world-readable mmap backi
CVE-2026-65066 Data::RingBuffer::Shared versions before 0.04 for Perl create a world-readable mmap backin
CVE-2026-65063 Data::RadixTree::Shared versions before 0.02 for Perl create a world-readable mmap backing
CVE-2026-65067 Data::Intern::Shared versions before 0.02 for Perl create a world-readable mmap backing fi
CVE-2026-65064 Data::HashMap::Shared versions before 0.14 for Perl create a world-readable mmap backing f
CVE-2026-65061 Data::ReqRep::Shared versions before 0.05 for Perl create a world-readable mmap backing fi
CVE-2026-59147 Data::DisjointSet::Shared versions before 0.02 for Perl allow out-of-bounds reads and writ
CVE-2026-59140 Data::SortedSet::Shared versions before 0.03 for Perl allow an out-of-bounds read via unva
CVE-2026-59145 Data::Intern::Shared versions before 0.02 for Perl allow an out-of-bounds read via unvalid
CVE-2026-59146 Data::SpatialHash::Shared versions before 0.02 for Perl allow out-of-bounds reads and writ
CVE-2026-59144 Data::RingBuffer::Shared versions before 0.04 for Perl allow a stack buffer overflow via a
CVE-2026-64617 Data::PubSub::Shared versions before 0.07 for Perl create a world-readable mmap backing fi
CVE-2026-64615 Data::Graph::Shared versions before 0.04 for Perl create a world-readable mmap backing fil
CVE-2026-64614 Data::Deque::Shared versions before 0.06 for Perl create a world-readable mmap backing fil
CVE-2026-64616 Data::NDArray::Shared versions before 0.02 for Perl create a world-readable mmap backing f
CVE-2026-59139 Data::ReqRep::Shared versions before 0.05 for Perl allow an out-of-bounds read via an unva

Showing top 20 of 23 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same vendor: EGOR
Same weakness: CWE-732