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CVE-2026-65066— Data::RingBuffer::Shared versions before 0.04 for Perl create a world-readable mmap backing file and open it without O_EXCL or O_NOFOLLOW

Quick assessment

Affected
EGOR Data::RingBuffer::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::RingBuffer::Shared是EGOR个人开发者开源的一个数据循环缓冲共享模块。 EGOR Data::RingBuffer::Shared 0.04之前版本存在安全漏洞，该漏洞源于创建了全局可读的mmap备份文件，且打开该文件时未使用O_EXCL或O_NOFOLLOW标志，可能导致本地攻击者利用预置文件或符号链接赢得预创建竞赛或重定向打开操作。

AI Predicted 5.9 Difficulty: Moderate EPSS 0.14% · P4

Affected Version Matrix 1

VendorProduct Version RangeStatus
EGOR Data::RingBuffer::Shared < 0.04 affected
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I. Basic Information for CVE-2026-65066

Vulnerability Information
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Vulnerability Title
Data::RingBuffer::Shared versions before 0.04 for Perl create a world-readable mmap backing file and open it without O_EXCL or O_NOFOLLOW
Source: CVE Program / CVE List V5
Vulnerability Description
Data::RingBuffer::Shared versions before 0.04 for Perl create a world-readable mmap backing file and open it without O_EXCL or O_NOFOLLOW. The segment is created in ring.h with open(path, O_RDWR|O_CREAT, 0666). The mode is 0666, so under the default umask 022 the file is created mode 0644 (world-readable). O_NOFOLLOW is absent, so a symlink planted at the path is followed, and O_EXCL is absent, so the open silently uses a pre-planted file instead of failing. 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 file or symlink at the path lets a local attacker win a pre-creation race or redirect the open.
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::RingBuffer::Shared 后置链接漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
EGOR Data::RingBuffer::Shared是EGOR个人开发者开源的一个数据循环缓冲共享模块。 EGOR Data::RingBuffer::Shared 0.04之前版本存在安全漏洞，该漏洞源于创建了全局可读的mmap备份文件，且打开该文件时未使用O_EXCL或O_NOFOLLOW标志，可能导致本地攻击者利用预置文件或符号链接赢得预创建竞赛或重定向打开操作。
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::RingBuffer::Shared 0 ~ 0.04 -

II. Public POCs for CVE-2026-65066

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III. Intelligence Information for CVE-2026-65066

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Patches & Fixes for CVE-2026-65066 (1)

Vendor Pages for CVE-2026-65066 (1)

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

CVE-2026-59145 Data::Intern::Shared versions before 0.02 for Perl allow an out-of-bounds read via unvalid
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-2026-65063 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-2026-59143 Data::RoaringBitmap::Shared versions before 0.02 for Perl allow an out-of-bounds read via
CVE-2026-59140 Data::SortedSet::Shared versions before 0.03 for Perl allow an out-of-bounds read via unva
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-2026-64613 Data::Buffer::Shared versions before 0.05 for Perl create a world-readable mmap backing fi
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 product: Data::RingBuffer::Shared
Same vendor: EGOR
Same weakness: CWE-732