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CVE-2026-19566— Net::CIDR::Set versions before 0.23 for Perl allow memory exhaustion and malformed set ranges via unbounded IPv6 prefix lengths

Quick assessment

Affected
RRWO Net::CIDR::Set
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.

RRWO Net::CIDR::Set是RRWO个人开发者的一款网络地址集合处理模块 RRWO Net::CIDR::Set 0.23之前版本存在安全漏洞，该漏洞源于对IPv6前缀长度缺乏限制，可能导致内存耗尽和畸形集合范围。

AI Predicted 5.3 Difficulty: Easy EPSS 0.63% · P48

Affected Version Matrix 1

VendorProduct Version RangeStatus
RRWO Net::CIDR::Set < 0.23 affected
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I. Basic Information for CVE-2026-19566

Vulnerability Information
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Vulnerability Title
Net::CIDR::Set versions before 0.23 for Perl allow memory exhaustion and malformed set ranges via unbounded IPv6 prefix lengths
Source: CVE Program / CVE List V5
Vulnerability Description
Net::CIDR::Set versions before 0.23 for Perl allow memory exhaustion and malformed set ranges via unbounded IPv6 prefix lengths. The _encode method accepts any prefix length matching `(0|[1-9][0-9]*)` and passes it to _width2bits(), which builds the mask as `'1' x ($width + 8)`, one character per bit. The _inc() method then unpacks the packed mask into a Perl array of one scalar per byte, so the prefix length alone sets the allocation size: `::/100000000` builds a 100 MB string and a 12.5 million element array. The value being tested is parsed, not just the configured ranges: contains() builds a set from its argument, and _guess_coder() tries the IPv4 coder and then the IPv6 coder, so an IPv4-only set expands an oversized IPv6 prefix length before the mixed address width check rejects it. Any caller that passes untrusted input to contains() or add() can exhaust process memory. A prefix length above 128 is also stored as a range that does not match the requested block: 2001:db8::/129 stringifies back unchanged, contains() of its own base address returns false, and removing it from a set drops the base address while the set still prints as covering it.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1284
Source: CVE Program / CVE List V5
Vulnerability Title
RRWO Net::CIDR::Set 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
RRWO Net::CIDR::Set是RRWO个人开发者的一款网络地址集合处理模块 RRWO Net::CIDR::Set 0.23之前版本存在安全漏洞，该漏洞源于对IPv6前缀长度缺乏限制，可能导致内存耗尽和畸形集合范围。
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
RRWO Net::CIDR::Set 0 ~ 0.23 -

II. Public POCs for CVE-2026-19566

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III. Intelligence Information for CVE-2026-19566

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Patches & Fixes for CVE-2026-19566 (1)

Vendor Advisories for CVE-2026-19566 (1)

News Coverage for CVE-2026-19566 (1)

Other References for CVE-2026-19566 (1)

IV. Related Vulnerabilities

Same product: Net::CIDR::Set
Same vendor: RRWO
Same weakness: CWE-1284

V. Comments for CVE-2026-19566

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