VulnSocial

CVE-2026-45191General

LOWCVSS 6.5 · MEDIUM

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

Net::CIDR::Lite versions before 0.24 for Perl does not properly consider extraneous zero characters in CIDR mask values, which may allow IP ACL bypass. Mask forms like "/00" and "/01" pass validation and parse to the same prefix as their unpadded value. See also CVE-2026-45190.

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0.0/ 10 priority

Sources & remediation

Other references
Weakness type (CWE)
CWE-1289

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

STABLE

Threat summary

  • 2 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • Technical details provided in 2 signals
  • General: 1 classified signal
  • Disclosure: 1 classified signal
  • Peaked 1d ago at 1 mentions (2026-05-10); latest day: 1
  • 2 total mentions across 2 days

Deep dive

Activity timeline2 mentions / 2d
00111Mentions · 2026-05-10: 1Mentions · 2026-05-15: 1Technical Details · 2026-05-10: 1Technical Details · 2026-05-15: 105-1005-15
Signal classification2 categories
General
150.0%
Disclosure
150.0%
Referenced assets4 URLs
Classification over time
DateTotalLabels
2026-05-101
General1
2026-05-151
Disclosure1
Full discourse2 posts
  • Open Source Security mailing list@oss_security
    Disclosure

    Perl CPAN: CVE-2026-45190: Net::CIDR::Lite before 0.24 does not properly validate IP address and CIDR mask inputs, which may allow IP ACL bypass https://www.openwall.com/lists/oss-security/2026/05/10/6 CVE-2026-45191: ditto with extraneous zero characters in CIDR mask values https://www.openwall.com/lists/oss-security/2026/05/10/7

    Post summary

    Two CVEs (2026‑45190 & 2026‑45191) affecting Net::CIDR::Lite have been disclosed, noting that improper input validation can allow IP ACL bypass and issues with extraneous zeros in CIDR masks.

    10000119
    4.6K followersView on X
  • Vulmon Vulnerability Feed@VulmonFeeds
    General

    CVE-2026-45191 IP ACL Bypass via Improper CIDR Mask Validation in Net::CIDR::Lit... https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-45191 Customizable Vulnerability Alerts: https://alerts.vulmon.com/?utm_source=twitter&utm_medium=social&utm_campaign=2102281&utm_content=4

    Post summary

    A brief notice about CVE‑2026‑45191, describing an ACL bypass due to improper CIDR mask validation, with a link to a vulnerability detail page but no PoC, exploit, or patch information.

    0000064
    4.0K followersView on X

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