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CVE-2026-42245

📛 CVE Title

net-imap: Quadratic complexity when reading response literals

⬇ Download JSON ⚠ View as Threat

Description

Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0.4.24, 0.5.14, and 0.6.4, Net::IMAP::ResponseReader has quadratic time complexity when reading large responses containing many string literals. A hostile server can send responses which are crafted to exhaust the client's CPU for a denial of service attack. This issue has been patched in versions 0.4.24, 0.5.14, and 0.6.4.

Overview

State
PUBLISHED
Assigner (CNA)
GitHub_M
CVSS severity
LOW
CVSS score
CVSS 2.3 / 10 2.3 2.3 / 10
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Effective score
2.3 / 10 LOW source: CNA overview
CWE(s)
CWE-407
Reserved
2026-04-25
Published
2026-05-09 21:37 UTC
Last updated
2026-05-12 20:30 UTC
Source
https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/42xxx/CVE-2026-42245.json
Linked Threat
CVE-2026-42245 — CVE-2026-42245

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published
2026-05-09 20:16:28 UTC
NVD last modified
2026-05-18 18:12:26 UTC
NVD CVSS v3.1
CVSS 7.5 / 10 7.5 7.5 / 10 HIGH source: nvd@nist.gov
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Exploitability subscore
3.9 / 10
Impact subscore
3.6 / 10
EPSS score
0.0009 (probability of exploitation in next 30 days)
EPSS percentile
24.59% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24

NVD / KEV / EPSS data refreshed 2026-05-25 09:37 UTC. Re-run the 🛰 Backfill from NVD button above to refresh.

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID
EUVD-2026-28923
Assigner
GitHub_M
Published
May 9, 2026, 7:37:08 PM
Updated
May 12, 2026, 6:30:58 PM
EUVD base score (CVSS 4.0)
2.3 / 10
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
EUVD-reported EPSS
0.0900
Vendors
Ruby
Products
net-imap (0.6.0, < 0.6.4)
net-imap (< 0.4.24)
net-imap (0.5.0, < 0.5.14)
Aliases
GHSA-q2mw-fvj9-vvcw

ENISA description: Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0.4.24, 0.5.14, and 0.6.4, Net::IMAP::ResponseReader has quadratic time complexity when reading large responses containing many string literals. A hostile server can send responses which are crafted to exhaust the client's CPU for a denial of service attack. This issue has been patched in versions 0.4.24, 0.5.14, and 0.6.4.

EUVD references (7)

Affected products (1)
VendorProductVersionsPlatforms
ruby net-imap < 0.4.24 (affected), >= 0.5.0, < 0.5.14 (affected), >= 0.6.0, < 0.6.4 (affected) —

Affected products — CPE 2.3 (1) NVD

NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.

  • cpe:2.3:a:ruby-lang:net\:\:imap:*:*:*:*:*:ruby:*:*

Vendor references (7)

References embedded in the original CVE record by the assigning CNA.

MITRE references (7) cveawg.mitre.org

Pulled from MITRE's CVE Services API by the 🛰 Backfill from MITRE button.

Web references (3)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

NVD-tagged references (7)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

Remediations (17)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

  • Microsoft Releases Mitigation for Windows BitLocker Security Bypass 0 ...
    web:cybersecuritynews.com

    No patch has been released yet; Microsoft has instead issued a multi-step manual mitigation guide while a formal security update is prepared. Windows BitLocker Security Bypass The vulnerability originates in WinRE's handling of the BootExecute registry value under HKLM\ControlSet001\Control\Session Manager.

    2026-05-23 21:03 UTC
  • Security Update Guide - Microsoft
    web:portal.msrc.microsoft.com

    The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.

    2026-05-23 21:03 UTC
  • Microsoft April 2026 Patch Tuesday fixes 167 flaws, 2 zero-days
    web:www.bleepingcomputer.com

    Today is Microsoft's April 2026 Patch Tuesday with security updates for 167 flaws, including 2 zero-day vulnerabilities.

    2026-05-23 21:03 UTC
  • April 2026 Patch Tuesday: Updates and Analysis | CrowdStrike
    web:www.crowdstrike.com

    Microsoft's April 2026 Patch Tuesday addresses 164 CVEs , featuring 8 Critical vulnerabilities, one exploited zero-day, and one disclosed zero-day.

    2026-05-23 21:03 UTC
  • CVE: Common Vulnerabilities and Exposures
    web:www.cve.org

    At cve .org, we provide the authoritative reference method for publicly known information-security vulnerabilities and exposures

    2026-05-23 21:03 UTC
  • Microsoft Technical Security Notifications
    web:www.microsoft.com

    Security Update Guide Notifications Microsoft's free Security Update Guide Notifications provide links to security-related software updates and notification of re-released security updates. These notifications are sent via email throughout the month as needed.

    2026-05-23 21:03 UTC
  • Microsoft mitigates YellowKey BitLocker bypass, no patch yet
    web:www.notebookcheck.net

    Microsoft released mitigation steps for YellowKey ( CVE - 2026 -45585), a BitLocker bypass that grants physical attackers access to encrypted Windows drives.

    2026-05-23 21:03 UTC
  • Microsoft Issues Massive Windows Patch for 160+ Bugs ... - TechRepublic
    web:www.techrepublic.com

    Microsoft's April 2026 Patch Tuesday fixes 165 vulnerabilities, including two zero-days, in one of the company's largest monthly security updates.

    2026-05-23 21:03 UTC
  • Microsoft KB5034441 Windows 10 security patch for BitLocker bypass is ...
    web:www.tomshardware.com

    Microsoft released security update KB5034441 on Patch Tuesday to fix a BitLocker encryption bypass vulnerability affecting Windows 10 users. However, some users are experiencing an update failure ...

    2026-05-23 21:03 UTC
  • Patch Tuesday May 2026: Security Updates & CVE Analysis
    web:zecurit.com

    Get the complete breakdown of Microsoft's May 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .

    2026-05-23 21:03 UTC
  • Microsoft Issues Second Biggest Patch Tuesday Ever in April
    web:redmondmag.com

    Microsoft April 2026 Patch Tuesday fixed 163 CVEs , marking its second-largest security update. Three zero-day vulnerabilities impacted SharePoint, Chromium-based Edge workflows and Microsoft Defender.

    2026-05-26 02:50 UTC
  • Google Translate
    web:translate.google.com

    Google's service, offered free of charge, instantly translates words, phrases, and web pages between English and over 100 other languages.

    2026-05-26 02:50 UTC
  • Known Exploited Vulnerabilities Catalog - CISA
    web:www.cisa.gov

    For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild. Organizations should use the KEV catalog as an input to their vulnerability management prioritization framework.

    2026-05-26 02:50 UTC
  • Microsoft is working on a patch for 'YellowKey ... - Computerworld
    web:www.computerworld.com

    Microsoft says it is considering a patch for a zero-day vulnerability, dubbed YellowKey, that allows attackers with access to a Windows device to bypass Bitlocker encryption protection and read ...

    2026-05-26 02:50 UTC
  • April 2025 Patch Tuesday: Updates and Analysis | CrowdStrike
    web:www.crowdstrike.com

    Microsoft has released security updates for 121 vulnerabilities, including one actively exploited zero-day and 11 critical, in its April 2025 Patch Tuesday rollout.

    2026-05-26 02:50 UTC
  • Microsoft Patch Tuesday - November 2025 - Lansweeper
    web:www.lansweeper.com

    Which vulnerabilities, issues, and other things did Microsoft update? Discover what's new using Lansweeper's Patch Tuesday November 2025 summary.

    2026-05-26 02:50 UTC
  • Vulnerability Remediation vs. Mitigation: What are the Differences ...
    web:www.secure.com

    Learn the difference between vulnerability remediation and mitigation , and how a risk-based strategy can strengthen your security posture.

    2026-05-26 02:50 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-42245.json.

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