LIVE · cybersecurity feed
Live wire
CVE-2026-4890high

Dnsmasq DNSSEC Vulnerability Leads to Denial-of-Service

A vulnerability in dnsmasq's DNSSEC NSEC/NSEC3 type bitmap processing can allow remote attackers to cause a denial-of-service condition. Exploitation does not require authentication. The vulnerability has a CVSS score of 7.5.

zeroday.news ·

A critical denial-of-service vulnerability, identified as CVE-2026-4890, has been disclosed in Dnsmasq, a widely used DNS forwarder and DHCP server. The flaw, which received a CVSS score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H), allows remote attackers to trigger an infinite loop by sending specially crafted DNSSEC NSEC/NSEC3 records, leading to a denial-of-service condition.

The vulnerability stems from improper processing of NSEC records, specifically within the NSEC/NSEC3 Type Bitmap, where a lack of a proper exit condition in a loop can be exploited. Attackers do not need to authenticate to leverage this flaw, making it a significant remote attack vector.

The issue was reported to the vendor on May 20, 2026, by a researcher identified as chwrld. A coordinated public release of the advisory occurred on August 13, 2026.

Dnsmasq has confirmed the vulnerability and released a patch in version 2.93. Users of Dnsmasq are strongly advised to update their installations to this version or newer to mitigate the risk of exploitation. The vulnerability is tracked under ZDI-26-584 and ZDI-CAN-30607.

dnsmasqdnssecdenial-of-servicevulnerability
ShareXLinkedInWhatsAppFacebook

More News

view all →
CVE-2026-68820high

17th August – Threat Intelligence Report

Several significant cyber incidents were reported this week, including a ransomware attack on Colombia's Ministry of Justice and a data breach affecting Poland's primary healthcare platform, MyDr, potentially exposing data of 19 million citizens. Additionally, Levi Strauss & Co. and IEH Corporation reported cyberattacks involving social engineering and phishing, respectively, with no consumer data compromised in the former. In the realm of AI threats, researchers detailed a suspected China-linked campaign using autonomous AI agents against Taiwanese government systems and noted North Korea-linked Kimsuky's efforts to build an offline AI environment for cyberespionage. Microsoft, Apple, Adobe

CVE-2026-69414high

ShieldBreak bypasses Microsoft’s patch for earlier Defender flaw

A new vulnerability dubbed ShieldBreak (CVE-2026-69414) has been discovered in Microsoft Defender, which bypasses a previous patch for a similar flaw called RoguePlanet. This elevation of privilege vulnerability requires initial access to a machine and is dependent on Microsoft Defender being active. Microsoft has acknowledged the issue and is working on a fix, advising users to maintain security updates and exercise caution with untrusted code.

CVE-2026-15826critical

WordPress Plugin Flaw Exposes 40,000 Sites to Admin Takeover

A critical vulnerability in the WordPress User Profile Builder plugin, affecting over 40,000 sites, allows unauthenticated attackers to gain administrator access. The flaw, CVE-2026-15826, stems from a type confusion error that can trick the plugin into granting administrative privileges if specific configurations are met, such as the administrator using user ID 1 and automatic login after registration being enabled. The plugin developer has released a patch, version 3.16.5, to address the issue.

ransomware

Philips and GE investigating Clop ransomware data theft claims

Tech giants General Electric (GE) and Philips have also confirmed they're investigating claims that the Clop ransomware gang breached their systems and stole data. [...]

security

Hacking Public Wi-Fi DNS to Steal Credentials

Criminals are hacking into public Wi-Fi devices—at hotels, conference centers, and so on—around the world and changing their DNS settings. The goal is to redirect users to fake login pages and steal their credentials.

security

Fake TikTok rewards promise cash you’ll never get

TikTok-branded rewards pages offer cash for simple tasks and daily check-ins. But getting your hands on the money is another story.