VulnSocial

CVE-2026-4891Disclosure

LOWCVSS 5.3 · MEDIUM

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Patch affected systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

A heap-based out-of-bounds read vulnerability in the DNSSEC validation of dnsmasq allows remote attackers to cause a denial of service via a crafted DNS packet.

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0.5/ 10 priority

Sources & remediation

Other references
Weakness type (CWE)
CWE-125

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

STABLE

Threat summary

  • Patch or workaround signal is available
  • 3 mentions across 3 observed days
  • Momentum state: stable

What's happening

  • Patch or workaround mentioned in 1 signal
  • Technical details provided in 3 signals
  • Disclosure: 2 classified signals
  • Peaked 2d ago at 1 mentions (2026-05-11); latest day: 1
  • 3 total mentions across 3 days

Deep dive

Activity timeline3 mentions / 3d
00111Mentions · 2026-05-11: 1Mentions · 2026-05-13: 1Mentions · 2026-05-27: 1Patch / Workaround · 2026-05-27: 1Technical Details · 2026-05-11: 1Technical Details · 2026-05-13: 1Technical Details · 2026-05-27: 105-1105-1305-27
Signal classification2 categories
Disclosure
266.7%
Patch
133.3%
Referenced assets3 URLs
Classification over time
DateTotalLabels
2026-05-111
Disclosure1
2026-05-131
Disclosure1
2026-05-271
Patch1
Full discourse3 posts
  • kokumօtօ@__kokumoto
    Disclosure

    Dnsmasqに複数のメモリ脆弱性。CVE-2026-2291, CVE-2026-4890, CVE-2026-4891, CVE-2026-4892, CVE-2026-4893, CVE-2026-5172の6件。CVE-2026-4892はDHCPv6パケットでのroot権限任意コード実行。他の影響はキャッシュポイズニング、DoS、情報漏洩。 https://securityonline.info/multiple-memory-flaws-in-dnsmasq-threaten-millions-of-connected-devices/

    Post summary

    Six memory‑related vulnerabilities were disclosed in dnsmasq, including CVE‑2026‑4892 which permits root‑privilege code execution via DHCPv6 packets, along with other defects that can cause cache poisoning, DoS, and information leakage.

    010521.2K
    7.6K followersView on X
  • CVE@CVEnew
    Disclosure

    CVE-2026-4891 A heap-based out-of-bounds read vulnerability in the DNSSEC validation of dnsmasq allows remote attackers to cause a denial of service via a crafted DNS packet. https://www.cve.org/CVERecord?id=CVE-2026-4891

    Post summary

    CVE-2026-4891 exposes a heap-based out-of-bounds read in dnsmasq’s DNSSEC validation that can be exploited to cause a denial of service with crafted DNS packets, but no PoC, exploit code, patch, or active exploitation evidence is presented.

    01010392
    57.5K followersView on X
  • WindowsForum@windowsforum
    Patch

    🚨 CVE-2026-4891 proves DNSSEC isn’t magic—dnsmasq is still dodging heap bugs. This matters for Windows too: one poisoned resolver can ripple across routers, Pi-hole, and VM networks. Patch upstream. #Windows #Security #DNS https://windowsforum.com/threads/cve-2026-4891-dnsmasq-dnssec-flaw-why-windows-networks-should-patch-upstream.420079/?utm_source=x&utm_medium=social&utm_campaign=news_node84 #Dnssec #Dnsmasq #Cve20264891 https://t.co/1xD66btU5P

    Post summary

    CVE‑2026‑4891 is a heap‑corruption flaw in dnsmasq that can impact DNSSEC functionality across Windows networks; an upstream patch is recommended.

    0000069
    1.1K followersView on X

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