CVE-2026-6507 | dnsmasq Bootstrap Protocol Reply out-of-bounds write

VDB-358081 · CVE-2026-6507 · GCVE-0-2026-6507 DNSMASQ BOOTSTRAP PROTOCOL REPLY OUT-OF-BOUNDS WRITE HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 6.4 $0-$5k 2.21+ Summaryinfo A vulnerability has been found in dnsmasq and classified as critical. This impacts an unknown function of the component Bootstrap Protocol Reply Handler. This manipulation causes out-of-bounds write. This vulnerability is handled as CVE-2026-6507. The attack can be initiated remotely. There is not any exploit available. Detailsinfo A vulnerability was found in dnsmasq (the affected version unknown). It has been declared as critical. Affected by this vulnerability is an unknown part of the component Bootstrap Protocol Reply Handler. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. The CWE definition for the vulnerability is CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect availability. The summary by CVE is: A flaw was found in dnsmasq. A remote attacker could exploit an out-of-bounds write vulnerability by sending a specially crafted BOOTREPLY (Bootstrap Protocol Reply) packet to a dnsmasq server configured with the `--dhcp-split-relay` option. This can lead to memory corruption, causing the dnsmasq daemon to crash and resulting in a denial of service (DoS). The advisory is shared at access.redhat.com. This vulnerability is known as CVE-2026-6507 since 04/17/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 04/17/2026). There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product. Productinfo Type Domain Name Software Name dnsmasq License open-source CPE 2.3info 🔒 CPE 2.2info 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 6.4 VulDB Meta Temp Score: 6.4 VulDB Base Score: 5.3 VulDB Temp Score: 5.3 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 7.5 CNA Vector (redhat): 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Out-of-bounds write CWE: CWE-787 / CWE-119 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: no mitigation known Status: 🔍 0-Day Time: 🔒 Timelineinfo 04/17/2026 Advisory disclosed 04/17/2026 +0 days CVE reserved 04/17/2026 +0 days VulDB entry created 04/17/2026 +0 days VulDB entry last update Sourcesinfo Advisory: access.redhat.com Status: Not defined CVE: CVE-2026-6507 (🔒) GCVE (CVE): GCVE-0-2026-6507 GCVE (VulDB): GCVE-100-358081 Entryinfo Created: 04/17/2026 17:09 Changes: 04/17/2026 17:09 (61) Complete: 🔍 Cache ID: 99:92C:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸