CVE-2026-45762: CWE-843: Access of Resource Using Incompatible Type ('Type Confusion') in OISF suricata
Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. Prior to versions 7.0.16 and 8.0.5, Suricata's IP defragmentation tracker lookup did not verify that an existing tracker used the same IP address family as the packet being processed. Under crafted fragmented IPv4/IPv6 traffic, an IPv6 fragment could be associated with an IPv4 defragmentation tracker. This can lead to a remote packet-triggered crash and denial of service when Suricata performs the relevant defragmentation. Versions 7.0.16 and 8.0.5 contain a fix. As a workaround, if using Suricata as an IDS with AF_PACKET, enabling AF_PACKET's `defrag` option may prevent Suricata from seeing such fragmented packets.
AI Analysis
Technical Summary
Suricata's IP defragmentation tracker did not verify that the IP address family of an existing tracker matched the packet being processed. This allowed crafted fragmented IPv6 traffic to be associated with an IPv4 defragmentation tracker, leading to type confusion (CWE-843). This flaw can cause a remote packet-triggered crash and denial of service. The vulnerability affects Suricata versions >=8.0.0 <8.0.5 and all versions prior to 7.0.16. Versions 7.0.16 and 8.0.5 contain fixes that properly verify IP address family during defragmentation tracking. No known exploits in the wild have been reported.
Potential Impact
An attacker can send crafted fragmented IPv6/IPv4 packets that cause Suricata to crash due to type confusion in the defragmentation tracker. This results in a denial of service, impacting network security monitoring and intrusion detection capabilities. There is no confidentiality or integrity impact reported.
Mitigation Recommendations
Apply the official fixes by upgrading Suricata to version 7.0.16 or 8.0.5 or later. If upgrading immediately is not possible and Suricata is used as an IDS with AF_PACKET, enable the AF_PACKET 'defrag' option to prevent fragmented packets from reaching Suricata and triggering the vulnerability. This workaround may reduce exposure until the patch can be applied.
CVE-2026-45762: CWE-843: Access of Resource Using Incompatible Type ('Type Confusion') in OISF suricata
Description
Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. Prior to versions 7.0.16 and 8.0.5, Suricata's IP defragmentation tracker lookup did not verify that an existing tracker used the same IP address family as the packet being processed. Under crafted fragmented IPv4/IPv6 traffic, an IPv6 fragment could be associated with an IPv4 defragmentation tracker. This can lead to a remote packet-triggered crash and denial of service when Suricata performs the relevant defragmentation. Versions 7.0.16 and 8.0.5 contain a fix. As a workaround, if using Suricata as an IDS with AF_PACKET, enabling AF_PACKET's `defrag` option may prevent Suricata from seeing such fragmented packets.
CVSS v3.1
Score 7.5high
Affected software
OISF
suricata
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Suricata's IP defragmentation tracker did not verify that the IP address family of an existing tracker matched the packet being processed. This allowed crafted fragmented IPv6 traffic to be associated with an IPv4 defragmentation tracker, leading to type confusion (CWE-843). This flaw can cause a remote packet-triggered crash and denial of service. The vulnerability affects Suricata versions >=8.0.0 <8.0.5 and all versions prior to 7.0.16. Versions 7.0.16 and 8.0.5 contain fixes that properly verify IP address family during defragmentation tracking. No known exploits in the wild have been reported.
Potential Impact
An attacker can send crafted fragmented IPv6/IPv4 packets that cause Suricata to crash due to type confusion in the defragmentation tracker. This results in a denial of service, impacting network security monitoring and intrusion detection capabilities. There is no confidentiality or integrity impact reported.
Mitigation Recommendations
Apply the official fixes by upgrading Suricata to version 7.0.16 or 8.0.5 or later. If upgrading immediately is not possible and Suricata is used as an IDS with AF_PACKET, enable the AF_PACKET 'defrag' option to prevent fragmented packets from reaching Suricata and triggering the vulnerability. This workaround may reduce exposure until the patch can be applied.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-13T07:45:21.250Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6aa321e791cc7f3848c5a091
Added to database: 09/10/2026, 21:32:23 UTC
Last enriched: 09/10/2026, 21:46:56 UTC
Last updated: 09/10/2026, 22:12:31 UTC
Views: 3
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