CVE-2026-63446: CWE-401: Missing Release of Memory after Effective Lifetime in OISF suricata
Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. From 8.0.0 until 8.0.6, AppLayerParserSetTransactionInspectId() in src/app-layer-parser.c uses an inverted guard and marks only already-inspected transactions as inspected. On flows passed by a pass rule or pass-the-flow exception policy, detection is skipped, so completed transactions remain unmarked, are never freed, and are repeatedly rescanned. The per-flow list can grow without bound with quadratic cleanup cost, causing CPU and memory exhaustion. This issue is fixed in version 8.0.6.
AI Analysis
Technical Summary
Suricata, a network intrusion detection and prevention system, has a vulnerability in the function AppLayerParserSetTransactionInspectId() in src/app-layer-parser.c from versions 8.0.0 to 8.0.5. The function uses an inverted guard that only marks already-inspected transactions as inspected. For flows passed by pass rules or pass-the-flow exception policies, detection is skipped, leaving completed transactions unmarked and never freed. These transactions are repeatedly rescanned, causing the per-flow list to grow without bound and resulting in quadratic cleanup costs that lead to CPU and memory exhaustion. The vulnerability is addressed and fixed in version 8.0.6.
Potential Impact
The vulnerability can cause CPU and memory exhaustion on affected systems due to unbounded growth of transaction lists and repeated rescanning of completed transactions. This can degrade system performance or cause denial of service conditions. There is no impact on confidentiality or integrity reported.
Mitigation Recommendations
Upgrade Suricata to version 8.0.6 or later, where this issue is fixed. No other mitigation or workaround is indicated by the available data.
CVE-2026-63446: CWE-401: Missing Release of Memory after Effective Lifetime in OISF suricata
Description
Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. From 8.0.0 until 8.0.6, AppLayerParserSetTransactionInspectId() in src/app-layer-parser.c uses an inverted guard and marks only already-inspected transactions as inspected. On flows passed by a pass rule or pass-the-flow exception policy, detection is skipped, so completed transactions remain unmarked, are never freed, and are repeatedly rescanned. The per-flow list can grow without bound with quadratic cleanup cost, causing CPU and memory exhaustion. This issue is fixed in version 8.0.6.
CVSS v3.1
Score 7.5high
Affected software
OISF
suricata
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Suricata, a network intrusion detection and prevention system, has a vulnerability in the function AppLayerParserSetTransactionInspectId() in src/app-layer-parser.c from versions 8.0.0 to 8.0.5. The function uses an inverted guard that only marks already-inspected transactions as inspected. For flows passed by pass rules or pass-the-flow exception policies, detection is skipped, leaving completed transactions unmarked and never freed. These transactions are repeatedly rescanned, causing the per-flow list to grow without bound and resulting in quadratic cleanup costs that lead to CPU and memory exhaustion. The vulnerability is addressed and fixed in version 8.0.6.
Potential Impact
The vulnerability can cause CPU and memory exhaustion on affected systems due to unbounded growth of transaction lists and repeated rescanning of completed transactions. This can degrade system performance or cause denial of service conditions. There is no impact on confidentiality or integrity reported.
Mitigation Recommendations
Upgrade Suricata to version 8.0.6 or later, where this issue is fixed. No other mitigation or workaround is indicated by the available data.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-07-16T19:35:57.767Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6aad9fc955bf5e2cf583e408
Added to database: 09/18/2026, 20:32:09 UTC
Last enriched: 09/18/2026, 20:46:37 UTC
Last updated: 09/19/2026, 00:18:38 UTC
Views: 7
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