CVE-2026-45751: CWE-416: Use After Free in OISF suricata
CVE-2026-45751 is a use-after-free vulnerability in Suricata, a network intrusion detection and prevention system. The flaw occurs in the inspection-buffer helper when a chained transform causes the backing buffer to be reallocated, leaving an inspection pointer referencing freed memory. This issue is triggered during specific network traffic processing and requires a particular, though not malicious, rule involving the chaining of the 'dotprefix' transform. Versions prior to 7.0.16 and versions from 8.0.0 up to but not including 8.0.5 are affected. Fixed in versions 7.0.16 and 8.0.5. The vulnerability has a CVSS score of 5.9 (medium severity) and does not impact confidentiality or integrity but can cause availability issues.
AI Analysis
Technical Summary
Suricata versions prior to 7.0.16 and between 8.0.0 and 8.0.5 contain a use-after-free vulnerability (CWE-416) in the inspection-buffer helper component. This occurs when a chained transform, specifically involving the 'dotprefix' transform, causes the backing buffer to be reallocated, leaving an inspection pointer referencing freed memory. The vulnerability is triggered during processing of specific network traffic and requires a specific rule chain to be present. The issue can lead to denial of service (availability impact). Fixed in versions 7.0.16 and 8.0.5.
Potential Impact
The vulnerability does not affect confidentiality or integrity but can cause a denial of service by crashing or destabilizing the Suricata process due to use-after-free memory access. Exploitation requires a specific rule chain and particular network traffic, reducing the likelihood of accidental triggering or widespread exploitation. No known exploits in the wild have been reported.
Mitigation Recommendations
A fix is available in Suricata versions 7.0.16 and 8.0.5. Users should upgrade to these or later versions to remediate the vulnerability. As a temporary workaround, avoid using rules that chain the 'dotprefix' transform after another transform until the upgrade can be applied.
CVE-2026-45751: CWE-416: Use After Free in OISF suricata
Description
CVE-2026-45751 is a use-after-free vulnerability in Suricata, a network intrusion detection and prevention system. The flaw occurs in the inspection-buffer helper when a chained transform causes the backing buffer to be reallocated, leaving an inspection pointer referencing freed memory. This issue is triggered during specific network traffic processing and requires a particular, though not malicious, rule involving the chaining of the 'dotprefix' transform. Versions prior to 7.0.16 and versions from 8.0.0 up to but not including 8.0.5 are affected. Fixed in versions 7.0.16 and 8.0.5. The vulnerability has a CVSS score of 5.9 (medium severity) and does not impact confidentiality or integrity but can cause availability issues.
CVSS v3.1
Score 5.9medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Suricata versions prior to 7.0.16 and between 8.0.0 and 8.0.5 contain a use-after-free vulnerability (CWE-416) in the inspection-buffer helper component. This occurs when a chained transform, specifically involving the 'dotprefix' transform, causes the backing buffer to be reallocated, leaving an inspection pointer referencing freed memory. The vulnerability is triggered during processing of specific network traffic and requires a specific rule chain to be present. The issue can lead to denial of service (availability impact). Fixed in versions 7.0.16 and 8.0.5.
Potential Impact
The vulnerability does not affect confidentiality or integrity but can cause a denial of service by crashing or destabilizing the Suricata process due to use-after-free memory access. Exploitation requires a specific rule chain and particular network traffic, reducing the likelihood of accidental triggering or widespread exploitation. No known exploits in the wild have been reported.
Mitigation Recommendations
A fix is available in Suricata versions 7.0.16 and 8.0.5. Users should upgrade to these or later versions to remediate the vulnerability. As a temporary workaround, avoid using rules that chain the 'dotprefix' transform after another transform until the upgrade can be applied.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-13T06:54:34.221Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Gcve Source
- db.gcve.eu
Threat ID: 6aa3295d91cc7f3848d18c0d
Added to database: 09/10/2026, 22:04:13 UTC
Last enriched: 09/10/2026, 22:05:33 UTC
Last updated: 09/10/2026, 22:05:33 UTC
Views: 1
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