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CVE-2026-63446— Suricata app-layer: passed flows can retain transactions, causing resource exhaustion

Quick assessment

Affected
OISF suricata
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Suricata 是一个网络入侵检测系统（IDS）、入侵防御系统（IPS）和网络流量安全监控引擎。在 8.0.0 到 8.0.6 版本中，位于 文件中的 函数使用了一个反向的保护逻辑（inverted guard），仅将那些已经检查过的交易标记为“已检查”。当数据流通过“pass 规则”或“pass-the-flow”例外策略时，检测过程被跳过，导致已完成（completed）的交易仍未被标记为已检查，因而永远不会被释放，并被反复重新扫描。这会导致每个数据流的列表无限增长，清理成本呈二次方增长，最终导致 CPU 和

CVSS 7.5 · High

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-63446

Vulnerability Information
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Vulnerability Title
Suricata app-layer: passed flows can retain transactions, causing resource exhaustion
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
在移除最后引用时对内存的释放不恰当(内存泄露)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
OISF suricata >= 8.0.0, < 8.0.6 -

II. Public POCs for CVE-2026-63446

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III. Intelligence Information for CVE-2026-63446

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Patches & Fixes for CVE-2026-63446 (3)

Other References for CVE-2026-63446 (3)

Same Patch Batch · OISF · 2026-09-18 · 17 CVEs total

CVE-2026-57228 8.2 HIGH Suricata smtp/mime: heap out-of-bounds read quoted-printable decoder
CVE-2026-63447 7.5 HIGH Suricata ftp: crafted FTP traffic can cause quadratic CPU consumption
CVE-2026-63452 7.5 HIGH Suricata http1: repeated brotli compression bombs can cause excessive CPU consumption
CVE-2026-57227 7.5 HIGH Suricata mqtt: unbounded resource consumption from repeated pubrec and pubrel messages
CVE-2026-71418 7.5 HIGH Suricata doh2: crafted HTTP/2 DATA frames can cause quadratic CPU consumption
CVE-2026-57223 7.0 HIGH Suricata windows: unquoted LocalSystem service ImagePath can allow local privilege escalat
CVE-2026-57224 6.5 MEDIUM Suricata dhcp: unbounded transactions in unidirectional traffic can lead to resource exhau
CVE-2026-63448 5.9 MEDIUM Suricata smb: some SMB flows can cause resource exhaustion
CVE-2026-71855 5.9 MEDIUM Suricata flow: IPv4/IPv6 hash collision can reuse wrong flow state
CVE-2026-57229 5.3 MEDIUM Suricata smtp/mime: incomplete state reset allows detection bypass
CVE-2026-57222 5.3 MEDIUM Suricata ippair: hash collision can cause incorrect state reuse across IPv4 and IPv6
CVE-2026-63450 3.7 LOW Suricata ftp: RETR/STOR before PORT/PASV can disable further IDS app-layer detection
CVE-2026-63449 3.7 LOW Suricata sip: large SIP message bodies can evade detection with frame keyword
CVE-2026-57226 3.7 LOW Suricata swf: heap buffer overflow in SWF decompression depth handling
CVE-2026-63451 3.3 LOW Suricata detect: frame rules without content and with transform can cause heap buffer over
CVE-2026-57225 3.3 LOW Suricata datasets: NULL pointer dereference in JSON/NDJSON dataset loading

IV. Related Vulnerabilities

Same product: suricata
Same vendor: OISF
Same weakness: CWE-401

V. Comments for CVE-2026-63446

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