Reference page — cumulative record through Saturday, October 3, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-63448

CVE-2026-63448HIGH

OISF suricata — Suricata smb: some SMB flows can cause resource exhaustion

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  N  N  H    7.5   .0045   36.6     —

AFFECTED
  Product   Versions             Fixed
  suricata  >= 8.0.0, < 8.0.6 –  —

TIMELINE
  Jul 16  Reserved by GitHub_M
  Sep 18  Published (CNA: GitHub_M)
  Sep 28  RESCORED — CVE-2026-63448 (OISF suricata). CVSS 5.9 → 7.5 (NVD).

CWE-400, CWE-401, CWE-407 · CNA: GitHub_M · CVSS v3.1 · 10 references · NVD status: Analyzed

Description

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. Prior to 7.0.17 and 8.0.6, the SMB parser can retain force-completed transactions on flows where Suricata sees payload in only one direction, including async-oneside flows, because cleanup waits for inspection in the unseen direction. The transaction creation paths in rust/src/smb can exceed the intended SMB_MAX_TX bound, and cleanup repeatedly scans the growing list. Sustained one-directional SMB traffic can therefore cause unbounded per-flow state and CPU and memory exhaustion. This issue is fixed in versions 8.0.6 and 7.0.17.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
July 16, 2026	Reserved	Reserved by GitHub_M
September 18, 2026	Published	Published (CNA: GitHub_M)
September 28, 2026	RESCORED	RESCORED — CVE-2026-63448 (OISF suricata). CVSS 5.9 → 7.5 (NVD).

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
OISF	suricata	—	>= 8.0.0, < 8.0.6	—

Weaknesses

CWE-400 · CWE-401 · CWE-407

References (10)

https://github.com/OISF/suricata/commit/755d6c3061de4d7ba97f0ed31cdc17ab8cab4476 [Patch]
https://github.com/OISF/suricata/commit/7ec9d72d28b9370712cf77a5b9d40d6b5db27cb4 [Patch]
https://github.com/OISF/suricata/commit/88adab8bd3d62912941647ab65032d5ec75c893a [Patch]
https://github.com/OISF/suricata/commit/9a54a043516e644bb7b9d34117a91977f950a281 [Patch]
https://github.com/OISF/suricata/commit/bc39274a638d1cca2391cfa4891c8b6c255ff9ce [Patch]
https://github.com/OISF/suricata/commit/c8f68b0e4f9e721dca1c9ed6e08597c6964c7ac3 [Patch]
https://github.com/OISF/suricata/releases/tag/suricata-7.0.17 [Release Notes]
https://github.com/OISF/suricata/releases/tag/suricata-8.0.6 [Release Notes]
https://github.com/OISF/suricata/security/advisories/GHSA-hvvj-c8xx-9g35 [Mitigation, Vendor Advisory]
https://redmine.openinfosecfoundation.org/issues/8629 [Permissions Required]

Authoritative record: CVE-2026-63448 at cve.org

Vendors: oisf

Weaknesses: CWE-400 · CWE-401 · CWE-407

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-63448 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Saturday, October 3, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.