GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

CVE-2026-63448 (GCVE-0-2026-63448)

Vulnerability from cvelistv5 – Published: 2026-09-18 20:20 – Updated: 2026-09-18 20:20
VLAI
Title
Suricata smb: some SMB flows can cause resource exhaustion
Summary
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.
Severity
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-400 - Uncontrolled Resource Consumption
  • CWE-401 - Missing Release of Memory after Effective Lifetime
  • CWE-407 - Inefficient Algorithmic Complexity
Assigner
References
Impacted products
Vendor Product Version CPE status
OISF suricata Affected: >= 8.0.0, < 8.0.6
Affected: < 7.0.17
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "suricata",
          "vendor": "OISF",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 8.0.0, \u003c 8.0.6"
            },
            {
              "status": "affected",
              "version": "\u003c 7.0.17"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-400",
              "description": "CWE-400: Uncontrolled Resource Consumption",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-401",
              "description": "CWE-401: Missing Release of Memory after Effective Lifetime",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-407",
              "description": "CWE-407: Inefficient Algorithmic Complexity",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-18T20:20:01.185Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/OISF/suricata/security/advisories/GHSA-hvvj-c8xx-9g35",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/OISF/suricata/security/advisories/GHSA-hvvj-c8xx-9g35"
        },
        {
          "name": "https://github.com/OISF/suricata/commit/755d6c3061de4d7ba97f0ed31cdc17ab8cab4476",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/OISF/suricata/commit/755d6c3061de4d7ba97f0ed31cdc17ab8cab4476"
        },
        {
          "name": "https://github.com/OISF/suricata/commit/7ec9d72d28b9370712cf77a5b9d40d6b5db27cb4",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/OISF/suricata/commit/7ec9d72d28b9370712cf77a5b9d40d6b5db27cb4"
        },
        {
          "name": "https://github.com/OISF/suricata/commit/88adab8bd3d62912941647ab65032d5ec75c893a",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/OISF/suricata/commit/88adab8bd3d62912941647ab65032d5ec75c893a"
        },
        {
          "name": "https://github.com/OISF/suricata/commit/9a54a043516e644bb7b9d34117a91977f950a281",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/OISF/suricata/commit/9a54a043516e644bb7b9d34117a91977f950a281"
        },
        {
          "name": "https://github.com/OISF/suricata/commit/bc39274a638d1cca2391cfa4891c8b6c255ff9ce",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/OISF/suricata/commit/bc39274a638d1cca2391cfa4891c8b6c255ff9ce"
        },
        {
          "name": "https://github.com/OISF/suricata/commit/c8f68b0e4f9e721dca1c9ed6e08597c6964c7ac3",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/OISF/suricata/commit/c8f68b0e4f9e721dca1c9ed6e08597c6964c7ac3"
        },
        {
          "name": "https://github.com/OISF/suricata/releases/tag/suricata-7.0.17",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/OISF/suricata/releases/tag/suricata-7.0.17"
        },
        {
          "name": "https://github.com/OISF/suricata/releases/tag/suricata-8.0.6",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/OISF/suricata/releases/tag/suricata-8.0.6"
        },
        {
          "name": "https://redmine.openinfosecfoundation.org/issues/8629",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://redmine.openinfosecfoundation.org/issues/8629"
        }
      ],
      "source": {
        "advisory": "GHSA-hvvj-c8xx-9g35",
        "discovery": "UNKNOWN"
      },
      "title": "Suricata smb: some SMB flows can cause resource exhaustion"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-63448",
    "datePublished": "2026-09-18T20:20:01.185Z",
    "dateReserved": "2026-07-16T19:35:57.767Z",
    "dateUpdated": "2026-09-18T20:20:01.185Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "product": "suricata",
                "vendor": "OISF",
                "versions": [
                  {
                    "status": "affected",
                    "version": "\u003e= 8.0.0, \u003c 8.0.6"
                  },
                  {
                    "status": "affected",
                    "version": "\u003c 7.0.17"
                  }
                ]
              }
            ],
            "source": "security-advisories@github.com"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "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."
          }
        ],
        "id": "CVE-2026-63448",
        "lastModified": "2026-09-18T21:17:04.060",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "HIGH",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 5.9,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 2.2,
              "impactScore": 3.6,
              "source": "security-advisories@github.com",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-09-18T21:17:04.060",
        "references": [
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/OISF/suricata/commit/755d6c3061de4d7ba97f0ed31cdc17ab8cab4476"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/OISF/suricata/commit/7ec9d72d28b9370712cf77a5b9d40d6b5db27cb4"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/OISF/suricata/commit/88adab8bd3d62912941647ab65032d5ec75c893a"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/OISF/suricata/commit/9a54a043516e644bb7b9d34117a91977f950a281"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/OISF/suricata/commit/bc39274a638d1cca2391cfa4891c8b6c255ff9ce"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/OISF/suricata/commit/c8f68b0e4f9e721dca1c9ed6e08597c6964c7ac3"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/OISF/suricata/releases/tag/suricata-7.0.17"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/OISF/suricata/releases/tag/suricata-8.0.6"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/OISF/suricata/security/advisories/GHSA-hvvj-c8xx-9g35"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://redmine.openinfosecfoundation.org/issues/8629"
          }
        ],
        "sourceIdentifier": "security-advisories@github.com",
        "vulnStatus": "Received",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-400"
              },
              {
                "lang": "en",
                "value": "CWE-401"
              },
              {
                "lang": "en",
                "value": "CWE-407"
              }
            ],
            "source": "security-advisories@github.com",
            "type": "Primary"
          }
        ]
      }
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.