Vulnerability-Lookup

ubuntu-cve-2026-82631

Vulnerability from osv_ubuntu

Published

2026-08-31 00:00

Modified

2026-08-31 00:00

Summary

Details

A security flaw has been discovered in valkey-io valkey 9.1.0. The affected element is the function handleClientsBlockedOnKey of the file src/blocked.c of the component Blocked-on-keys Subsystem. The manipulation results in use after free. The attack may be performed from remote. A high complexity level is associated with this attack. The exploitability is described as difficult. The exploit has been released to the public and may be used for attacks. The patch is identified as b2fb0e13f5b4c8c2fb63dcfc2c37a067a0d6d20b. Applying a patch is advised to resolve this issue.

Severity

2.2 (Low)


                    
                      CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:L

1.2 (Low)


                    
                      CVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-82631	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-82631	REPORT
	https://github.com/user-attachments/files/3011162…	REPORT
	https://github.com/valkey-io/valkey/	REPORT
	https://github.com/valkey-io/valkey/commit/b2fb0e…	REPORT
	https://github.com/valkey-io/valkey/issues/4198	REPORT
	https://github.com/valkey-io/valkey/pull/4212	REPORT
	https://vuldb.com/cve/CVE-2026-82631	REPORT
	https://vuldb.com/submit/893793	REPORT
	https://vuldb.com/vuln/397129	REPORT
	https://vuldb.com/vuln/397129/cti	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "valkey-redis-compat",
            "binary_version": "7.2.13+dfsg1-0ubuntu0.1"
          },
          {
            "binary_name": "valkey-sentinel",
            "binary_version": "7.2.13+dfsg1-0ubuntu0.1"
          },
          {
            "binary_name": "valkey-server",
            "binary_version": "7.2.13+dfsg1-0ubuntu0.1"
          },
          {
            "binary_name": "valkey-tools",
            "binary_version": "7.2.13+dfsg1-0ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "valkey",
        "purl": "pkg:deb/ubuntu/valkey@7.2.13+dfsg1-0ubuntu0.1?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "7.2.5+dfsg1-2ubuntu4~24.04.1",
        "7.2.7+dfsg1-0ubuntu0.24.04.1",
        "7.2.8+dfsg1-0ubuntu0.24.04.1",
        "7.2.8+dfsg1-0ubuntu0.24.04.2",
        "7.2.8+dfsg1-0ubuntu0.24.04.3",
        "7.2.10+dfsg1-0ubuntu0.1",
        "7.2.11+dfsg1-0ubuntu0.1",
        "7.2.11+dfsg1-0ubuntu0.2",
        "7.2.12+dfsg1-0ubuntu0.1",
        "7.2.13+dfsg1-0ubuntu0.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "valkey-sentinel",
            "binary_version": "9.0.4-0ubuntu0.1"
          },
          {
            "binary_name": "valkey-server",
            "binary_version": "9.0.4-0ubuntu0.1"
          },
          {
            "binary_name": "valkey-tools",
            "binary_version": "9.0.4-0ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "valkey",
        "purl": "pkg:deb/ubuntu/valkey@9.0.4-0ubuntu0.1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "8.1.3+dfsg1-0ubuntu2",
        "8.1.4+dfsg1-0ubuntu1",
        "9.0.2-0ubuntu1",
        "9.0.3-0ubuntu1",
        "9.0.3-0ubuntu2",
        "9.0.4-0ubuntu0.1"
      ]
    }
  ],
  "aliases": [],
  "details": "A security flaw has been discovered in valkey-io valkey 9.1.0. The affected element is the function handleClientsBlockedOnKey of the file src/blocked.c of the component Blocked-on-keys Subsystem. The manipulation results in use after free. The attack may be performed from remote. A high complexity level is associated with this attack. The exploitability is described as difficult. The exploit has been released to the public and may be used for attacks. The patch is identified as b2fb0e13f5b4c8c2fb63dcfc2c37a067a0d6d20b. Applying a patch is advised to resolve this issue.",
  "id": "UBUNTU-CVE-2026-82631",
  "modified": "2026-08-31T00:00:00Z",
  "published": "2026-08-31T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-82631"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-82631"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/user-attachments/files/30111628/PoC.zip"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/valkey-io/valkey/"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/valkey-io/valkey/commit/b2fb0e13f5b4c8c2fb63dcfc2c37a067a0d6d20b"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/valkey-io/valkey/issues/4198"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/valkey-io/valkey/pull/4212"
    },
    {
      "type": "REPORT",
      "url": "https://vuldb.com/cve/CVE-2026-82631"
    },
    {
      "type": "REPORT",
      "url": "https://vuldb.com/submit/893793"
    },
    {
      "type": "REPORT",
      "url": "https://vuldb.com/vuln/397129"
    },
    {
      "type": "REPORT",
      "url": "https://vuldb.com/vuln/397129/cti"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-82631"
  ]
}

CVE-2026-82631 (GCVE-0-2026-82631)

Vulnerability from cvelistv5 – Published: 2026-08-31 07:45 – Updated: 2026-08-31 11:33 X_Open Source

Title

valkey-io valkey Blocked-on-keys blocked.c handleClientsBlockedOnKey use after free

Summary

Severity

2.1 (Low)


                        
                          CVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P

2.2 (Low)


                        
                          CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C

2.2 (Low)


                        
                          CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-31 11:22 UTC

CWE

CWE-416 - Use After Free
CWE-119 - Memory Corruption

Assigner

VulDB mitre root

References

9 references

URL	Tags
https://vuldb.com/vuln/397129	vdb-entrytechnical-description
https://vuldb.com/vuln/397129/cti	signaturepermissions-required
https://vuldb.com/cve/CVE-2026-82631	third-party-advisory
https://vuldb.com/submit/893793	third-party-advisory
https://github.com/valkey-io/valkey/issues/4198	issue-tracking
https://github.com/valkey-io/valkey/pull/4212	issue-trackingpatch
https://github.com/user-attachments/files/3011162…	exploit
https://github.com/valkey-io/valkey/commit/b2fb0e…	patch
https://github.com/valkey-io/valkey/	product

Impacted products

1 product

Vendor	Product	Version
valkey-io	valkey	Affected: 9.1.0 cpe:2.3:a:valkey-io:valkey::::::::

Credits

VULL (VulDB User)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-82631",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-31T11:22:07.646542Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-31T11:33:30.966Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "cpes": [
            "cpe:2.3:a:valkey-io:valkey:*:*:*:*:*:*:*:*"
          ],
          "modules": [
            "Blocked-on-keys Subsystem"
          ],
          "product": "valkey",
          "vendor": "valkey-io",
          "versions": [
            {
              "status": "affected",
              "version": "9.1.0"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "VULL (VulDB User)"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A security flaw has been discovered in valkey-io valkey 9.1.0. The affected element is the function handleClientsBlockedOnKey of the file src/blocked.c of the component Blocked-on-keys Subsystem. The manipulation results in use after free. The attack may be performed from remote. A high complexity level is associated with this attack. The exploitability is described as difficult. The exploit has been released to the public and may be used for attacks. The patch is identified as b2fb0e13f5b4c8c2fb63dcfc2c37a067a0d6d20b. Applying a patch is advised to resolve this issue."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "baseScore": 2.1,
            "baseSeverity": "LOW",
            "vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P",
            "version": "4.0"
          }
        },
        {
          "cvssV3_1": {
            "baseScore": 2.2,
            "baseSeverity": "LOW",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C",
            "version": "3.1"
          }
        },
        {
          "cvssV3_0": {
            "baseScore": 2.2,
            "baseSeverity": "LOW",
            "vectorString": "CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C",
            "version": "3.0"
          }
        },
        {
          "cvssV2_0": {
            "baseScore": 1.7,
            "vectorString": "AV:N/AC:H/Au:M/C:N/I:N/A:P/E:POC/RL:OF/RC:C",
            "version": "2.0"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-416",
              "description": "Use After Free",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-119",
              "description": "Memory Corruption",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-31T07:45:13.359Z",
        "orgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
        "shortName": "VulDB"
      },
      "references": [
        {
          "name": "VDB-397129 | valkey-io valkey Blocked-on-keys blocked.c handleClientsBlockedOnKey use after free",
          "tags": [
            "vdb-entry",
            "technical-description"
          ],
          "url": "https://vuldb.com/vuln/397129"
        },
        {
          "name": "VDB-397129 | CTI Indicators (IOB, IOC, IOA)",
          "tags": [
            "signature",
            "permissions-required"
          ],
          "url": "https://vuldb.com/vuln/397129/cti"
        },
        {
          "name": "CVE-2026-82631 | CVE Analysis and Report",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://vuldb.com/cve/CVE-2026-82631"
        },
        {
          "name": "Submit #893793 | Valkey Project Valkey 9.1.0 Heap Use After Free",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://vuldb.com/submit/893793"
        },
        {
          "tags": [
            "issue-tracking"
          ],
          "url": "https://github.com/valkey-io/valkey/issues/4198"
        },
        {
          "tags": [
            "issue-tracking",
            "patch"
          ],
          "url": "https://github.com/valkey-io/valkey/pull/4212"
        },
        {
          "tags": [
            "exploit"
          ],
          "url": "https://github.com/user-attachments/files/30111628/PoC.zip"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/valkey-io/valkey/commit/b2fb0e13f5b4c8c2fb63dcfc2c37a067a0d6d20b"
        },
        {
          "tags": [
            "product"
          ],
          "url": "https://github.com/valkey-io/valkey/"
        }
      ],
      "tags": [
        "x_open-source"
      ],
      "timeline": [
        {
          "lang": "en",
          "time": "2026-08-30T00:00:00.000Z",
          "value": "Advisory disclosed"
        },
        {
          "lang": "en",
          "time": "2026-08-30T02:00:00.000Z",
          "value": "VulDB entry created"
        },
        {
          "lang": "en",
          "time": "2026-08-30T12:15:38.000Z",
          "value": "VulDB entry last update"
        }
      ],
      "title": "valkey-io valkey Blocked-on-keys blocked.c handleClientsBlockedOnKey use after free",
      "x_generator": [
        "VulDB PVTS v202608"
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
    "assignerShortName": "VulDB",
    "cveId": "CVE-2026-82631",
    "datePublished": "2026-08-31T07:45:13.359Z",
    "dateReserved": "2026-08-30T10:10:33.072Z",
    "dateUpdated": "2026-08-31T11:33:30.966Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

ubuntu-cve-2026-82631

Vulnerability from osv_ubuntu

CVE-2026-82631 (GCVE-0-2026-82631)

Tags

Sightings

Nomenclature