CVE-2026-82677

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{"bugzilla": {"description": "valkey: Valkey: Denial of Service via double free in Module Timer subsystem", "id": "2526233", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2526233"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.9", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-1341", "details": ["A vulnerability was determined in valkey-io valkey 9.1.0. Impacted is the function moduleTimerHandler of the file src/module.c of the component Module Timer Subsystem. This manipulation causes double free. The attack can be initiated remotely. The exploit has been publicly disclosed and may be utilized. Patch name: b349fe2821e3998534b1454c1b64a478daf8c6b7. To fix this issue, it is recommended to deploy a patch.", "A flaw was found in valkey-io valkey. A remote attacker could exploit a double free vulnerability in the `moduleTimerHandler` function within the Module Timer subsystem (src/module.c). This flaw could lead to a denial of service."], "mitigation": {"lang": "en:us", "value": "Restrict access to high-privilege administrative users capable of executing module timer operations, or isolate the Valkey service using network firewalls and RBAC controls until fixed packages are installed."}, "name": "CVE-2026-82677", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "rhel10/valkey-8", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "valkey", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "rhel9/valkey-8", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "valkey", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Fix deferred", "package_name": "valkey", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-08-31T10:00:15Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-82677\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-82677\nhttps://github.com/user-attachments/files/30118801/PoC.zip\nhttps://github.com/valkey-io/valkey/\nhttps://github.com/valkey-io/valkey/commit/b349fe2821e3998534b1454c1b64a478daf8c6b7\nhttps://github.com/valkey-io/valkey/issues/4200\nhttps://github.com/valkey-io/valkey/pull/4211\nhttps://vuldb.com/cve/CVE-2026-82677\nhttps://vuldb.com/submit/893959\nhttps://vuldb.com/vuln/397172\nhttps://vuldb.com/vuln/397172/cti"], "statement": "A double-free vulnerability in the Module Timer subsystem (moduleTimerHandler in src/module.c) of Valkey allows remote, highly privileged authenticated attackers to trigger a denial of service (daemon crash) by manipulating module timers. Execution remains confined within the process runtime environment, mitigated by default SELinux policies and container isolation preventing host-level escalation.", "threat_severity": "Moderate"}

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