Login Request a demo
High severity · published Aug 18, 2026
CVE-2026-63639
Valkey: UAF in stream deserialization may lead to remote code execution
8.8
CVSS
1.2%
EPSS
No
On KEV
Description
Valkey is a distributed key-value database. Prior to 7.2.14, 8.0.10, 8.1.9, 9.0.5, and 9.1.1, Valkey's RESTORE command accepts a malformed RDB stream payload that assigns one Pending Entry List NACK to multiple consumers during stream consumer-group deserialization, causing a use-after-free when one consumer is deleted while another still references the shared NACK and potentially allowing remote code execution. This issue is fixed in versions 7.2.14, 8.0.10, 8.1.9, 9.0.5, and 9.1.1.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.2% · higher than 67% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
VA
valkey · valkey-io
< 7.2.14; >= 8.0.0, < 8.0.10; >= 8.1.0, < 8.1.9; >= 9.0.0, < 9.0.5; >= 9.1.0, < 9.1.1 · source: vendor
Affected product
VA
valkey
valkey-io
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-63639
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-63639
github.com
https://github.com/valkey-io/valkey/commit/06bc7768fe609f2054e69ccedefe7628f5675da9
github.com
https://github.com/valkey-io/valkey/commit/509cb3c74e8cbc9c0498ebe8b6c93dcd605e7271
github.com
https://github.com/valkey-io/valkey/commit/98465eaffe3f95524a5046318bfbc4bdb9798291
github.com
https://github.com/valkey-io/valkey/commit/e95911d4d65be8789fa3705f44d7ed1e65378445
github.com
https://github.com/valkey-io/valkey/commit/f8d2027e8d4df790ac04974bf606408c8ea62778
github.com
https://github.com/valkey-io/valkey/pull/4073
More from valkey
7.5
CVE-2026-56684
Valkey: TLS pending-data processing use-after-free may allow remote code execution
7.5
CVE-2026-27623
Valkey has Pre-Authentication DOS from malformed RESP request
7.5
CVE-2026-21863
Malformed Valkey Cluster bus message can lead to Remote DoS
7.1
CVE-2025-67733
Valkey Affected by RESP Protocol Injection via Lua error_reply
5.3
CVE-2026-85522
valkey-io valkey Slot Migration cluster_migrateslots.c createSlotImportJob out-of-bounds