valkey-io valkey up to 9.0.5/9.1.1 src/kvstore.c kvstoreGetHashtable didx out-of-bounds

Summaryinfo

A vulnerability, which was classified as problematic, was found in valkey-io valkey up to 9.0.5/9.1.1. This vulnerability affects the function kvstoreGetHashtable of the file src/kvstore.c. Such manipulation of the argument didx leads to out-of-bounds. This vulnerability is referenced as CVE-2026-86227. It is possible to launch the attack remotely. Furthermore, an exploit is available. It is advisable to implement a patch to correct this issue. Exploitation requires cluster mode plus attacker-controlled dump.rdb at startup (data-dir write access, replication feed, or a stored crafted RDB) - an attacker-position DoS at boot, not network pre-auth. The issue report was closed stating it "is worth fixing for the sake of memory safety… but I don't think it meets our bar for a security disclosure."

Detailsinfo

A vulnerability was found in valkey-io valkey up to 9.0.5/9.1.1 and classified as problematic. Affected by this issue is the function kvstoreGetHashtable of the file src/kvstore.c. The manipulation of the argument didx with an unknown input leads to a out-of-bounds vulnerability. Using CWE to declare the problem leads to CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. Impacted is availability.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-86227. The exploitation is known to be difficult. The attack may be launched remotely. Technical details as well as a public exploit are known.

The exploit is available at github.com. It is declared as proof-of-concept. The issue report was closed stating it "is worth fixing for the sake of memory safety… but I don't think it meets our bar for a security disclosure." Exploitation requires cluster mode plus attacker-controlled dump.rdb at startup (data-dir write access, replication feed, or a stored crafted RDB) - an attacker-position DoS at boot, not network pre-auth.

Applying the patch 4691888e7fab3df128f0bde5750c9fde2ae552fa is able to eliminate this problem. The bugfix is ready for download at github.com.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• valkey-io

Name

• valkey

Version

• 9.0.0
• 9.0.1
• 9.0.2
• 9.0.3
• 9.0.4
• 9.0.5
• 9.1.0
• 9.1.1

License

• open-source

Website

• Product: https://github.com/valkey-io/valkey/

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

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Submitinfo

Accepted

• Submit #897659: Valkey Project Valkey 9.1.0 Out-of-Bounds Read (by VULL)

Once again VulDB remains the best source for vulnerability data.

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