Is CVE-2026-85522 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-85522 being exploited in the wild.

How severe is CVE-2026-85522?

Medium severity, with a CVSS score of 5.3, published 4 September 2026.

Which products and versions are affected?

valkey-io Valkey up to 9.5.4 and 9.1.0.

Is there a fix for CVE-2026-85522?

A patch was published on 2026-07-21: Fix committed (f4dc3ca09eb650c2fe14060090a41c524eca803f) Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-85522 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-85522?

Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-85522: Valkey out-of-bounds read in slot migration job creation

CVE-2026-85522 · Severity: medium · CVSS 5.3 · Published 2026-09-04

Valkey is an open-source, distributed key-value database used for caching and real-time workloads. A vulnerability in the slot migration feature allows a malicious RDB (snapshot) file with a crafted job name to trigger an out-of-bounds memory read during server startup, potentially allowing remote attackers to read sensitive data or cause a denial of service.

Quick answers

Is CVE-2026-85522 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-85522 being exploited in the wild.
How severe is CVE-2026-85522?: Medium severity, with a CVSS score of 5.3, published 4 September 2026.
Which products and versions are affected?: valkey-io Valkey up to 9.5.4 and 9.1.0.
Is there a fix for CVE-2026-85522?: A patch was published on 2026-07-21: Fix committed (f4dc3ca09eb650c2fe14060090a41c524eca803f) Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-85522 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-85522?: Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The vulnerability is an out-of-bounds read in the `createSlotImportJob()` function within `src/cluster_migrateslots.c`. The root cause is that `clusterRDBLoadSlotImport()` accepts a variable-length `job_name` from an RDB file, but `createSlotImportJob()` always copies exactly `CLUSTER_NAMELEN` (40) bytes via `memcpy`, without validating the actual length. A crafted RDB file with a job_name shorter than 40 bytes triggers a heap out-of-bounds read during server startup. The attack vector is network-accessible if an attacker can provide a malicious RDB file (e.g., via replication or file upload). The fix validates that `job_name` length matches `CLUSTER_NAMELEN` exactly, matching the existing command-path check. Patches are available in versions 9.0.5 and 9.1.1 (commit f4dc3ca09eb650c2fe14060090a41c524eca803f).

Affected products

valkey-io Valkey up to 9.5.4 and 9.1.0

Timeline

2026-09-04: disclosed: CVE-2026-85522 published
2026-07-21: patched: Fix committed (f4dc3ca09eb650c2fe14060090a41c524eca803f)
2026-07-22: other: Patch authored

References

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