CVE-2026-56684: Valkey: TLS pending-data processing use-after-free may allow remote code execution
CSIRTS triage
- What
- Valkey contains a use-after-free vulnerability in TLS pending-data processing that can be triggered remotely to execute code.
- Who is affected
- Valkey deployments accepting TLS connections with pending data buffers.
- Urgency
- High severity (CVSS 7.5) and not yet exploited; immediate patching is recommended before external exposure.
- Action
- Apply the latest Valkey security patch that fixes use-after-free in TLS pending-data handling.
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Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56684
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-566840.52% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 42% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-56684 | coverage & exploitation status | NVD · CVE.org |
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