CVE-2026-63639

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.89% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 56.6% of scored records. A rank, not a probability.

NVD base score

8.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD analysis status

Received. NVD last modified this record on 2026-08-20.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-08-18 14:23Z17 DAYS AGO

Last updated

2026-08-20 18:36Z15 DAYS AGO

Reserved

2026-07-17

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

High (CVSS 8.8)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weaknesses

• CWE-416Use After FreeVariant

Data version

5.2

Document digest

25f0ceedffaceae949d0d9b74a49400752771752fce793ba241bd2365154b10f

• github.comhttps://github.com/valkey-io/valkey/security/advisories/GHSA-mvcj-73cw-22m4x_refsource_CONFIRM
• github.comhttps://github.com/valkey-io/valkey/pull/4073x_refsource_MISC
• github.comhttps://github.com/valkey-io/valkey/commit/06bc7768fe609f2054e69ccedefe7628f5675da9x_refsource_MISC
• github.comhttps://github.com/valkey-io/valkey/commit/509cb3c74e8cbc9c0498ebe8b6c93dcd605e7271x_refsource_MISC
• github.comhttps://github.com/valkey-io/valkey/commit/98465eaffe3f95524a5046318bfbc4bdb9798291x_refsource_MISC
• github.comhttps://github.com/valkey-io/valkey/commit/e95911d4d65be8789fa3705f44d7ed1e65378445x_refsource_MISC
• github.comhttps://github.com/valkey-io/valkey/commit/f8d2027e8d4df790ac04974bf606408c8ea62778x_refsource_MISC
• github.comhttps://github.com/valkey-io/valkey/releases/tag/7.2.14x_refsource_MISC
• github.comhttps://github.com/valkey-io/valkey/releases/tag/8.0.10x_refsource_MISC
• github.comhttps://github.com/valkey-io/valkey/releases/tag/8.1.9x_refsource_MISC
• github.comhttps://github.com/valkey-io/valkey/releases/tag/9.0.5x_refsource_MISC
• github.comhttps://github.com/valkey-io/valkey/releases/tag/9.1.1x_refsource_MISC