CVE-2026-56818

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpactpartialSuccessful exploitation gives limited 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

0.47% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 40.6% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

NVD analysis status

Analyzed. NVD last modified this record on 2026-09-23.

Red Hat severity

Important. Red Hat's rating for its own products, not a CVSS rating.

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

2026-08-07 17:14Z2 MO AGO

Last updated

2026-08-08 03:01Z2 MO AGO

Reserved

2026-06-23

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

Medium (CVSS 6.5)

CNA CVSS vector

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

Weaknesses

• CWE-401Missing Release of Memory after Effective LifetimeVariant
• CWE-703Improper Check or Handling of Exceptional ConditionsPillar
• CWE-772Missing Release of Resource after Effective LifetimeBase

Data version

5.2

Document digest

fb38eecab32c11eaafeee427092e8e1416df6fb83ed32b5156d50f1c723ae9b3

• github.comhttps://github.com/netty/netty/security/advisories/GHSA-p9jm-q85p-7mcpx_refsource_CONFIRM
• github.comhttps://github.com/netty/netty/pull/17065x_refsource_MISC
• github.comhttps://github.com/netty/netty/commit/5b68c61f37aa4a3045cba624cbea239655c9003bx_refsource_MISC
• github.comhttps://github.com/netty/netty/commit/bb2ff68a1fb71cb4b0eb9a9e17b66c52aff680c6x_refsource_MISC