CVE-2026-55859

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 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

0.48% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 41.5% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

NVD analysis status

Awaiting Analysis. NVD last modified this record on 2026-09-08.

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

2026-08-28 22:48Z2 MO AGO

Last updated

2026-08-31 18:53Z1 MO AGO

Reserved

2026-06-17

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

Medium (CVSS 5.9)

CNA CVSS vector

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

Weaknesses

• CWE-116Improper Encoding or Escaping of OutputClass
• CWE-838Inappropriate Encoding for Output ContextBase

Data version

5.2

Document digest

871876bf047e6075b1cd12fe81d197518022faf293d3fae97bd701969b9c0a4c

• github.comhttps://github.com/mariadb-corporation/mariadb-connector-r2dbc/security/advisories/GHSA-5rqc-86vf-g8r2x_refsource_CONFIRM
• github.comhttps://github.com/mariadb-corporation/mariadb-connector-r2dbc/commit/38bad9afebc6c581a853656a42f9ebf403b1b1b7x_refsource_MISC
• github.comhttps://github.com/mariadb-corporation/mariadb-connector-r2dbc/releases/tag/1.4.1x_refsource_MISC
• jira.mariadb.orghttps://jira.mariadb.org/browse/R2DBC-124x_refsource_MISC