CVE-2026-56790

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.
• 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

0.30% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 23.4% of scored records. A rank, not a probability.

NVD base score

7.0 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

NVD analysis status

Deferred. NVD last modified this record on 2026-10-25.

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

2026-06-25 18:14Z4 MO AGO

Last updated

2026-07-14 21:34Z3 MO AGO

Reserved

2026-06-23

Assigning CNA

VulnCheck

Record state

PUBLISHED

Severity

High (CVSS 7.0)

CNA CVSS vector

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N

Weaknesses

• CWE-193Off-by-one ErrorBase

Data version

5.2

Document digest

8668d2b30642db9f56cf82d1ec1ef810b1a6ce4ff5136b53c876508ac5164b4b

• github.comResearcher Disclosurehttps://github.com/canboat/canboat/issues/644technical-descriptionexploit
• github.comPull Requesthttps://github.com/canboat/canboat/pull/649issue-tracking
• github.comPatch Commithttps://github.com/canboat/canboat/commit/a5a22b74b9ac5688019cba62669df08562cebd6fpatch
• www.vulncheck.comhttps://www.vulncheck.com/advisories/canboat-off-by-one-global-buffer-overflow-in-searchforpgnthird-party-advisory