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VulnerabilityCVE-2026-45259Published 2026-06-27

CVE-2026-45259 — FreeBSD

As of 2026-06-27, CVE-2026-45259 is a vulnerability in FreeBSD, EPSS 0.1% (3.7th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-45259 as of 2026-06-27; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

CVSS
—Not yet scored
EPSS
0.1%Higher than 3.7% of scored CVEs
CISA KEV
NoNot in the KEV catalog
Tracked threats
0None linked yet
Priority
0.2/10Threadlinqs triage score
Published
EPSS 0.1% (higher than 3.7% of all scored CVEs) · Priority 0.2/10 · Published 2026-06-27

Last updated:

What is CVE-2026-45259?

sigqueue(2) was marked as permitted in capability mode with the introduction of Capsicum in 2011, but the implementation of kern_sigqueue did not include a capability mode check restricting signal delivery to the calling process's own PID. A process in capability mode can use sigqueue(2) to send signals to any process it could signal following standard Unix permissions, bypassing the Capsicum sandbox restriction. A compromised sandboxed process could interfere with other processes, for example by sending SIGKILL or SIGSTOP. This could be any process running as the same user, or any process, for a superuser sandboxed process.

The record classifies CVE-2026-45259 under weakness class CWE-266. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 100 days ago.

Severity and exploitation probability

EPSS (FIRST)
0.1% probability of exploitation in the next 30 days, higher than 3.7% of all scored CVEs
CISA KEV
Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority
0.2/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published
2026-06-27

Is CVE-2026-45259 being exploited?

It currently carries a trending score of 30 in the Threadlinqs vulnerability feed.

Affected products and versions

How to fix CVE-2026-45259

No vendor patch reference has been recorded for CVE-2026-45259 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

Threat activity tracking CVE-2026-45259

No threat campaign in the Threadlinqs corpus currently references CVE-2026-45259, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

Sources

Enriched from CVE.org, NVD, FIRST EPSS. Last verified by Threadlinqs on . This product uses the NVD API but is not endorsed or certified by the NVD.

Vendor advisory and patch