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🛡️ CVE-2026-45259 — freebsd

🟡 CVSS 6.5 — Medium ✅ No Known Exploit CWE-266 NVD
6.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality none, integrity none, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

  • Attack vector: Local — a local account, shell or session on the host is needed.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: Low — an ordinary user account is enough.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Changed — a successful attack reaches components beyond the vulnerable one.
  • Confidentiality impact: None.
  • Integrity impact: None.
  • Availability impact: High — total loss, or loss the attacker controls.

Weakness class

CVE-2026-45259 is classified as CWE-266: Incorrect Privilege Assignment. A product incorrectly assigns a privilege to a particular actor, creating an unintended sphere of control for that actor.

Affected software

CVE-2026-45259 is recorded against 1 package.

  • freebsd

Timeline and source

Published on 27 June 2026 and last revised on 1 July 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

security.freebsd.org

Other advisories for this package

freebsd has other advisories on record. If you are patching this one, these are worth checking on the same host:

Same weakness in other software

These advisories are the same class of weakness (CWE-266: Incorrect Privilege Assignment) in other software:

Details

Severity MEDIUM
CVSS Score 6.5
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
CWE CWE-266
Public Exploit ✅ No
Source NVD
Published 2026-06-27
Updated 2026-08-20
Modified 2026-07-01
Fix URL N/A

Affected Packages

Software From version Fixed in
freebsd — —

Similar Threats

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

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