CVE-2026-45259
Last modified
CVE-2026-45259 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. EPSS estimates a 0.10% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Freebsd | Freebsd | 14.3 |
| Freebsd | Freebsd | 14.4 |
| Freebsd | Freebsd | 15.0 |
References
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-45259?
How severe is CVE-2026-45259?
How do I fix CVE-2026-45259?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-45253ptrace(PT_SC_REMOTE) failed to properly validate parameters …8.4
- CVE-2026-45254In the case of the cap_net service, when a key present in th…6.5
- CVE-2026-45255When bsdinstall or bsdconfig are prompted to scan for nearby…7.5
- CVE-2026-45256When used to deliver a signal to a specific thread, thr_kill…5.5
- CVE-2026-45257The KTLS receive path decrypted each record in place, assumi…7.8
- CVE-2026-45258dsp_mmap_single() validated the requested mapping by checkin…7.8
- CVE-2026-4526In EmberZNet v9.0.2 and earlier, malformed global ZCL messag…6.5
- CVE-2026-45260Pimcore is an Open Source Data & Experience Management Platf…8.1
- CVE-2026-45261GitButler is a modern Git-based version control interface fo…9.3
- CVE-2026-45264Nextcloud is an open source content collaboration platform. …4.3
- CVE-2026-45266Nextcloud is an open source content collaboration platform. …3.5
- CVE-2026-45267Nextcloud is an open source content collaboration platform. …6.5
Are you affected by CVE-2026-45259?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST