Vulnerability in Vrpn
CVE-2026-123200
VRPN through 07.36 contains an out-of-bounds stack write vulnerability in vrpn_Endpoint::handle_sender_message() and handle_type_message() that allows unauthenticated remote peers to write outside a stack buffer via an unchecked length index. Attackers can connect, complete the version-cookie exchange, and send a SENDER_DESCRIPTION or TYPE_DESCRIPTION message with an out-of-range or negative index to crash the process.
Published .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/vrpn/vrpn/blob/79deb000cc0b47ae49a80c92c78167c02d8a04d8/vrpn_Connect… (technical-description)
- github.com/vrpn/vrpn/blob/79deb000cc0b47ae49a80c92c78167c02d8a04d8/vrpn_Connect… (technical-description)
- github.com/vrpn/vrpn/commit/0da5b0b71e06e8c318a4e674c84caee12251a782 (patch)
- github.com/vrpn/vrpn/commit/c893b583d928fd17d756b39271b2eae71766e7f2 (patch)
- VulnCheck Advisory: VRPN through 07.36 Out-of-bounds Write via SENDER_DESCRIPTION/TYPE_DESCRIPTION length index (third-party-advisory)
Frequently asked questions
- What is CVE-2026-123200?
- CVE-2026-123200 is a high-severity vulnerability in Vrpn, classified under Improper Validation of Array Index. CVSS score: 7.5/10. Published 2026-11-05.
- How severe is CVE-2026-123200?
- High severity. CVSS v3 base score is 7.5 out of 10.