CVE-2026-123200
What it is
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.
At a glance
- Exploitability
- Can be exploited over the network without logging in. High risk of service disruption.
- Exploit odds
- 0.4% chance of exploitation in the next 30 days (EPSS).
- Fix
- A patch, advisory or fixed version is referenced. Upgrade or apply it.
Timeline
- ReservedThe CVE id was reserved by its CNA
- PublishedDisclosed publicly on CVE.org and NVD
- Last updatedMost recent change to the record
Why it ranks here
- Exploited in the wild: no, CISA does not list it.
- Exploit odds: 0.4% in the next 30 days (EPSS).
- Severity: 8.7 HIGH (CVSS).
- Fix: a patch or advisory is linked.
Details
- Published
- Last modified
- Exploit probability
- 0.4% · EPSS, next 30 days
- Weakness
- CWE-129
- Record status
- Received
Attack profile CVSS 4.0 · 8.7
- Attack vector
- Network
- Complexity
- Low
- Attack requirements
- None
- Privileges needed
- None
- User interaction
- None
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Raw vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/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
Is it in your code?
Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.
Read https://cve-list.com/agent/cve/CVE-2026-123200.md and follow it. Check whether this project is affected by CVE-2026-123200. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.
Fix and advisories
- https://github.com/vrpn/vrpn/commit/0da5b0b71e06e8c318a4e674c84caee12251a782
- https://github.com/vrpn/vrpn/commit/c893b583d928fd17d756b39271b2eae71766e7f2
References
- https://github.com/vrpn/vrpn/blob/79deb000cc0b47ae49a80c92c78167c02d8a04d8/vrpn_Connection.C#L4482
- https://github.com/vrpn/vrpn/blob/79deb000cc0b47ae49a80c92c78167c02d8a04d8/vrpn_Connection.C#L4554
- https://github.com/vrpn/vrpn/commit/0da5b0b71e06e8c318a4e674c84caee12251a782
- https://github.com/vrpn/vrpn/commit/c893b583d928fd17d756b39271b2eae71766e7f2
- https://www.vulncheck.com/advisories/vrpn-through-07.36-out-of-bounds-write-via-sender-description-type-description-length-index