# CVE-2026-101950: Juniper Junos OS SRX heap overflow in SVR component

Source: https://junglewise.ai/threats/cve-2026-101950-a-heap-based-buffer-overflow-vulnerability-in-the-svr-component  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-14. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-101950 · Severity: critical · CVSS 9.8 · Published 2026-10-14

Juniper Junos OS running on SRX Series routers contains a heap buffer overflow in the Secure Vector Routing (SVR) component that can be exploited by sending malformed IPv4 packets to an interface with SVR enabled. An unauthenticated attacker on the network can trigger this vulnerability to cause a denial of service, or potentially gain unauthorized access to sensitive data or modify system information.

Technologies: [Juniper Networks Junos OS](https://junglewise.ai/threats/technologies/juniper-networks-junos-os). Vendors: [Juniper Networks](https://junglewise.ai/threats/vendors/juniper-networks).

## Quick answers

**Is CVE-2026-101950 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-101950 being exploited in the wild.

**How severe is CVE-2026-101950?** Critical severity, with a CVSS score of 9.8, published 14 October 2026.

**Which products and versions are affected?** Juniper Networks Junos OS <UNKNOWN>.

**Is there a fix for CVE-2026-101950?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-101950 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2026-101950?** Check whether you run Juniper Networks Junos OS at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A heap-based buffer overflow in the SVR component of Juniper Junos OS on SRX Series allows unauthenticated network attackers to crash the device or execute arbitrary code via crafted IPv4 packets. The vulnerability requires only network access to an SVR-enabled interface and does not require authentication or user interaction. Successful exploitation results in denial of service and potential compromise of confidentiality and integrity.

## Affected products

- Juniper Networks Junos OS <UNKNOWN>

## Timeline

- 2026-10-14: advisory

## References

- [https://supportportal.juniper.net/JSA112186](https://supportportal.juniper.net/JSA112186)

## Related threats

- [Juniper Networks Junos OS stack buffer overflow in BGP/EVPN](https://junglewise.ai/threats/cve-2026-101982-a-stack-based-buffer-overflow-vulnerability-in-the-routing)
- [Juniper Networks Junos OS stack buffer overflow in rpd](https://junglewise.ai/threats/cve-2026-101981-a-stack-based-buffer-overflow-vulnerability-in-the-routing)
- [Juniper Junos OS routing protocol daemon crash in ISO-VPN](https://junglewise.ai/threats/cve-2026-101952-an-improper-validation-of-consistency-within-input-vulnerability)
- [Juniper Networks Junos OS stack buffer overflow in BGP routing daemon](https://junglewise.ai/threats/cve-2026-102178-a-stack-based-buffer-overflow-vulnerability-in-the-bgp-routing)
- [Juniper Junos buffer overflow in SDK service process](https://junglewise.ai/threats/cve-2026-102176-a-buffer-copy-without-checking-size-of-input-classic-buffer)