CVE-2026-102178 Memory corruption in Junos OS
A stack-based buffer overflow in Junos OS BGP allows a peer to compromise the routing engine or cause denial of service when update-threading is enabled.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-102178?
CVE-2026-102178 is a critical memory corruption vulnerability in Juniper Networks Junos OS, published on 14 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A Stack-based Buffer Overflow vulnerability in the BGP routing daemon of Juniper Networks Junos OS and Junos OS Evolved allows a configured BGP flowspec peer to cause routing-engine compromise or a routing-daemon denial of service via flowspec route re-advertisement when BGP update-threading is enabled.
Weakness: CWE-121
Which versions are affected by CVE-2026-102178?
How do I fix CVE-2026-102178?
No fix has been published for CVE-2026-102178 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-102178 being exploited?
There is no known exploitation of CVE-2026-102178 in the wild and no public exploit code.
Sources
Also known as GHSA-42m5-pcqx-g75h.