CVE-2026-77619 Vector: Unauthenticated denial of service in the `logstash` source via unbounded memory allocation.
Unauthenticated attackers can cause denial of service in Vector by sending crafted logstash frames that trigger excessive memory allocation.
- 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-2026-77619?
CVE-2026-77619 is a high-severity denial of service vulnerability in vectordotdev vector, published on 22 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Vector is a high-performance observability data pipeline. From 0.15.0 until 0.57.0, the logstash source reads a 32-bit compressed-frame length from the network and uses it to size an in-memory buffer without an upper bound. An unauthenticated remote peer that can reach the default 0.0.0.0:5044 listener can send a minimal frame declaring a multi-gigabyte payload, causing an excessive allocation that can abort Vector or invoke the host OOM killer. Because the allocation follows the declared length rather than bytes transmitted, the attacker has low resource cost, and process termination can halt log ingestion for every tenant on a shared pipeline. This issue is fixed in version 0.57.0.
Which versions are affected by CVE-2026-77619?
How do I fix CVE-2026-77619?
No fix has been published for CVE-2026-77619 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-77619 being exploited?
There is no known exploitation of CVE-2026-77619 in the wild and no public exploit code.
Sources
Also known as GHSA-rrfg-9487-mhp6.