CVE-2026-77620 Denial of service in vector
Unauthenticated attackers can crash Vector by sending nested compressed frames to the Logstash source, causing stack exhaustion and halting log ingestion.
- 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-2026-77620?
CVE-2026-77620 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 feeds each decompressed frame back into its decoder without limiting nested compression depth. An unauthenticated remote peer that can reach the default 0.0.0.0:5044 listener can send many nested compressed frames, causing recursive decoding that exhausts the worker thread stack and aborts the process. The same nested construction amplifies decompressed input, and process termination can halt log ingestion for every tenant on a shared pipeline. This issue is fixed in version 0.57.0.
Weakness: CWE-409
Which versions are affected by CVE-2026-77620?
How do I fix CVE-2026-77620?
No fix has been published for CVE-2026-77620 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-2026-77620 being exploited?
There is no known exploitation of CVE-2026-77620 in the wild and no public exploit code.
Sources
Also known as GHSA-qp6f-fpfx-4gg6.