Vulnerability · Published Sep 22, 2026 · Assigned by GitHub_M
CVE-2026-77620Vector: Unauthenticated denial of service in the `logstash` source via nested compressed frames (stack exhaustion and decompression amplification).
High 8.7
In plain English
A high-severity security flaw in vector from vectordotdev. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 45% of all known vulnerabilities).
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| vectordotdev | vector | >= 0.15.0, < 0.57.0 |
Weakness: CWE-409 · 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
References
- https://github.com/vectordotdev/vector/security/advisories/GHSA-qp6f-fpfx-4gg6 x_refsource_CONFIRM
- https://github.com/vectordotdev/vector/pull/25825 x_refsource_MISC
- https://github.com/vectordotdev/vector/commit/57fed991083c9a43d5fda2d5b3bf4718aedf6526 x_refsource_MISC
- https://github.com/vectordotdev/vector/releases/tag/v0.57.0 x_refsource_MISC