CVE-2026-77620: CWE-409: Improper Handling of Highly Compressed Data (Data Amplification) in vectordotdev vector
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.
AI Analysis
Technical Summary
Vector, a high-performance observability data pipeline, has an improper handling of highly compressed data vulnerability (CWE-409) in its logstash source from versions 0.15.0 to before 0.57.0. The logstash source feeds each decompressed frame back into its decoder without limiting nested compression depth, allowing an unauthenticated remote attacker who can reach the default listener on 0.0.0.0:5044 to send many nested compressed frames. This causes recursive decoding that exhausts the worker thread stack and aborts the process. The nested compression also amplifies decompressed input, leading to denial of service by halting log ingestion for every tenant on a shared pipeline. The vulnerability is addressed in version 0.57.0.
Potential Impact
An unauthenticated remote attacker can cause a denial of service by sending specially crafted nested compressed frames to the default listener, resulting in recursive decoding that exhausts the worker thread stack and terminates the process. This disrupts log ingestion for all tenants sharing the pipeline, impacting availability.
Mitigation Recommendations
Upgrade Vector to version 0.57.0 or later, where this vulnerability is fixed. No other mitigation or temporary fix is indicated. Patch status is confirmed by the vendor advisory stating the fix in 0.57.0.
CVE-2026-77620: CWE-409: Improper Handling of Highly Compressed Data (Data Amplification) in vectordotdev vector
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.
CVSS v4.0
Score 8.7high
Affected software
vectordotdev
vector
pkg:cargo/github/vectordotdev/vectorRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Vector, a high-performance observability data pipeline, has an improper handling of highly compressed data vulnerability (CWE-409) in its logstash source from versions 0.15.0 to before 0.57.0. The logstash source feeds each decompressed frame back into its decoder without limiting nested compression depth, allowing an unauthenticated remote attacker who can reach the default listener on 0.0.0.0:5044 to send many nested compressed frames. This causes recursive decoding that exhausts the worker thread stack and aborts the process. The nested compression also amplifies decompressed input, leading to denial of service by halting log ingestion for every tenant on a shared pipeline. The vulnerability is addressed in version 0.57.0.
Potential Impact
An unauthenticated remote attacker can cause a denial of service by sending specially crafted nested compressed frames to the default listener, resulting in recursive decoding that exhausts the worker thread stack and terminates the process. This disrupts log ingestion for all tenants sharing the pipeline, impacting availability.
Mitigation Recommendations
Upgrade Vector to version 0.57.0 or later, where this vulnerability is fixed. No other mitigation or temporary fix is indicated. Patch status is confirmed by the vendor advisory stating the fix in 0.57.0.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-08-20T20:52:01.926Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ab29fbaf7a7c541065ca85f
Added to database: 09/22/2026, 15:33:14 UTC
Last enriched: 09/22/2026, 15:48:55 UTC
Last updated: 09/23/2026, 01:58:06 UTC
Views: 13
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