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CVE-2026-77620— Vector: Unauthenticated denial of service in the `logstash` source via nested compressed frames (stack exhaustion and decompression amplification).

Quick assessment

Affected
vectordotdev vector
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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

CVSS 8.7 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
vectordotdev vector >= 0.15.0, < 0.57.0 affected
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I. Basic Information for CVE-2026-77620

Vulnerability Information

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Vulnerability Title
Vector: Unauthenticated denial of service in the `logstash` source via nested compressed frames (stack exhaustion and decompression amplification).
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
对高度压缩数据的处理不恰当(数据放大攻击)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
vectordotdev vector >= 0.15.0, < 0.57.0 -

II. Public POCs for CVE-2026-77620

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III. Intelligence Information for CVE-2026-77620

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Patches & Fixes for CVE-2026-77620 (2)

Other References for CVE-2026-77620 (2)

Same Patch Batch · vectordotdev · 2026-09-22 · 3 CVEs total

CVE-2026-77621 9.3 CRITICAL Vector: Arbitrary file write in the file sink via templated path (path traversal).
CVE-2026-77619 8.7 HIGH Vector: Unauthenticated denial of service in the `logstash` source via unbounded memory al

IV. Related Vulnerabilities

Same product: vector
Same vendor: vectordotdev
Same weakness: CWE-409

V. Comments for CVE-2026-77620

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