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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).

HIGH
8.7
CVSS Score
Published: September 22, 2026 at 03:18 PM UTC
Updated: September 24, 2026 at 09:37 PM UTC
1 product affected across 1 vendorVector

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Severity
HIGH8.7
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Vector· Vectordotdev
60%
v < 0.57.0
Affected range stops below 0.57.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (4)

x_refsource_CONFIRM
Source: cverecord
https://github.com/vectordotdev/vector/security/advisories/GHSA-qp6f-fpfx-4gg6
x_refsource_MISC
Source: cverecord
https://github.com/vectordotdev/vector/pull/25825
x_refsource_MISC
Source: cverecord
https://github.com/vectordotdev/vector/commit/57fed991083c9a43d5fda2d5b3bf4718aedf6526
x_refsource_MISC
Source: cverecord
https://github.com/vectordotdev/vector/releases/tag/v0.57.0

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.7HIGHGitHub_M
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-409

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