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TI-2026-54102 Aliases CVE-2026-77620

Vector: Unauthenticated denial of service in the `logstash` source via nested compressed…

Priority MEDIUM 44CWE-409Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00524 44th percentileScored 2026-11-07
Fix Fixed vector (vectordotdev): 0.57.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
vectordotdevvector0.15.0 to before 0.57.00.57.0Patch availableCNA
  • vector Vendorvectordotdev Affected 0.15.0 to before 0.57.0 Fixed in 0.57.0 Patch available CNA

Remediation

  • Fix · CNA vector (vectordotdev) Fixed in 0.57.0

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-77620
  2. 2026-11-06 Affected versions changed · Red Hat
  3. 2026-11-06 CVSS score added · Red Hat

References

Other 4

  • TI-2026-54103 Vector: Arbitrary file write in the file sink via templated path (path traversal). CVSS 4.0CRITICAL 9.3
  • TI-2026-54101 Vector: Unauthenticated denial of service in the `logstash` source via unbounded memory allocation. CVSS 4.0HIGH 8.7

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences