CVE-2026-33466
CVE-2026-33466 is a high-severity vulnerability in Elastic Logstash with a CVSS 3.x base score of 8.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-22.
Key facts
- Severity: High (CVSS 3.x base score 8.1)
- EPSS exploit prediction: 1% (42nd percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-20526
- Weakness: CWE-22
- Affected product: Elastic Logstash
- Published:
- Last modified:
Description
Improper Limitation of a Pathname to a Restricted Directory (CWE-22) in Logstash can lead to arbitrary file write and potentially remote code execution via Relative Path Traversal (CAPEC-139). The archive extraction utilities used by Logstash do not properly validate file paths within compressed archives. An attacker who can serve a specially crafted archive to Logstash through a compromised or attacker-controlled update endpoint can write arbitrary files to the host filesystem with the privileges of the Logstash process. In certain configurations where automatic pipeline reloading is enabled, this can be escalated to remote code execution.
Frequently asked questions
- What is CVE-2026-33466?
- Improper Limitation of a Pathname to a Restricted Directory (CWE-22) in Logstash can lead to arbitrary file write and potentially remote code execution via Relative Path Traversal (CAPEC-139). The archive extraction utilities used by Logstash do not properly validate file paths within compressed archives. An attacker who can serve a specially crafted archive to Logstash through a compromised or attacker-controlled update endpoint can write arbitrary files to the host filesystem with the privileges of the Logstash process. In certain configurations where automatic pipeline reloading is enabled, this can be escalated to remote code execution.
- How severe is CVE-2026-33466?
- CVE-2026-33466 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2026-33466 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-33466?
- CVE-2026-33466 affects Elastic Logstash. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-33466?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- Does CVE-2026-33466 have an EU (EUVD) identifier?
- Yes. CVE-2026-33466 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-20526.
- When was CVE-2026-33466 published?
- CVE-2026-33466 was published on 2026-04-08 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:elastic:logstash:*:*:*:*:*:*:*:*
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