CVE-2026-33466 json
Improper Limitation of a Pathname to a Restricted Directory in Logstash Leading to Arbitrary File Write
published 2026-04-08 7 mo ago modified 2026-09-08 2 mo ago also BIT-logstash-2026-33466 , EUVD-2026-20526
- cvss
- 8.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.6%
- EPSS 0.6% chance of exploitation in 30 days, percentile 46%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- bitnami logstash 8.19.14, 9.2.8, 9.3.3
- elastic logstash 8.19.14, 9.2.8, 9.3.3
- elasticsearch logstash 8.19.14, 9.2.8, 9.3.3
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 7 mo ago
Exploit prediction
0.55% chance of exploitation in the next 30 days, higher than 46% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| OSV | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| bitnami | logstash | >=8.0.0, <8.19.14 >=9.0.0, <9.2.8 >=9.3.0, <9.3.3 |
8.19.14 9.2.8 9.3.3 |
Affected products
- Elastic Logstash
Classification
- Weakness
-
- CWE-22 Improper Limitation of a Pathname to a Restricted Directory
References
-
discuss.elastic.co
/t/logstash-8-19-14-9-2-8-9-3-3-security-update-esa-2026-29/385816
mitigation, vendor-advisory, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-33466
web
Sources
- CVE List CVE-2026-33466
- NVD CVE-2026-33466
- OSV BIT-logstash-2026-33466
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.