CVE-2026-57155 (GCVE-0-2026-57155)
Vulnerability from cvelistv5 – Published: 2026-10-15 15:13 – Updated: 2026-10-15 15:45
VLAI
EPSS
VEX
Title
OPNsense: Root RCE via Arbitrary File Write in GeoIP Alias Importer
Summary
OPNsense is a FreeBSD based firewall and routing platform. Prior to version 26.1.11, the Firewall Alias GeoIP importer's process_zip() and process_gzip() paths in src/opnsense/scripts/filter/lib/alias/geoip.py use an unvalidated CSV country_code value to construct output filenames below /usr/local/share/GeoIP/alias. A user with Firewall Alias Edit privilege can configure an attacker-controlled GeoIP source URL and supply an archive whose country code traverses into another existing directory, causing attacker-controlled content to be written as root with an -IPv4 or -IPv6 suffix. A crafted newsyslog fragment and oversized log file can use the default hourly root cron job to execute commands as root, resulting in complete firewall compromise. This issue is fixed in version 26.1.11.
Severity
9.9 (Critical)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-15 15:45 UTC
CWE
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/opnsense/core/security/advisor… | x_refsource_CONFIRM |
| https://github.com/opnsense/core/commit/c46aced9c… | x_refsource_MISC |
| https://github.com/opnsense/core/commit/e7fbfaa7f… | x_refsource_MISC |
| https://hackerask.com/posts/opnsense | x_refsource_MISC |
Impacted products
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Browse all ATT&CK techniques and the vulnerabilities related to each.
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