CVE-2026-57155: critical vulnerability in opnsense core
OPNsense: Root RCE via Arbitrary File Write in GeoIP Alias Importer
Published
48Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 9.9epss 0.9%
from disclosure to weapon0 days
Published on NVDOct 15
1st PoCJul 16
exploitation probability
0.9%top 42% of all CVEs
observed exploitation
nono source reports it
1 public exploit(s)
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.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Affected products
opnsense · corepublic PoCs found — 1
githubgithub.com/babyshen/CVE-2026-57155★ 0⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
Related CVEs — opnsense core
In the same product, most dangerous first.
CVE-2026-44193CRITICALOPNsense: RCE via XMLRPC endpoint using `opnsense.restore_config_section` methodEPSS 0.9%CVE-2026-45158CRITICALOPNsense: Command Injection via Attacker-Controlled DHCP ConfigEPSS 0.8%CVE-2026-44194CRITICALOPNsense: RCE on user managmentEPSS 0.8%CVE-2026-53582HIGHOPNsense: XPATH Injection can disclose any secret in config.xmlEPSS 0.7%CVE-2026-58390HIGHOPNsense: Stored XSS to root RCE via OpenVPN client common_name in status viewsEPSS 0.5%CVE-2026-34578HIGHOPNsense has an LDAP Injection via Unsanitized Username in AuthenticationEPSS 0.5%