CVE-2026-57155Public exploitNetwork attack vector

Root code execution via GeoIP country-code path traversal

Published Oct 15, 2026 · Updated Oct 15, 2026

Path traversal in OPNsense core before 26.1.11 allows remote authenticated users to write files as root via GeoIP imports. In geoip.py, process_zip() and process_gzip() construct output paths from unvalidated CSV country_code values, allowing writes outside the GeoIP alias directory with an -IPv4 or -IPv6 suffix. Firewall Alias Edit privilege and management-interface access are required; attacker-controlled import content reaches root command execution through the default hourly newsyslog job.

CVSS severity9.9
Critical
EPSS probability0.86%
Next 30 days · Oct 20, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in OPNsense core before 26.1.11 allows remote authenticated users to write files as root via GeoIP imports. In geoip.py, process_zip() and process_gzip() construct output paths from unvalidated CSV country_code values, allowing writes outside the GeoIP alias directory with an -IPv4 or -IPv6 suffix. Firewall Alias Edit privilege and management-interface access are required; attacker-controlled import content reaches root command execution through the default hourly newsyslog job.

The record

CVE
CVE-2026-57155
Published
Oct 15, 2026
Updated
Oct 15, 2026
Vendor
Deciso B.V.
Product
core
Classifications
CWE-73, CWE-22, CWE-78, T1068
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 26.1.11

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Deciso B.V. · coreversion=< 26.1.11

Published CVSS scores

9.9GitHub CNACVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-73External Control of File Name or Path
CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1068Exploitation for Privilege Escalation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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