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Back to active CVEs
Critical · CVSS 9.9CVE-2026-57155

OPNsense: Root RCE via Arbitrary File Write in GeoIP Alias ImporterCVE-2026-57155

Answer in brief

CVE-2026-57155 records a Critical severity (CVSS 9.9) vulnerability in OPNsense: Root RCE via Arbitrary File Write in GeoIP Alias Importer. The current sources do not mark it as known exploited. The current feed maps opnsense/core (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 15, 2026Updated Oct 15, 2026Source checked Oct 15, 2026First seen by HOL Oct 15, 2026Material review Oct 15, 2026
Upstream Advisory

Key facts

Risk
Critical · CVSS 9.9
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 9.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps opnsense/core (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
opnsense/coregeneric<26.1.1126.1.11

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for opnsense/core.
  2. 2Review the reported fix. Update opnsense/core to 26.1.11 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 15, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 15, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 15, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • Source referencehackerask.com
Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • OPNsense: Log Forgery via Login Username CRLF in WebGUI Authentication → Pf Table IP BlockingSame opnsense/core package
  • OPNsense: Direct comma-separated user privileges bypass OPNsense MVC read-only write protectionSame opnsense/core package
  • CUPS ipp backend status-line injection can update queue PPD and lead to conditional RCE as lp via foomatic-ripAlso CWE-78
  • OpenPrinting CUPS: root-side banner file disclosureAlso CWE-22
  • Lychee: Path traversal in `SecurePathController` allows authenticated arbitrary file readAlso CWE-22
  • Wildfly-core: wildfly-core: deployer rbac role privilege escalation via path traversal in deployment nameAlso CWE-22

Record context

Vulnerability class
Path Traversal
EPSS
Not reported
CWE IDs
CWE-22, CWE-73, CWE-78
Source
CVE List V5
Source checked
Oct 15, 2026
References
4 linked sources
Open source record