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CVE-2026-57155— OPNsense: Root RCE via Arbitrary File Write in GeoIP Alias Importer

Quick assessment

Affected
opnsense core
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OPNsense 是一款基于 FreeBSD 的防火墙和路由平台。在版本 26.1.11 之前， 文件中的防火墙别名 GeoIP 导入器的 和 路径，会使用一个未经校验的 CSV 字段 来构造输出文件名，这些文件位于 目录下。具有“防火墙别名编辑”权限的用户可以配置一个由攻击者控制的 GeoIP 数据源 URL，并提供一个压缩包，其 字段可遍历到另一个已存在的目录，从而导致以 root 权限写入攻击者可控的内容（文件名将带有 或 后缀）。此外，通过精心构造的 newsyslog 片段以及过大的日志文件，可以触发默认

CVSS 9.9 · Critical

Affected Version Matrix 1

VendorProduct Version RangeStatus
opnsense core < 26.1.11 affected
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I. Basic Information for CVE-2026-57155

Vulnerability Information
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Vulnerability Title
OPNsense: Root RCE via Arbitrary File Write in GeoIP Alias Importer
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
opnsense core < 26.1.11 -

II. Public POCs for CVE-2026-57155

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III. Intelligence Information for CVE-2026-57155

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Patches & Fixes for CVE-2026-57155 (2)

Vendor Advisories for CVE-2026-57155 (1)

Security Blog Posts for CVE-2026-57155 (1)

Same Patch Batch · opnsense · 2026-10-15 · 10 CVEs total

CVE-2026-63442 8.1 HIGH OPNsense: Log Forgery via Login Username CRLF in WebGUI Authentication → Pf Table IP Block
CVE-2026-58390 8.0 HIGH OPNsense: Stored XSS to root RCE via OpenVPN client common_name in status views
CVE-2026-53582 7.1 HIGH OPNsense: XPATH Injection can disclose any secret in config.xml
CVE-2026-71490 7.1 HIGH OPNsense: Direct comma-separated user privileges bypass OPNsense MVC read-only write prote
CVE-2026-58393 5.9 MEDIUM OPNsense: OpenVPN Client Specific Override common_name allows path traversal in generated
CVE-2026-58391 5.4 MEDIUM OPNsense: Stored XSS in Firewall Rules/NAT pages via a HTML-attribute breakout
CVE-2026-58392 5.4 MEDIUM OPNsense: Stored XSS in Services: NTP GPS
CVE-2026-58394 5.2 MEDIUM OPNsense: Stored XSS in Administration Settings via Certificate Description
CVE-2026-58395 4.3 MEDIUM OPNsense: XPath injection in MVC safe-delete

IV. Related Vulnerabilities

Same product: core
Same vendor: opnsense
Same weakness: CWE-22

V. Comments for CVE-2026-57155

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