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.
CVE-2026-57155
This critical-severity CVE scores 9.9 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.9% (57th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.
- CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
The CVE record names the fixed release — apply it.
- CVSS v3
- 9.9
- EG Score
- 9.9CRITICALlow confidence
- EG Risk
- 61EG Risk 61/100
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computed (value × EchelonGraph’s weight)Severity99% × 45%The EG Score, 9.9 of 10.Exploitation40% × 40%EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.Automatability0% × 15%CISA's SSVC Automatable value: no (Vulnrichment).SSVC (CISA's decision table, applied by EchelonGraph): Track at low, Track* at medium and Attend at high mission impact.Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.Action: The CVE record names the fixed release. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high. - EPSS PROB
- 0.9%
- EPSS %ILE
- 57th
- KEV
- Not listed
SSVC (CISA's decision table, applied by EchelonGraph)Track at low, Track* at medium and Attend at high mission impact.
The CVE record names the fixed release. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table
BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.
In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it
Published
October 15, 2026
Last Modified
October 15, 2026
Advisory Details (4)
Auto-updated Oct 16, 2026Root RCE via Arbitrary File Write in GeoIP Alias Importer · Advisory · opnsense/core · GitHub
https://github.com/opnsense/core/security/advisories/GHSA-wjqq-rfmm-v5h3Chasing the OPNsense RCE: The Story Behind My First CVEs (CVE-2026-57155) | HackerAsk
https://hackerask.com/posts/opnsensecommit e7fbfaa7f5e0 (opnsense/core)
Fix landed in opnsense/core commit e7fbfaa7f5e0 — awaiting tagged release
https://github.com/opnsense/core/commit/e7fbfaa7f5e070da667e3f243da11fd3d4b731facommit c46aced9c47d (opnsense/core)
Fix landed in opnsense/core commit c46aced9c47d — awaiting tagged release
https://github.com/opnsense/core/commit/c46aced9c47d956167e294911113bc334fea5f48Weakness Classification(3)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 5× in last 7d / 5× in last 30d)
Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.
- 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.9% · 57th percentile
- 2026-10-15 16:29 UTCEG score recompute
- 2026-10-15 15:50 UTCEG score recompute
- 2026-10-15 15:23 UTCEG score recomputeFirst assessed: 9.9 CRITICAL
- 2026-10-15 15:22 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
Same CWE
10 shownCWE-22 · CWE-78 · CWE-73
Frequently asked(5)
What is CVE-2026-57155?
When was the CVE record for CVE-2026-57155 published?
Is CVE-2026-57155 actively exploited?
What is the CVSS score of CVE-2026-57155?
How do I remediate CVE-2026-57155?
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-57155
Is Your Infrastructure Affected by CVE-2026-57155?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.