An unauthenticated remote attacker may be able to control the format string of messages processed by the Audit Log of the CODESYS Control runtime system, potentially resulting in a denial‑of‑service (DoS) condition.
CVE-2026-3509
HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence
Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-03-24. a secondary CVSS source baseline 7.5; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: ghsa, secondary
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: —CVSS: 7.5Exploit: None knownExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 7.5
- EG Score
- 7.5(medium)
- EG Risk
- 38(Track)EG Risk 38/100SSVC: Track
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 computedSeverity75% × 45%Exploitation0% × 40%Automatability30% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- —
- EPSS %ILE
- —
- KEV
- Not listed
Published
March 24, 2026
Last Modified
June 17, 2026
References (1)
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 2× in last 7d / 2× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.
- 2026-07-27 14:30 UTCEG score recompute
- 2026-07-27 14:30 UTCGHSA enrichment
Related CVEs(same CWE)
Same CWE
10 shownCWE-134
- CVE-2008-7228EG 10.0HIGH
- CVE-2009-1210EG 10.0EPSS p96HIGH
- CVE-2008-6520EG 10.0EPSS p91HIGH
- CVE-2008-6519EG 10.0EPSS p92HIGH
- CVE-2008-5982EG 10.0EPSS p94HIGH
- CVE-2008-3533EG 10.0EPSS p97HIGH
- CVE-2008-3116EG 10.0EPSS p92HIGH
- CVE-2008-0764EG 10.0EPSS p94HIGH
- CVE-2007-5561EG 10.0EPSS p94HIGH
- CVE-2007-1006EG 10.0HIGH
Frequently asked(4)
What is CVE-2026-3509?
CVE-2026-3509 is a high vulnerability published on March 24, 2026. An unauthenticated remote attacker may be able to control the format string of messages processed by the Audit Log of the CODESYS Control runtime system, potentially resulting in a denial‑of‑service (DoS) condition.
When was CVE-2026-3509 disclosed?
CVE-2026-3509 was first published in the National Vulnerability Database on March 24, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-3509?
CVE-2026-3509 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-3509?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-3509, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-3509
Is Your Infrastructure Affected by CVE-2026-3509?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.