Steeltoe is an open source project that provides a collection of libraries that helps users build cloud-native applications. From 4.0.0 until 4.3.0, ConsulDiscoveryClient constructs ConsulServiceInstance objects by parsing each registration's secure metadata with a strict Boolean conversion. A principal that can register a Consul service can supply a secure value other than true or false, causing the exception from one instance to abort construction of the entire instance list and make the targeted service undiscoverable. When GetAllInstancesAsync enumerates all services, one malformed instance can abort enumeration across every service. The outage persists until the offending registration is removed. This issue is fixed in version 4.3.0.
CVE-2026-81516
HIGHPre-NVD 7.57.5—Trending — 3 sources updated this week
EchelonGraph scoreMEDIUM confidence
This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 73% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: epss, 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: 0%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
- 49(Track)EG Risk 49/100SSVC: 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%Automatability100% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- 0%
- EPSS %ILE
- 27%
- KEV
- Not listed
Published
September 17, 2026
Last Modified
September 17, 2026
Advisory Details (3)
Auto-updated Sep 17, 2026Patch available. Sources: github, github_commit, github_release.
github_release Patch Available
4.3.0
Patch available: SteeltoeOSS/Steeltoe 4.3.0
https://github.com/SteeltoeOSS/Steeltoe/releases/tag/4.3.0github_commit Patch Available
commit 028569c4f4f0 (SteeltoeOSS/Steeltoe)
Patch available: SteeltoeOSS/Steeltoe 4.3.0 (contains commit 028569c4f4f0)
https://github.com/SteeltoeOSS/Steeltoe/commit/028569c4f4f0e9e393e3c22a4fa5d07987dd8673github Patch Available
Steeltoe.Discovery.Consul: malformed 'secure' metadata aborts service instance lookup (DoS) · Advisory · SteeltoeOSS/security-advisories · GitHub
https://github.com/SteeltoeOSS/security-advisories/security/advisories/GHSA-67c9-f6v2-qv86Vendor Advisories for CVE-2026-81516(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 7× in last 7d / 7× 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.
- 2026-09-18 22:26 UTCEG score recompute
- 2026-09-18 19:28 UTCEPSS rescore
- 2026-09-17 20:27 UTCEG score recompute
- 2026-09-17 19:30 UTCEG score recompute
- 2026-09-17 17:56 UTCEG score recompute
- 2026-09-17 15:44 UTCEG score recompute
- 2026-09-17 15:44 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
Same CWE
10 shownCWE-755
- CVE-2009-5043EG 9.8CRITICAL
- CVE-2019-17195EG 9.8EPSS p96CRITICAL
- CVE-2019-14431EG 9.8CRITICAL
- CVE-2019-12815EG 9.8EPSS p99CRITICAL
- CVE-2018-19991EG 9.8CRITICAL
- CVE-2017-2877EG 9.8CRITICAL
- CVE-2017-5638EG 9.8 KEVEPSS p100CRITICAL
- CVE-2018-0155NVD 8.6EG 9.0 KEVEPSS p94CRITICAL
- CVE-2019-14287EG 8.9EPSS p99HIGH
- CVE-2019-14378EG 8.8EPSS p97HIGH
Frequently asked(5)
What is CVE-2026-81516?
CVE-2026-81516 is a high vulnerability published on September 17, 2026. Steeltoe is an open source project that provides a collection of libraries that helps users build cloud-native applications. From 4.0.0 until 4.3.0, ConsulDiscoveryClient constructs ConsulServiceInstance objects by parsing each registration's secure metadata with a strict Boolean conversion. A…
When was CVE-2026-81516 disclosed?
CVE-2026-81516 was first published in the National Vulnerability Database on September 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-81516 actively exploited?
CVE-2026-81516 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 72.6% of all scored CVEs.
What is the CVSS score of CVE-2026-81516?
CVE-2026-81516 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-81516?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-81516, 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-2026-81516
Is Your Infrastructure Affected by CVE-2026-81516?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.