CVE-2026-18785

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreHIGH confidence

Score 5.3 from GitHub Security Advisory (severity: LOW) published 2026-08-04. a secondary CVSS source baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

A vulnerability was determined in o6 open62541 ca356b088ada7dee824d1b4acd07c1ff07ce242b. Impacted is the function UA_Client_getRemoteDataTypes of the file examples/custom_datatype/client_types_custom.c. Executing a manipulation can lead to use after free. It is possible to launch the attack on the local host. The exploit has been publicly disclosed and may be utilized. The project closed the issue report, stating that this is not the official way to report a security vulnerability.

CVSS v3
5.3
EG Score
5.3(high)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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 computed
Severity53% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
2%
KEV
Not listed

Published

August 4, 2026

Last Modified

August 12, 2026

Advisory Details (2)

Auto-updated Aug 4, 2026
No patch confirmed yet.
generic

open62541 client stack overflow in `UA_Client_getRemoteDataTypes` via unbounded recursive `HasSubtype` traversal · Issue #12 · gff-cw/information · GitHub

https://github.com/gff-cw/information/issues/12
generic

Server-side `heap-use-after-free` in `UA_Subscription_localPublish()` when a local MonitoredItem deletes itself from its callback · Issue #8131 · open62541/open62541 · GitHub

https://github.com/open62541/open62541/issues/8131

Vendor Advisories for CVE-2026-18785(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(2 across 2 ecosystems)
Debian:13(1)
PackageVulnerable rangeFixed inDependents
open625411.4.11.1-1, 1.4.18-1——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
open625411.4.11.1-1, 1.4.18-1——

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 20× in last 7d / 53× 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.

  1. 2026-08-20 22:55 UTCEPSS rescore
  2. 2026-08-20 18:34 UTCGHSA enrichment
  3. 2026-08-19 18:55 UTCEG score recompute
  4. 2026-08-19 18:55 UTCGHSA enrichment
  5. 2026-08-19 17:03 UTCEPSS rescore
  6. 2026-08-18 19:14 UTCEG score recompute
  7. 2026-08-18 19:14 UTCGHSA enrichment
  8. 2026-08-18 13:48 UTCEPSS rescore
  9. 2026-08-17 19:34 UTCEG score recompute
  10. 2026-08-17 19:34 UTCGHSA enrichment
  11. 2026-08-17 13:47 UTCEPSS rescore
  12. 2026-08-16 19:48 UTCEG score recompute
  13. 2026-08-16 19:48 UTCGHSA enrichment
  14. 2026-08-16 14:56 UTCEPSS rescore
  15. 2026-08-16 02:14 UTCEPSS rescore
  16. 2026-08-15 20:09 UTCEG score recompute
  17. 2026-08-15 20:09 UTCGHSA enrichment
  18. 2026-08-15 01:30 UTCEPSS rescore
  19. 2026-08-14 20:29 UTCEG score recompute
  20. 2026-08-14 20:29 UTCGHSA enrichment
  21. 2026-08-13 22:00 UTCEPSS rescore
  22. 2026-08-13 20:47 UTCGHSA enrichment
  23. 2026-08-12 21:08 UTCGHSA enrichment
  24. 2026-08-12 15:56 UTCEG score recompute
  25. 2026-08-12 15:56 UTCGHSA enrichment
Show 28 more
  1. 2026-08-12 13:50 UTCEPSS rescore
  2. 2026-08-11 16:17 UTCEG score recompute
  3. 2026-08-11 16:17 UTCGHSA enrichment
  4. 2026-08-11 13:42 UTCEPSS rescore
  5. 2026-08-11 00:00 UTCEPSS rescore
  6. 2026-08-10 16:37 UTCGHSA enrichment
  7. 2026-08-09 16:40 UTCEG score recompute
  8. 2026-08-09 16:40 UTCGHSA enrichment
  9. 2026-08-09 13:46 UTCEPSS rescore
  10. 2026-08-08 17:01 UTCEG score recompute
  11. 2026-08-08 17:01 UTCGHSA enrichment
  12. 2026-08-08 16:37 UTCEPSS rescore
  13. 2026-08-07 17:22 UTCEG score recompute
  14. 2026-08-07 17:22 UTCGHSA enrichment
  15. 2026-08-06 17:43 UTCEG score recompute
  16. 2026-08-06 17:43 UTCGHSA enrichment
  17. 2026-08-06 13:46 UTCEPSS rescore
  18. 2026-08-05 19:17 UTCEPSS rescore
  19. 2026-08-05 18:04 UTCEG score recompute
  20. 2026-08-05 18:04 UTCGHSA enrichment
  21. 2026-08-04 18:25 UTCEG score recompute
  22. 2026-08-04 18:23 UTCNVD updateCVSS v4 → 1.9
  23. 2026-08-04 17:59 UTCEG score recompute
  24. 2026-08-04 17:46 UTCMITRE cvelistV5CVSS v4 → 4.8
  25. 2026-08-04 17:23 UTCEG score recompute
  26. 2026-08-04 17:23 UTCNVD updateCVSS v4 → 1.9
  27. 2026-08-04 17:07 UTCEG score recompute
  28. 2026-08-04 17:06 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-18785?
CVE-2026-18785 is a medium vulnerability published on August 4, 2026. A vulnerability was determined in o6 open62541 ca356b088ada7dee824d1b4acd07c1ff07ce242b. Impacted is the function UAClientgetRemoteDataTypes of the file examples/customdatatype/clienttypes_custom.c. Executing a manipulation can lead to use after free. It is possible to launch the attack on the…
When was CVE-2026-18785 disclosed?
CVE-2026-18785 was first published in the National Vulnerability Database on August 4, 2026, with the most recent update on August 12, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18785 actively exploited?
CVE-2026-18785 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 98.4% of all scored CVEs.
What is the CVSS score of CVE-2026-18785?
CVE-2026-18785 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-18785?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18785, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-18785

Explore →

Is Your Infrastructure Affected by CVE-2026-18785?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs