CVE-2026-69186

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5%, top 58% 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
Trending — 4 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: 1%CVSS: 5.3Exploit: Elevated riskExposed: 0

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

c-ares is an asynchronous resolver library. Prior to 1.34.7, ares_dns_parse() trusts the attacker-controlled ANCOUNT, NSCOUNT, and ARCOUNT fields before confirming that the DNS response contains enough bytes for the claimed records. Because process_answer() invokes parsing before transaction ID and question validation, a malicious DNS response can cause ares_dns_record_rr_prealloc() and ares_array_set_size() to reserve disproportionate heap memory for a tiny message. Repeated responses create large allocation and release cycles that can degrade or deny name resolution, without causing memory corruption or information disclosure. This issue is fixed in version 1.34.7.

CVSS v3
5.3
EG Score
5.3(medium)
EG Risk
55(Attend)
EG Risk 55/100SSVC: Attend

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%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
1%
EPSS %ILE
42%
KEV
Not listed

Published

September 18, 2026

Last Modified

September 23, 2026

Advisory Details (5)

Auto-updated Sep 18, 2026
🔬 Proof of concept available. Patch available. Sources: github_release, github, github_pr, github_commit.
github_release Patch Available

1.34.7

Patch available: c-ares/c-ares v1.34.7

https://github.com/c-ares/c-ares/releases/tag/v1.34.7
github_commit

commit eaded4cb200b (c-ares/c-ares)

Fix landed in c-ares/c-ares commit eaded4cb200b — awaiting tagged release

https://github.com/c-ares/c-ares/commit/eaded4cb200b2a5f8d73f11021ff7c8d6968aaab
github_commit Patch Available

commit e47c203f91cd (c-ares/c-ares)

Patch available: c-ares/c-ares v1.34.7 (contains commit e47c203f91cd)

https://github.com/c-ares/c-ares/commit/e47c203f91cd8b749c8736bc18d75a31ffdec8f4
github_pr

validate RR counts before preallocation to reject malformed packets early

Fix merged in c-ares/c-ares PR #1134 on 2026-04-12 — awaiting tagged release

https://github.com/c-ares/c-ares/pull/1134
github Patch Available🟡 PoC Available

Memory-amplification denial of service via unvalidated DNS header record counts · Advisory · c-ares/c-ares · GitHub

https://github.com/c-ares/c-ares/security/advisories/GHSA-jv8r-gqr9-68wj

Weakness Classification(1)

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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 16× in last 7d / 16× 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. 2026-09-24 18:19 UTCEG score recompute
  2. 2026-09-24 18:19 UTCVendor advisory
  3. 2026-09-23 18:27 UTCEG score recompute
  4. 2026-09-23 18:27 UTCVendor advisory
  5. 2026-09-23 17:54 UTCEPSS rescore
  6. 2026-09-22 19:57 UTCEG score recompute
  7. 2026-09-22 19:57 UTCVendor advisory
  8. 2026-09-21 21:09 UTCEPSS rescore
  9. 2026-09-21 20:06 UTCEG score recompute
  10. 2026-09-20 20:16 UTCEPSS rescore
  11. 2026-09-19 20:23 UTCEG score recompute
  12. 2026-09-18 20:31 UTCEG score recompute
  13. 2026-09-18 19:59 UTCEG score recompute
  14. 2026-09-18 18:27 UTCEG score recompute
  15. 2026-09-18 17:29 UTCEG score recompute
  16. 2026-09-18 17:29 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-69186?
CVE-2026-69186 is a medium vulnerability published on September 18, 2026. c-ares is an asynchronous resolver library. Prior to 1.34.7, aresdnsparse() trusts the attacker-controlled ANCOUNT, NSCOUNT, and ARCOUNT fields before confirming that the DNS response contains enough bytes for the claimed records. Because processanswer() invokes parsing before transaction ID and…
When was CVE-2026-69186 disclosed?
CVE-2026-69186 was first published in the National Vulnerability Database on September 18, 2026, with the most recent update on September 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-69186 actively exploited?
CVE-2026-69186 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 58.1% of all scored CVEs.
What is the CVSS score of CVE-2026-69186?
CVE-2026-69186 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-69186?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-69186, 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.

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