CVE-2026-82717

HIGHPre-NVD 8.48.4—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.4 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 66% 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 — 5 sources updated this week
8.4EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.4Exploit: None knownExposed: 0

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

In NLnet Labs Unbound up to and including 1.26.0, a vulnerability was found in that can progressively corrupt heap memory and under certain systems and compilation options could lead to remote code execution. The vulnerability starts when CNAME synthesis during an upstream response needs to enforce(rewrite) a max TTL value in the packet buffer. Coupled with a compression pointer that points to the overwritten value and invalidates the domain name, it leads to an error path that does not properly move the buffer position and allows for the heap buffer overflow. Since this is heavily reliant on heap memory layout, results are memory corruption that eventually leads to a crash and under specific systems and compilation options remote code execution.

CVSS v3
8.4
EG Score
8.4(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 computed
Severity84% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
34%
KEV
Not listed

Published

September 16, 2026

Last Modified

September 16, 2026

Advisory Details (1)

Auto-updated Sep 16, 2026
No patch confirmed yet.
generic
https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-82717.txt

Vendor Advisories for CVE-2026-82717(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.

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 33× in last 7d / 33× 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. 2026-09-21 06:14 UTCEG score recompute
  2. 2026-09-21 06:14 UTCVendor advisory
  3. 2026-09-21 06:14 UTCGHSA enrichment
  4. 2026-09-20 20:16 UTCEPSS rescore
  5. 2026-09-20 18:25 UTCVendor advisory
  6. 2026-09-20 18:25 UTCGHSA enrichment
  7. 2026-09-20 06:36 UTCVendor advisory
  8. 2026-09-20 06:36 UTCGHSA enrichment
  9. 2026-09-19 18:40 UTCEG score recompute
  10. 2026-09-19 18:40 UTCVendor advisory
  11. 2026-09-19 18:40 UTCGHSA enrichment
  12. 2026-09-19 06:50 UTCEG score recompute
  13. 2026-09-19 06:50 UTCVendor advisory
  14. 2026-09-19 06:50 UTCGHSA enrichment
  15. 2026-09-18 19:28 UTCEPSS rescore
  16. 2026-09-18 19:01 UTCVendor advisory
  17. 2026-09-18 19:01 UTCGHSA enrichment
  18. 2026-09-18 07:12 UTCEG score recompute
  19. 2026-09-18 07:12 UTCVendor advisory
  20. 2026-09-18 07:12 UTCGHSA enrichment
  21. 2026-09-17 19:23 UTCVendor advisory
  22. 2026-09-17 19:23 UTCGHSA enrichment
  23. 2026-09-17 07:34 UTCVendor advisory
  24. 2026-09-17 07:34 UTCGHSA enrichment
  25. 2026-09-16 19:45 UTCGHSA enrichment
Show 8 more
  1. 2026-09-16 15:25 UTCEG score recompute
  2. 2026-09-16 15:25 UTCGHSA enrichment
  3. 2026-09-16 14:26 UTCEG score recompute
  4. 2026-09-16 14:26 UTCGHSA enrichment
  5. 2026-09-16 14:08 UTCEPSS rescore
  6. 2026-09-16 09:30 UTCEG score recompute
  7. 2026-09-16 08:42 UTCEG score recompute
  8. 2026-09-16 08:41 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-82717?
CVE-2026-82717 is a high vulnerability published on September 16, 2026. In NLnet Labs Unbound up to and including 1.26.0, a vulnerability was found in that can progressively corrupt heap memory and under certain systems and compilation options could lead to remote code execution. The vulnerability starts when CNAME synthesis during an upstream response needs to…
When was CVE-2026-82717 disclosed?
CVE-2026-82717 was first published in the National Vulnerability Database on September 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-82717 actively exploited?
CVE-2026-82717 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 65.8% of all scored CVEs.
What is the CVSS score of CVE-2026-82717?
CVE-2026-82717 has a CVSS v3 base score of 8.4 (NVD).
How do I remediate CVE-2026-82717?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-82717, 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

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