CVE-2026-32665

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-07-22. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 5 sources updated this week
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.

In NLnet Labs Unbound 1.22.0 up to and including 1.25.1, when downstream DNS-over-QUIC (DoQ) is enabled, the first two bidirectional streams on a new QUIC connection (stream_id 0 and 4) bypass the per-stream 'quic-size' gate entirely, and large input buffers are allocated later, after only the 2-byte length prefix has been received from the initial streams. As a result, a remote client can make Unbound exceed the configured 'quic-size' limit with low-cost input. Using only one connection and two streams, each sending a declared 65535-byte length prefix and then holding the streams open, a client can already trivially make Unbound roughly allocate double that amount. This is a remote availability issue / memory-accounting bypass in the downstream DoQ implementation that leads to denial of service for new DoQ clients. This vulnerability needs Unbound to be compiled with DoQ support ('--with-libngtcp2') and the 'quic-port' to be configured for the listening interfaces.

CVSS v3
7.5
EG Score
7.5(high)
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 computed
Severity75% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
21%
KEV
Not listed

Published

July 22, 2026

Last Modified

July 24, 2026

Advisory Details (1)

Auto-updated Jul 22, 2026
No patch confirmed yet.
generic
https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-32665.txt

Vendor Advisories for CVE-2026-32665(2)

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 27× in last 7d / 27× 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. 2026-07-27 15:07 UTCEG score recompute
  2. 2026-07-27 15:07 UTCVendor advisory
  3. 2026-07-27 15:07 UTCGHSA enrichment
  4. 2026-07-27 14:13 UTCEPSS rescore
  5. 2026-07-27 02:55 UTCVendor advisory
  6. 2026-07-27 02:55 UTCGHSA enrichment
  7. 2026-07-26 15:12 UTCEG score recompute
  8. 2026-07-26 15:12 UTCVendor advisory
  9. 2026-07-26 15:12 UTCGHSA enrichment
  10. 2026-07-26 14:54 UTCEPSS rescore
  11. 2026-07-26 14:54 UTCEPSS rescore
  12. 2026-07-26 03:29 UTCEG score recompute
  13. 2026-07-26 03:29 UTCVendor advisory
  14. 2026-07-26 03:29 UTCGHSA enrichment
  15. 2026-07-25 14:18 UTCEPSS rescore
  16. 2026-07-25 14:18 UTCEPSS rescore
  17. 2026-07-24 14:17 UTCEPSS rescore
  18. 2026-07-24 14:17 UTCEPSS rescore
  19. 2026-07-23 14:18 UTCEPSS rescore
  20. 2026-07-23 14:18 UTCEPSS rescore
  21. 2026-07-23 03:09 UTCEG score recompute
  22. 2026-07-22 22:04 UTCEG score recompute
  23. 2026-07-22 22:04 UTCGHSA enrichment
  24. 2026-07-22 15:34 UTCEG score recompute
  25. 2026-07-22 15:34 UTCGHSA enrichment
Show 2 more
  1. 2026-07-22 13:19 UTCEG score recompute
  2. 2026-07-22 13:17 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-32665?
CVE-2026-32665 is a high vulnerability published on July 22, 2026. In NLnet Labs Unbound 1.22.0 up to and including 1.25.1, when downstream DNS-over-QUIC (DoQ) is enabled, the first two bidirectional streams on a new QUIC connection (stream_id 0 and 4) bypass the per-stream 'quic-size' gate entirely, and large input buffers are allocated later, after only the…
When was CVE-2026-32665 disclosed?
CVE-2026-32665 was first published in the National Vulnerability Database on July 22, 2026, with the most recent update on July 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-32665 actively exploited?
CVE-2026-32665 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 79.3% of all scored CVEs.
What is the CVSS score of CVE-2026-32665?
CVE-2026-32665 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-32665?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-32665, 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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