[UPDATE] [high] Unbound: Multiple vulnerabilities

CSIRTS triage

What

Multiple vulnerabilities allow an attacker to cause a denial of service state, potentially execute code, and cause unspecified impacts.

Who is affected

Deployments of Unbound are affected by these vulnerabilities.

Urgency

Remediation is urgent due to the high severity of the vulnerabilities, although they have not been exploited yet.

Action

Update Unbound to the latest version to mitigate these vulnerabilities.

AI-assisted analysis generated from the source advisory — verify against the original.

Details

Source

CERT-Bund (BSI) Security Advisories (DE · national-cert · site)

Severity

high

Published

2026-07-10

Exploitation

Not in CISA KEV at last sync

Language

Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-1599

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

• Moderate exploitation riskCVE-2026-332781.3% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 66% of all scored CVEs.
• Low exploitation riskCVE-2026-327920.34% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 26% of all scored CVEs.
• Low exploitation riskCVE-2026-406220.17% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 7% of all scored CVEs.
• Low exploitation riskCVE-2026-412920.56% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 42% of all scored CVEs.
• Low exploitation riskCVE-2026-425340.52% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 40% of all scored CVEs.
• Low exploitation riskCVE-2026-429230.34% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 26% of all scored CVEs.
• Low exploitation riskCVE-2026-429440.84% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 54% of all scored CVEs.
• Low exploitation riskCVE-2026-429590.78% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 52% of all scored CVEs.
• Low exploitation riskCVE-2026-429600.25% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 16% of all scored CVEs.
• Low exploitation riskCVE-2026-443900.56% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 42% of all scored CVEs.

Referenced CVEs

Recent advisories for Unbound

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

• highGHSA-h69g-9hx6-f3v4: Excelize: Unbounded Row Index Allocation in Worksheet Parser (checkSheet OOM/Panic DoS)ghsa · 2026-07-10
• mediumCVE-2026-8609: An unauthenticated attacker can repeatedly call Grafana's OAuth login route with unique values,…nvd · 2026-07-10
• highGHSA-g586-ccqf-7x4r: mint: Unbounded streams map growth via PUSH_PROMISE without follow-up HEADERSghsa · 2026-07-09
• highGHSA-2p26-p43x-fhp8: mint: Unbounded CONTINUATION/HEADERS frame accumulation (CONTINUATION flood)ghsa · 2026-07-09
• mediumGHSA-c2f9-4mc8-j656: pyLoad: Unbounded Memory Growth Leading to DoS and Potential DDoS in EventManagerghsa · 2026-07-09
• highCVE-2026-31984: A denial-of-service vulnerability caused by unbounded resource allocation was discovered in th…nvd · 2026-07-09

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