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major vulnerability· requires attention

Netty is a widely used Java networking framework; this flaw can bypass proxies/gateways and affect many enterprise services.

Networks

CVE-2026-93569

8.2
High
EPSS 2%Patch available

Netty HTTP/1→HTTP/2 authority mismatch allows bypass, cache poisoning, misrouting

exploited
No known exploitation not in CISA KEV as of our last sync
fix
Patch available see the advisory in the references
likelihood
EPSS 2.2%top 18% of scored CVEs
Published 18 Sept 2026Analysed here 21 Sept 2026CVSS scored by the publisher (CNA)
common questions

Is CVE-2026-93569 being exploited?

Not confirmed. CVE-2026-93569 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 2.2% probability of exploitation in the next 30 days.

How severe is CVE-2026-93569?

CVE-2026-93569 is rated High with a CVSS score of 8.2. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.

Is there a patch for CVE-2026-93569?

Yes. A fix has been recorded for CVE-2026-93569. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.

What does CVE-2026-93569 affect?

CVE-2026-93569 affects Netty (HTTP/2 conversion modules), Netty-based proxies/gateways, Applications using Netty HTTP stack. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.

What should I do about CVE-2026-93569?

Apply vendor updates or mitigations; normalize Host/:authority handling and block conflicting requests

Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.

executive summary
technical analysis
affected
Netty (HTTP/2 conversion modules)Netty-based proxies/gatewaysApplications using Netty HTTP stack
impact

Remote unauthenticated attackers can bypass proxy controls, cause cache poisoning, or misroute requests by exploiting Host vs request-target authority mismatch.

action required

Immediate action required

cisa ssvc

exploitation
none
automatable
yes
technical impact
partial

Assessed by CISA 22 Sept 2026 (SSVC 2.0.3).

timeline

  1. 18 Sept 2026Published
  2. 21 Sept 2026Analysed by vulneraibility.com · 3 days later
  3. 22 Sept 2026CISA SSVC assessment: exploitation none · 1 day later
  4. 19 Oct 2026CVE record last updated · 27 days later
how to fix
Remediation steps are tailored for users whose stack is affected. Add this technology to your stack to see the fix checklist.
references
NVDCVE.orgCVE DetailsSource
6 references in the CVE record: 4 advisories, 2 links

sources

  • CVE List (CVE.org): description, affected versions, references; CVE Terms of Use
  • NVD: CVSS and CPE data
  • CISA Vulnrichment (ADP): SSVC decision points
  • FIRST EPSS: exploit probability and percentile
  • Summary, impact and triage tags: written by our AI analysis pipeline from the sources above. Check them against the sources.
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