CVE-2026-93573 — Io.netty/netty-codec-http: netty split transfer-encoding fields bypass final-chunked validation and enable request smuggling

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

1. Identify exposed assets running the affected vendor/product/version combinations (Red Hat Build Of Keycloak, Red Hat Red Hat AMQ Broker 7, Red Hat Red Hat AMQ Clients…).
2. The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
3. No fix documented in the sources: reduce exposure and monitor the vendor advisory.
4. Search available logs for exploit probes matching the vulnerability class (injection), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-444 · HTTP Request Smuggling

Other CVEs with this weakness →

EPSS over time FIRST

Oct 13, 2026 → Oct 15, 2026 · 3 reading(s) · max 0.90%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

• Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
• Look for parameters with command/query metacharacters and unexpected child processes of the service.

Timeline

What happened to this CVE, newest first.

• 2026
• Affected products removed · 2
  Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
• Affected products added · red hat/red hat build of keycloak
  Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
• Affected products added · red hat/red hat amq broker 7, red hat/red hat amq clients, red hat/red hat build of apache camel 4 for quarkus 3, red ha
  Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
• SSVC assessment updated
  Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
• Record published
  Oct 13, 2026
• CVSS changed · 6.5
  Oct 13, 2026 · NIST National Vulnerability Database
• Source status changed · → Awaiting Analysis
  Oct 13, 2026 · NIST National Vulnerability Database
• Record created in this database
  Oct 13, 2026 · NIST National Vulnerability Database
• CVE published
  Sep 18, 2026 · redhat

Source activity

Repeated readings are counted rather than listed.

• 2× References added · Oct 15, 2026 – Oct 15, 2026
• 1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

7 on the record

• access.redhat.com/errata/RHSA-2026:83612
  vendor-advisory, x_refsource_REDHAT, NIST National Vulnerability Database
• nvd.nist.gov/vuln/detail/CVE-2026-93573
  GitHub Security Advisories
• access.redhat.com/errata/RHSA-2026:69470
  vendor-advisory, x_refsource_REDHAT, NIST National Vulnerability Database
• access.redhat.com/errata/RHSA-2026:69440
  vendor-advisory, x_refsource_REDHAT, NIST National Vulnerability Database
• github.com/advisories/GHSA-xvf3-842c-j48x
  GitHub Security Advisories
• access.redhat.com/security/cve/CVE-2026-93573
  vdb-entry, x_refsource_REDHAT, NIST National Vulnerability Database
• bugzilla.redhat.com/show_bug.cgi
  issue-tracking, x_refsource_REDHAT, NIST National Vulnerability Database

Elsewhere on this site

Related CVEs (same products)

• High CVE-2026-85634 Wildfly-core: wildfly-core: deployer rbac role privilege escalation via path traversal in deployment name 2h
• Medium CVE-2026-109082 Keycloak-services: keycloak-services: ciba confidential-only contract not enforced for public clients 3d
• Medium CVE-2026-107889 Keycloak-services: keycloak-services: stored xss on login page via kcsanitize bypass 6d
• Medium CVE-2026-107623 Keycloak-services: keycloak-services: oidc dcr read-modify-write silently disables offline token revocation 7d
• Medium CVE-2026-107604 Keycloak-services: keycloak-services: view-clients role allows retrieval of active client secrets via installation provider endpoints 7d
• Medium CVE-2026-107121 Keycloak-services: keycloak-services: smtp starttls plaintext credential and message downgrade 8d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

• No fixed version, patch or mitigation documented.
• No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
• No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
• No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-93573 is "Io.netty/netty-codec-http: netty split transfer-encoding fields bypass final-chunked validation and enable request smuggling", rated Medium. It affects Build Of Keycloak (Red Hat); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 6.5 describes technical severity. EPSS 0.90% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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