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NVD / CVE Program· CNA redhat

CVE-2026-93565: Io.netty/netty-codec-http: netty rtspdecoder method-token smuggling via trailing control byte

Noroxi assessment

Priority: Monitor (action score 30/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.76% (FIRST EPSS); higher than 55.2% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: netty (openSUSE:Tumbleweed) 4.1.138-1.1; netty-tcnative (SUSE:Linux Enterprise Module for Development Tools 15 SP7) 2.0.84-150200.3.51.1; netty (SUSE:Linux Enterprise Module for Package Hub 15 SP7) 4.1.138-150200.4.56.1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to netty (openSUSE:Tumbleweed) 4.1.138-1.1; netty-tcnative (SUSE:Linux Enterprise Module for Development Tools 15 SP7) 2.0.84-150200.3.51.1; netty (SUSE:Linux Enterprise Module for Package Hub 15 SP7) 4.1.138-150200.4.56.1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

A flaw was found in Netty RtspDecoder. The `RtspMethods.valueOf()` function incorrectly strips trailing control bytes from method tokens in Real-Time Streaming Protocol (RTSP) requests. A remote attacker can exploit this by sending a specially crafted RTSP request, leading to method-token smuggling. This vulnerability allows an attacker to bypass method-based access controls and can also be used to launder malicious requests through Netty-based RTSP proxies, making them appear legitimate to backend systems.

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
Sep 18, 2026
Updated
Oct 15, 2026
EPSS
0.7% · 55th percentile

Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.7%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · redhat
7.5
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-93565

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • Red Hat Red Hat AMQ Broker 7

    • all versionsaffected

  • Red Hat Red Hat AMQ Clients

    • all versionsaffected

  • Red Hat Red Hat Build of Apache Camel 3.33.3.SP2

    • 4.1.138.Final-redhat-00001 and laternot affected · rpm

  • Red Hat Red Hat build of Apache Camel 4 for Quarkus 3

    • all versionsaffected

  • Red Hat Red Hat build of Apache Camel for Spring Boot 4

    • all versionsaffected

  • Red Hat Red Hat build of Apicurio Registry 3

    • all versionsaffected

  • Red Hat Red Hat Build of Debezium 3.6

    • all versionsunknown

  • Red Hat Red Hat Build of Keycloak

    • all versionsaffected

  • Red Hat Red Hat build of Quarkus 3.27.5.SP2

    • all versionsunknown

  • Red Hat Red Hat build of Quarkus 3.33.3.SP2

    • all versionsunknown

  • Red Hat Red Hat Data Grid 8

    • all versionsaffected

  • Red Hat Red Hat Fuse 7

    • all versionsunknown

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12nettyfrom 0—
openSUSE:Tumbleweednettybefore 4.1.138-1.14.1.138-1.1
SUSE:Linux Enterprise Module for Development Tools 15 SP7netty-tcnativebefore 2.0.84-150200.3.51.12.0.84-150200.3.51.1
SUSE:Linux Enterprise Module for Package Hub 15 SP7nettybefore 4.1.138-150200.4.56.14.1.138-150200.4.56.1

Same product

red hat: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-93569Io.netty/netty-codec-http2: http/1 absolute-form host mismatch is translated to http/2 :authority, overriding the request-target authority
    33Monitor
  • CVE-2026-101292Artemis-core-client: unsafe reflection in apache activemq artemis federation message deserialization
    32Monitor
  • CVE-2026-84218Org.jolokia/jolokia-core: incomplete jndi denylist in jolokia jsr-160 proxy (bypass of cve-2018-1000130 fix)
    32Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-93558Sep 18, 2026 · Io.netty/netty-codec-http: netty: unbounded per-connection queue growth in websocketserverextensionhandler leads to denial of service
    30Monitor
  • ← EarlierCVE-2026-93564Sep 18, 2026 · Io.netty/netty-codec-haproxy: netty: haproxy proxy-v2 nested-tlv grandchild bytebuf reference-count leak (incomplete fix of pr #16881)
    30Monitor
  • Later →CVE-2026-93566Sep 18, 2026 · Io.netty/netty-codec-http: netty: http request smuggling due to control characters in the chunk-size line
    26Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
opensuse:netty4.1.138-1.1 · openSUSE:TumbleweedPackage registry (OSV)
suse:netty4.1.138-150200.4.56.1 · SUSE:Linux Enterprise Module for Package Hub 15 SP7Package registry (OSV)
suse:netty-tcnative2.0.84-150200.3.51.1 · SUSE:Linux Enterprise Module for Development Tools 15 SP7Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-935580 days apartIo.netty/netty-codec-http: netty: unbounded per-connection queue growth in websocketserverextensionhandler leads to denial of service
    30Monitor
  • CVE-2026-935640 days apartIo.netty/netty-codec-haproxy: netty: haproxy proxy-v2 nested-tlv grandchild bytebuf reference-count leak (incomplete fix of pr #16881)
    30Monitor
  • CVE-2026-935750 days apartIo.netty/netty-codec-mqtt: netty: resource exhaustion in mqttdecoder
    30Monitor
  • CVE-2026-935620 days apartIo.netty/netty-codec-http: netty: incomplete validation of malformed transfer-encoding allows http request smuggling
    26Monitor
  • CVE-2026-935660 days apartIo.netty/netty-codec-http: netty: http request smuggling due to control characters in the chunk-size line
    26Monitor
  • CVE-2026-935790 days apartIo.netty/netty-codec-http2: netty: http/2 header field values are not validated by default (cr/lf/nul passthrough)
    26Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
high · data or configuration can be modified
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
High
Availability impact
None

Weakness class (CWE)

CWE-1035 · OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (5 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records