Vulnerability-Lookup

CVE-2026-93565 (GCVE-0-2026-93565)

Vulnerability from cvelistv5 – Published: 2026-09-18 14:18 – Updated: 2026-09-18 20:22

Title

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

Summary

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.

Severity

7.5 (High)


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

CWE

CWE-1035

Assigner

redhat redhat root

References

2 references

URL	Tags
https://access.redhat.com/security/cve/CVE-2026-93565	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2536952	issue-trackingx_refsource_REDHAT

Impacted products

13 products

Vendor	Product	Version
Red Hat	Red Hat AMQ Broker 7	cpe:/a:redhat:amq_broker:7
Red Hat	Red Hat AMQ Clients	cpe:/a:redhat:amq_clients:2023
Red Hat	Red Hat build of Apache Camel 4 for Quarkus 3	cpe:/a:redhat:camel_quarkus:3
Red Hat	Red Hat build of Apache Camel for Spring Boot 4	cpe:/a:redhat:camel_spring_boot:4
Red Hat	Red Hat build of Apicurio Registry 3	cpe:/a:redhat:apicurio_registry:3
Red Hat	Red Hat build of Debezium 3	cpe:/a:redhat:debezium:3
Red Hat	Red Hat Build of Keycloak	cpe:/a:redhat:build_keycloak:
Red Hat	Red Hat build of Quarkus	cpe:/a:redhat:quarkus:3
Red Hat	Red Hat Data Grid 8	cpe:/a:redhat:jboss_data_grid:8
Red Hat	Red Hat Fuse 7	cpe:/a:redhat:jboss_fuse:7
Red Hat	Red Hat JBoss Enterprise Application Platform 7	cpe:/a:redhat:jboss_enterprise_application_platform:7
Red Hat	Red Hat JBoss Enterprise Application Platform 8	cpe:/a:redhat:jboss_enterprise_application_platform:8
Red Hat	Red Hat Single Sign-On 7	cpe:/a:redhat:red_hat_single_sign_on:7

Date Public

2026-09-10 00:47

Show details on NVD website

JSON

To clipboard

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GHSA-6F4P-H3XM-C8RC

Vulnerability from github – Published: 2026-09-18 15:32 – Updated: 2026-09-18 21:32

Details

Summary

RtspMethods.valueOf() silently strips trailing control bytes (any character with code point <= 0x20, the full range that String.trim() removes) before performing a cache lookup against its ten pre-populated method constants. A wire-delivered RTSP request whose method token ends with a trailing control byte — for example PLAY\x00 or PLAY\r, immediately before the separating space — is decoded by RtspDecoder as a fully successful PLAY request, with decoderResult().isSuccess() == true and request.method() == RtspMethods.PLAY (same object reference as the cached singleton). The application layer cannot distinguish this from a clean PLAY request.

This is the same root cause as #16723 and #16971, in a sibling that those fixes did not reach. The fix for HttpMethod hardened HttpMethod.valueOf() directly, but RtspMethods.valueOf() has its own independent checkNonEmptyAfterTrim() call that runs before the cache lookup — meaning a trailing-control-byte token hits the cache before the hardened HttpMethod constructor ever sees it.

Reproduction

Minimal wire-level reproduction

Send the following raw bytes to any Netty-based RTSP server using R

Severity

7.5 (High)


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

Show details on source website

JSON

To clipboard

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  ],
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    "severity": "HIGH"
  },
  "details": "### Summary\n`RtspMethods.valueOf()` silently strips trailing control bytes (any character with code point \u003c= 0x20, the full range that `String.trim()` removes) before performing a cache lookup against its ten pre-populated method constants. A wire-delivered RTSP request whose method token ends with a trailing control byte \u2014 for example `PLAY\\x00` or `PLAY\\r`, immediately before the separating space \u2014 is decoded by `RtspDecoder` as a fully successful PLAY request, with `decoderResult().isSuccess() == true and request.method() == RtspMethods.PLAY` (same object reference as the cached singleton). The application layer cannot distinguish this from a clean\n`PLAY` request.\n\nThis is the same root cause as #16723 and #16971, in a sibling that those fixes did not reach. The fix for `HttpMethod` hardened `HttpMethod.valueOf()` directly, but `RtspMethods.valueOf()` has its own independent `checkNonEmptyAfterTrim()` call that runs before the cache lookup \u2014 meaning a trailing-control-byte token hits the cache before the hardened `HttpMethod` constructor ever sees it.\n\n### Reproduction\n\nMinimal wire-level reproduction\n\nSend the following raw bytes to any Netty-based RTSP server using R",
  "id": "GHSA-6f4p-h3xm-c8rc",
  "modified": "2026-09-18T21:32:19Z",
  "published": "2026-09-18T15:32:20Z",
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    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93565"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/security/cve/CVE-2026-93565"
    },
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      "type": "CVSS_V3"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-93565 (GCVE-0-2026-93565)

GHSA-6F4P-H3XM-C8RC

Summary

Reproduction

Tags

Sightings

Nomenclature

Related by attack behaviour