CVE-2026-32314

Yamux is a stream multiplexer over reliable, ordered connections such as TCP/IP. Prior to 0.13.10, the Rust implementation of Yamux can panic when processing a crafted inbound Data frame that sets SYN and uses a body length greater than DEFAULT_CREDIT (e.g. 262145). On the first packet of a new inbound stream, stream state is created and a receiver is queued before oversized-body validation completes. When validation fails, the temporary stream is dropped and cleanup may call remove(...).expect("stream not found"), triggering a panic in the connection state machine. This is remotely reachable over a normal Yamux session and does not require authentication. This vulnerability is fixed in 0.13.10.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/libp2p/rust-yamux/security/advisories/GHSA-vxx9-2994-q338	Exploit Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:protocol:yamux:*:*:*:*:*:rust:*:*

History

No history.

Information

Published : 2026-03-16 14:19

Updated : 2026-03-19 14:30

NVD link : CVE-2026-32314

Mitre link : CVE-2026-32314

CVE.ORG link : CVE-2026-32314

JSON object : View

Products Affected

protocol

yamux

CWE

CWE-248

Uncaught Exception

{"id": "CVE-2026-32314", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}], "cvssMetricV40": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 8.7, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "HIGH", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "NONE", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "published": "2026-03-16T14:19:34.030", "references": [{"url": "https://github.com/libp2p/rust-yamux/security/advisories/GHSA-vxx9-2994-q338", "tags": ["Exploit", "Vendor Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-248"}]}], "descriptions": [{"lang": "en", "value": "Yamux is a stream multiplexer over reliable, ordered connections such as TCP/IP. Prior to 0.13.10, the Rust implementation of Yamux can panic when processing a crafted inbound Data frame that sets SYN and uses a body length greater than DEFAULT_CREDIT (e.g. 262145). On the first packet of a new inbound stream, stream state is created and a receiver is queued before oversized-body validation completes. When validation fails, the temporary stream is dropped and cleanup may call remove(...).expect(\"stream not found\"), triggering a panic in the connection state machine. This is remotely reachable over a normal Yamux session and does not require authentication. This vulnerability is fixed in 0.13.10."}, {"lang": "es", "value": "Yamux es un multiplexor de flujo sobre conexiones fiables y ordenadas como TCP/IP. Antes de la versi\u00f3n 0.13.10, la implementaci\u00f3n en Rust de Yamux puede entrar en p\u00e1nico al procesar un marco de datos de entrada manipulado que establece SYN y utiliza una longitud de cuerpo mayor que DEFAULT_CREDIT (p. ej., 262145). En el primer paquete de un nuevo flujo de entrada, se crea el estado del flujo y se encola un receptor antes de que se complete la validaci\u00f3n del cuerpo de tama\u00f1o excesivo. Cuando la validaci\u00f3n falla, el flujo temporal se descarta y la limpieza puede llamar a remove(...).expect('stream not found'), lo que desencadena un p\u00e1nico en la m\u00e1quina de estados de la conexi\u00f3n. Esto es accesible remotamente a trav\u00e9s de una sesi\u00f3n Yamux normal y no requiere autenticaci\u00f3n. Esta vulnerabilidad se corrige en la versi\u00f3n 0.13.10."}], "lastModified": "2026-03-19T14:30:43.087", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:protocol:yamux:*:*:*:*:*:rust:*:*", "vulnerable": true, "matchCriteriaId": "85CB9FF6-BE41-4864-86B3-E85803159E91", "versionEndExcluding": "0.13.10"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}