CVE-2026-34183

Issue summary: Remote peer may exhaust heap memory of the QUIC server or client by flooding it with packets containing PATH_CHALLENGE frames. Impact summary: A malicious remote peer can cause an unbounded memory allocation which can lead to an abnormal termination of the application acting as a QUIC client or server and a Denial of Service. A remote peer may exhaust heap memory by flooding the local QUIC stack with PATH_CHALLENGE frames. The local QUIC stack allocates a PATH_RESPONSE frame for every PATH_CHALLENGE it receives. The allocated PATH_RESPONSE frame gets freed only when the remote peer acknowledges reception of the PATH_RESPONSE frame which will not be done by a malicious peer. The FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this issue. The QUIC stack is outside of OpenSSL FIPS module boundary.

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/openssl/openssl/commit/5b306efb0b3779dfdd0803b4afc9d08c91f11517	Patch
https://github.com/openssl/openssl/commit/7d06955ebe0ecf8adfd4c1e92018586da47ef9ac	Patch
https://github.com/openssl/openssl/commit/d2e9efbe4900a373227deb136e8665401404ffac	Patch
https://github.com/openssl/openssl/commit/fbaa83859c01ad64f497b757aaf51be7d05ed9eb	Patch
https://openssl-library.org/news/secadv/20260609.txt	Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:openssl:openssl::::::::
	cpe:2.3:a:openssl:openssl::::::::
	cpe:2.3:a:openssl:openssl::::::::
	cpe:2.3:a:openssl:openssl:4.0.0:-::::::

History

No history.

Information

Published : 2026-06-09 17:17

Updated : 2026-07-23 08:10

NVD link : CVE-2026-34183

Mitre link : CVE-2026-34183

CVE.ORG link : CVE-2026-34183

JSON object : View

Products Affected

openssl

openssl

CWE

CWE-1325

Improperly Controlled Sequential Memory Allocation

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The local QUIC stack\nallocates a PATH_RESPONSE frame for every PATH_CHALLENGE it receives.\nThe allocated PATH_RESPONSE frame gets freed only when the remote\npeer acknowledges reception of the PATH_RESPONSE frame which will\nnot be done by a malicious peer.\n\nThe FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by\nthis issue. The QUIC stack is outside of OpenSSL FIPS module\nboundary."}, {"lang": "es", "value": "Resumen del problema: Un par remoto puede agotar la memoria del mont\u00f3n del servidor o cliente QUIC inund\u00e1ndolo con paquetes que contienen tramas PATH_CHALLENGE.\n\nResumen del impacto: Un par remoto malicioso puede causar una asignaci\u00f3n de memoria ilimitada que puede llevar a una terminaci\u00f3n anormal de la aplicaci\u00f3n que act\u00faa como cliente o servidor QUIC y a una denegaci\u00f3n de servicio.\n\nUn par remoto puede agotar la memoria del mont\u00f3n inundando la pila QUIC local con tramas PATH_CHALLENGE. La pila QUIC local asigna una trama PATH_RESPONSE por cada PATH_CHALLENGE que recibe. La trama PATH_RESPONSE asignada se libera solo cuando el par remoto acusa recibo de la trama PATH_RESPONSE, lo cual no ser\u00e1 hecho por un par malicioso.\n\nLos m\u00f3dulos FIPS en 4.0, 3.6, 3.5, 3.4 y 3.0 no se ven afectados por este problema. La pila QUIC est\u00e1 fuera del l\u00edmite del m\u00f3dulo FIPS de OpenSSL."}], "lastModified": "2026-07-23T08:10:00.137", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "BF7E21E7-AEC0-4882-B1F1-2D056B506F22", "versionEndExcluding": "3.4.6", "versionStartIncluding": "3.4.0"}, {"criteria": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "6B6B9930-C549-4D88-9784-AF32CCDDB87A", "versionEndExcluding": "3.5.7", "versionStartIncluding": "3.5.0"}, {"criteria": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D41B3C45-EC73-4DC8-989D-B2E2792E102F", "versionEndExcluding": "3.6.3", "versionStartIncluding": "3.6.0"}, {"criteria": "cpe:2.3:a:openssl:openssl:4.0.0:-:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "6E881B9A-1A0A-4BC0-8160-20C00561167D"}], "operator": "OR"}]}], "sourceIdentifier": "openssl-security@openssl.org"}