EUVD-2026-32009CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Lifecycle Timeline
2DescriptionNVD
A flaw was found in libgnutls. A remote attacker, by sending an extremely short premaster secret during an RSA key exchange to a server using an RSA key backed by a PKCS#11 token, could trigger a short heap overread. This memory corruption vulnerability could lead to information disclosure.
AnalysisAI
Information disclosure and denial of service in GnuTLS (libgnutls) let a remote, unauthenticated attacker trigger a heap overread against TLS servers that perform legacy RSA key exchange using a private key backed by a PKCS#11 token. By sending an abnormally short premaster secret, the attacker causes the library to read beyond an allocated buffer (CWE-1284), which can leak a small amount of adjacent heap memory and, per the CVSS vector, more strongly impacts availability (A:H). …
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RemediationAI
Within 24 hours: Identify all GnuTLS deployments in production and determine which use legacy RSA key exchange with PKCS#11 token-backed private keys; assess whether affected services are Internet-facing. Within 7 days: Implement compensating controls by disabling legacy RSA key exchange in favor of modern mechanisms (ECDHE, DHE); deploy connection rate limiting on TLS ports; segment network access to affected services. …
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