Описание
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.
Отчет
Red Hat Product Security rates this vulnerability as Moderate severity because exploitation requires a specialized server setup where RSA key exchange is negotiated using a private key hosted on a PKCS#11 token. In standard Red Hat Enterprise Linux deployments, system-wide crypto policies prioritize forward-secret (EC)DHE cipher suites, and PKCS#11 hardware tokens are not configured by default. Furthermore, the issue only triggers a bounded heap overread, resulting in limited information disclosure rather than arbitrary code execution.
Меры по смягчению последствий
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 6 | gnutls | Out of support scope | ||
| Red Hat Enterprise Linux 7 | gnutls | Not affected | ||
| Red Hat OpenShift Container Platform 4 | openshift4/ose-hypershift-rhel9 | Not affected | ||
| Red Hat OpenShift Container Platform 5 | openshift/ose-rhel-coreos-9 | Affected | ||
| Red Hat Enterprise Linux 10 | gnutls | Fixed | RHSA-2026:20613 | 26.05.2026 |
| Red Hat Enterprise Linux 10.0 Extended Update Support | gnutls | Fixed | RHSA-2026:26409 | 16.06.2026 |
| Red Hat Enterprise Linux 8 | gnutls | Fixed | RHSA-2026:20611 | 26.05.2026 |
| Red Hat Enterprise Linux 8 | gnutls | Fixed | RHSA-2026:20611 | 26.05.2026 |
| Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | gnutls | Fixed | RHSA-2026:33125 | 29.06.2026 |
| Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | libtasn1 | Fixed | RHSA-2026:33125 | 29.06.2026 |
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Дополнительная информация
Статус:
EPSS
8.2 High
CVSS3
Связанные уязвимости
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.
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.
Gnutls: gnutls: information disclosure via heap overread in rsa key exchange
A flaw was found in libgnutls. A remote attacker, by sending an extrem ...
EPSS
8.2 High
CVSS3