Heap Overread Vulnerability in GnuTLS Affecting Specific RSA Key Implementations
CVE-2026-5260
8.2HIGH
Key Information:
- Vendor
Red Hat
- Status
- Vendor
- CVE Published:
- 26 May 2026
What is CVE-2026-5260?
A vulnerability has been identified in GnuTLS where a remote attacker may exploit a flaw during an RSA key exchange process. By sending a specially crafted extremely short premaster secret to a server that utilizes an RSA key backed by a PKCS#11 token, it is possible to initiate a short heap overread. This type of memory corruption may allow an attacker to gain unauthorized access to sensitive information, posing a significant risk to affected systems.
Affected Version(s)
Red Hat Enterprise Linux 10 0:3.8.10-4.el10_2
Red Hat Enterprise Linux 10.0 Extended Update Support 0:3.8.9-9.el10_0.19
Red Hat Enterprise Linux 8 0:3.6.16-8.el8_10.6
References
CVSS V3.1
Score:
8.2
Severity:
HIGH
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged
Timeline
Vulnerability published
Vulnerability Reserved
Credit
Red Hat would like to thank Joshua Rogers (AISLE Research Team) for reporting this issue.