CVE-2026-18938
MediumCVSS 6.2Exploitation Probability (EPSS)
Low risk1th percentile - higher than 1% of all known CVEs
Summary
An integer overflow vulnerability was found in p11-kit. A local attacker, or one with access to a reachable RPC channel, can send specially crafted messages to cause miscalculated memory allocation for nested attributes. This leads to a heap out-of-bounds write, crashing the p11-kit RPC parsing process and resulting in a Denial of Service (DoS). The vulnerability is only exploitable on 32-bit systems.
Risk Assessment
An attacker can crash the p11-kit service, causing unavailability for legitimate users. In 32-bit environments, the risk is real, especially in embedded or legacy systems.
Recommendation
Update p11-kit to the latest patched version. If possible, restrict access to the RPC channel to trusted entities only.
Other vulnerabilities in p11-kit
See all- CVE-2026-13757Medium
A flaw was found in p11-kit where the RPC message attribute parsing functions lack recursion depth limits when processing nested template attributes. An unauthenticated attacker with local access to the Unix domain socket can send a crafted request causing stack exhaustion and crashing the p11-kit server and its dependent services.
- CVE-2026-2100Medium
A flaw was found in p11-kit where a remote attacker could call the C_DeriveKey function on a remote token with specific IBM kyber or IBM btc derive mechanism parameters set to NULL. This could lead to the RPC-client attempting to return an uninitialized value, potentially resulting in a NULL dereference or undefined behavior.
Original NVD description (English source)
A flaw was found in p11-kit. A local attacker, or one with equivalent access to a reachable RPC channel, could exploit an integer overflow vulnerability. By sending specially crafted messages, the attacker can cause the system to miscalculate memory allocation for nested attributes. This leads to a memory corruption issue, specifically a heap out-of-bounds write, which can crash the p11-kit RPC parsing process, resulting in a Denial of Service (DoS). This vulnerability is only exploitable on 32 bit systems.