CVE-2026-22791
Description
A flaw was found in openCryptoki, a library for cryptographic operations. A local attacker can exploit a heap buffer overflow vulnerability within the CKM_ECDH_AES_KEY_WRAP implementation. By providing a compressed Elliptic Curve (EC) public key and invoking the C_WrapKey function, the attacker can trigger out-of-bounds writes. This can lead to heap corruption and a denial-of-service (DoS) condition, making the application unavailable.
Statement
A local attacker can exploit a heap buffer overflow in openCryptoki's CKM_ECDH_AES_KEY_WRAP implementation, leading to heap corruption and denial of service. This vulnerability has been rated as Moderate by the Red Hat Product security team as, although it may lead to a out-of-bounds write, the impact is limited. When exploiting this vulnerability the attacker has little control over the memory position to be overwritten, additionally the size of the buffer being overwritten is relatively small (around 32 bytes for a P-256 public key for example) making it very difficult to inject any valid payload into memory.
Mitigation
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.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 6.6 | 6.1 | 6.6 |
| Attack Vector | Local | Local | Local |
| Attack Complexity | Low | Low | Low |
| Privileges Required | Low | Low | Low |
| User Interaction | None | None | None |
| Scope | Unchanged | Unchanged | Unchanged |
| Confidentiality | Low | None | Low |
| Integrity Impact | Low | Low | Low |
| Availability Impact | High | High | High |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H
NVD: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
cve.org: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H
Understanding the Weakness (CWE)
Integrity,Availability,Confidentiality
Technical Impact: DoS: Crash, Exit, or Restart; Execute Unauthorized Code or Commands; Read Memory; Modify Memory
If the incorrect calculation is used in the context of memory allocation, then the software may create a buffer that is smaller or larger than expected. If the allocated buffer is smaller than expected, this could lead to an out-of-bounds read or write (CWE-119), possibly causing a crash, allowing arbitrary code execution, or exposing sensitive data.
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