CVE-2026-90560
Description
A flaw was found in zstd-jni. This vulnerability, an out-of-bounds read, occurs in the ZstdDictDecompress constructor due to insufficient validation of offset and length arguments against dictionary array bounds. A remote attacker could exploit this by providing specially crafted input, leading to memory being read beyond its allocated buffer. This could result in the termination of the Java Virtual Machine (JVM), causing a denial of service.
Statement
Red Hat has determined that affected versions of zstd-jni are vulnerable to an out-of-bounds read in the ZstdDictDecompress constructor. An attacker who can cause an application to supply invalid dictionary offset or length values may terminate the Java Virtual Machine, resulting in denial of service. Red Hat is tracking fixes for affected products.
Mitigation
Until a fixed update is available, applications should validate that dictionary offset and length values are non-negative and that the requested range does not exceed the dictionary array. Apply product updates containing zstd-jni 1.5.7-14 or a Red Hat backport of the fix when available.
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 | 8.2 | N/A | 8.2 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | None | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | Low | N/A | Low |
| Integrity Impact | None | N/A | None |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Understanding the Weakness (CWE)
Confidentiality
Technical Impact: Read Memory
An attacker could get secret values such as cryptographic keys, PII, memory addresses, or other information that could be used in additional attacks.
Confidentiality
Technical Impact: Bypass Protection Mechanism
Out-of-bounds memory could contain memory addresses or other information that can be used to bypass ASLR and other protection mechanisms in order to improve the reliability of exploiting a separate weakness for code execution.
Availability
Technical Impact: DoS: Crash, Exit, or Restart
An attacker could cause a segmentation fault or crash by causing memory to be read outside of the bounds of the buffer. This is especially likely when the code reads a variable amount of data and assumes that a sentinel exists to stop the read operation, such as a NUL in a string.
Other
Technical Impact: Varies by Context
The read operation could produce other undefined or unexpected results.
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