CVE-2026-87823
Description
A flaw was found in zstd-jni. This vulnerability arises from insufficient bounds checks in direct-ByteBuffer frame-size native methods, which allows attackers to provide negative or overflowing offsets. A remote attacker can exploit this by supplying specially crafted negative offset values, leading to out-of-bounds memory reads. This can result in the termination of the Java Virtual Machine (JVM), causing a Denial of Service (DoS), or the disclosure of sensitive information by extracting arbitrary frame size data from unintended memory locations.
Statement
An out-of-bounds read flaw was found in zstd-jni. Versions before 1.5.7-14 perform insufficient bounds validation in direct ByteBuffer frame-size native methods. An attacker who can provide crafted input with negative or overflowing offsets may cause the JVM to terminate or disclose data from unintended memory locations.
Mitigation
Update zstd-jni to version 1.5.7-14 or later. If an update is not immediately possible, do not pass attacker-controlled buffers or offsets to the affected frame-size methods. Validate offsets and lengths before invoking zstd-jni native methods.
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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