CVE-2025-68131
Description
A flaw was found in cbor2. When a CBORDecoder instance is reused across multiple decode operations, values marked with the shareable tag (28) persist in memory. This allows an attacker-controlled message to read sensitive data from previously decoded messages if the decoder is reused across trust boundaries, leading to information disclosure.
Statement
This vulnerability is rated Moderate for Red Hat products. The flaw in cbor2 allows information disclosure if a CBORDecoder instance is reused across trust boundaries. This could lead to an attacker-controlled message reading sensitive data from previously decoded messages. This affects Red Hat AI Inference Server, Red Hat Enterprise Linux AI, and Red Hat OpenShift AI when processing untrusted CBOR data with a reused decoder.
Mitigation
To mitigate this issue, applications utilizing the `cbor2` library should avoid reusing `CBORDecoder` instances when processing data from different trust levels. If `CBORDecoder` reuse is unavoidable, ensure that sensitive data is not processed by a decoder instance that will subsequently handle untrusted input. This operational control prevents an attacker from accessing prior decoded information.
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).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.3 | 7.5 | N/A |
| Attack Vector | Network | Network | N/A |
| Attack Complexity | Low | Low | N/A |
| Privileges Required | None | None | N/A |
| User Interaction | None | None | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | Low | High | N/A |
| Integrity Impact | None | None | N/A |
| Availability Impact | None | None | N/A |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
NVD: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Understanding the Weakness (CWE)
Confidentiality
Technical Impact: Read Files or Directories; Read Application Data
Sensitive data may be exposed to an unauthorized actor in another control sphere. This may have a wide range of secondary consequences that will depend on what data is exposed. One possibility is the exposure of system data - such as file locations, software versions, or device data - that allow an attacker to craft a specific, more effective attack. Alternately, insufficient redaction of Private Personal Information (PPI), Personally Identifiable Information (PII), or other types of information might not harm the secure operation of the product itself, but could be violations of expectations by the product's users.
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