CVE-2026-61547
Description
A flaw was found in rabbitmq-c. When serializing an oversized message frame, the library copies payload data into the outbound buffer without verifying that the data fits within the allocated memory. An attacker who can supply an oversized body frame to an application using this library can trigger a heap-based buffer overflow, potentially resulting in memory corruption or an application crash leading to a Denial of Service (DoS).
Statement
This vulnerability is rated as an Important severity flaw because an application utilizing librabbitmq to send externally supplied data could be forced into a heap corruption state, potentially permitting remote code execution or application crashes. In standard Red Hat Enterprise Linux environments, librabbitmq acts as a client library, meaning exploitation relies on a consuming application transmitting unbounded or untrusted payload sizes without prior validation. Because triggering the flaw requires specific application-level handling of oversized messages rather than default client behavior, successful exploitation depends heavily on the surrounding application logic and memory layout.
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 | 8.1 | N/A | 9.8 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | High | N/A | Low |
| Privileges Required | None | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | High | N/A | High |
| Integrity Impact | High | N/A | High |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
cve.org: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Understanding the Weakness (CWE)
Integrity
Technical Impact: Modify Memory; Execute Unauthorized Code or Commands
Write operations could cause memory corruption. In some cases, an adversary can modify control data such as return addresses in order to execute unexpected code.
Availability
Technical Impact: DoS: Crash, Exit, or Restart
Attempting to access out-of-range, invalid, or unauthorized memory could cause the product to crash.
Other
Technical Impact: Unexpected State
Subsequent write operations can produce undefined or unexpected results.
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