Memory Allocation with Excessive Size Value Affecting net-imap package, versions <0.2.5>=0.3.0, <0.3.9>=0.4.0, <0.4.20>=0.5.0, <0.5.7
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-RUBY-NETIMAP-10006666
- published4 May 2025
- disclosed28 Apr 2025
- creditMasamune
Introduced: 28 Apr 2025
NewCVE-2025-43857 (opens in a new tab)How to fix?
Upgrade net-imap to version 0.2.5, 0.3.9, 0.4.20, 0.5.7 or higher.
Overview
Affected versions of this package are vulnerable to Memory Allocation with Excessive Size Value in the ResponseReader class. An attacker can cause the application to allocate excessive memory and trigger a denial of service by including "literal" strings in responses sent to client-initiated connections and IMAP commands.
After implementing the fix, the default max_response_size is still high (512MiB) to accommodate backward compatibility. It is recommended to set a lower max_response_size if connecting to untrusted servers or using insecure connections.