Use After Free Affecting c-ares package, versions [1.32.3,1.34.5)
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-CONAN-CARES-10185672
- published20 May 2025
- disclosed8 Apr 2025
- creditErik Lax
Introduced: 8 Apr 2025
CVE-2025-31498 (opens in a new tab)How to fix?
Upgrade c-ares to version 1.34.5 or higher.
Overview
Affected versions of this package are vulnerable to Use After Free due to the read_answers process by flooding the target with ICMP UNREACHABLE packets under specific network conditions.
Note: This is only exploitable remotely if the attacker also controls the upstream nameserver and can return a result that triggers the re-enqueue of a query. Otherwise only a local attacker might be able to change system behavior to make send() or write() return a failure condition.