Use After Free Affecting dnsdist package, versions [1.9.0, 1.9.9)
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-UNMANAGED-DNSDIST-10185692
- published20 May 2025
- disclosed29 Apr 2025
- creditCharles Howes
Introduced: 29 Apr 2025
NewCVE-2025-30194 (opens in a new tab)How to fix?
Upgrade dnsdist to version 1.9.9 or higher.
Overview
Affected versions of this package are vulnerable to Use After Free when DNSdist is configured to provide DoH via the nghttp2 provider, an attacker can cause a crash of DNSdist by crafting a DoH exchange that triggers an illegal memory access (double-free).
Note:
This is only exploitable if DNSdist is configured to use the nghttp2 provider as the backend for DoH services.
Workaround
This vulnerability can be avoided temporarily before upgrading by switching to the h2o provider.