fix(auto): limit regex length#7737
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A very large regex for the auto plugin in the Corefile could cause CoreDNS to OOM. This change adds an artificial limit of 10k characters for the regex pattern. Fixes OSS-Fuzz finding #466745384. Signed-off-by: Ville Vesilehto <ville@vesilehto.fi>
yongtang
approved these changes
Dec 8, 2025
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1. Why is this pull request needed and what does it do?
A very large regex for the auto plugin in the Corefile could cause CoreDNS to OOM. This change adds an artificial limit of 10k characters for the regex pattern.
2. Which issues (if any) are related?
Fixes OSS-Fuzz finding #466745384 (not publicly accessible).
3. Which documentation changes (if any) need to be made?
Added a note to plugin README.
4. Does this introduce a backward incompatible change or deprecation?
The limit is supposed to be abundantly high to cover any and all real use cases.