CVE-2026-78661 Affecting external-dns-0.21 package, versions <0.21.0-r31
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.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-WOLFILATEST-EXTERNALDNS021-21816667
- published29 Oct 2026
- disclosed27 Oct 2026
Introduced: 27 Oct 2026
NewCVE-2026-78661 (opens in a new tab)How to fix?
Upgrade Wolfi external-dns-0.21 to version 0.21.0-r31 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream external-dns-0.21 package and not the external-dns-0.21 package as distributed by Wolfi.
See How to fix? for Wolfi relevant fixed versions and status.
When coalescing adjacent text nodes in addText and fosterParent, appending to an existing TextNode's Data via string concatenation (n.Data += text) reallocated and copied the accumulated string on every token. Inputs containing many short text runs separated by ignored end tags (such as "a</x>") caused O(n^2) allocations and byte copies. Accumulate coalesced text in per-node byte slices during parsing and materialize Data strings once at the end of parse.