Inefficient Algorithmic Complexity Affecting org.typelevel:jawn-parser_2.12 package, versions [,1.7.0)
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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- published24 Sept 2026
- disclosed23 Sept 2026
Introduced: 23 Sep 2026
NewCVE-2026-61814 (opens in a new tab)How to fix?
Upgrade org.typelevel:jawn-parser_2.12 to version 1.7.0 or higher.
Overview
Affected versions of this package are vulnerable to Inefficient Algorithmic Complexity in AsyncParser in parser/shared/src/main/scala/jawn/AsyncParser.scala. An attacker can exhaust CPU by sending untrusted JSON tokens split across many tiny chunks so each absorb call rescans the same incomplete token from the start. This causes parsing of large strings, escaped strings, or numbers to take O(n^2) work, slowing or stalling applications that use AsyncParser on attacker-controlled input.
Workarounds
- Use the synchronous
Parserinstead ofAsyncParser; this avoids the chunk-by-chunk asynchronous parse path that can be driven into repeated rescans and CPU exhaustion. - Buffer incoming bytes into larger chunks before calling
absorb; this reduces the attacker’s ability to split a token across tiny inputs and trigger quadratic parsing work.