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GHSA-cc4v-rvgp-2pf3

HighCVSS 7.5 / 10
Published Sep 23, 2026·Last modified Sep 23, 2026
Affected Components(3)
Maven logoorg.typelevel/jawn-parser_3
< 1.7.0
Maven logoorg.typelevel/jawn-parser_2.13
< 1.7.0
Maven logoorg.typelevel/jawn-parser_2.12
< 1.7.0
Description

The Jawn parser before 1.6.1 is vulnerable to a denial of service attack via untrusted input.

Impact

A remote attacker who can submit JSON to any jawn-backed parse method can exhaust JVM heap and trigger java.lang.OutOfMemoryError. This is treated by Scala as a fatal error and not typically handled by scala.util.Try or cats.effect.IO.

Patches

Version 1.6.1 introduces a configurable nesting-depth limit (Parser#maxDepth, default 4096). Inputs deeper than the limit fail with a recoverable ParseException instead of exhausting heap.

Users who require deeper nesting may override maxDepth on a Parser subclass.

Workarounds

  • Enforce an input size limit small enough that the resulting context stack cannot exhaust heap, (e.g. http4s EntityLimiter).
  • Pre-scan untrusted input and reject documents whose maximum delimiter nesting exceeds a threshold before handing them to jawn.
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Risk Scores
Base Score
7.5

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the availability of the system.

Threat Intelligence
6.9

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
0.62%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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