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GHSA-vc89-hccf-rq55

MediumCVSS 5.9 / 10
Published Jan 6, 2022·Last modified Dec 16, 2025
Affected Components(0)

No affected components available

Description

Impact

Extenders of the org.typelevel.jawn.SimpleFacade and org.typelevel.jawn.MutableFacade who don't override objectContext() are vulnerable to a hash collision attack. Most applications do not implement these traits directly, but inherit from a library:

Affected implementations include:

  • org.http4s :: http4s-play-json
  • org.typelevel :: jawn-ast (< 0.8.0)
  • org.typelevel :: jawn-play (discontinued)
  • org.typelevel :: jawn-rojoma (discontinued)
  • org.typelevel :: jawn-spray (discontinued)

Unaffected implementations include:

  • io.argonaut :: argonaut-jawn
  • io.circe :: circe-parser
  • org.typelevel :: jawn-ast (>= 0.8.0)
  • org.typelevel :: jawn-json4s (discontinued)
  • org.typelevel :: jawn-argonaut (discontinued)

Patches

jawn-parser-1.3.2 fixes the issue.

Workarounds

Override objectContext() to use a collision-safe collection. See the patch for an example in both SimpleFacade and MutableFacade.

References

  • https://github.com/typelevel/jawn/pull/390

Credits

  • @kag0, for the report and the patch

For more information

If you have any questions or comments about this advisory:

Risk Scores
Base Score
5.9

The vulnerability can be exploited over the network without needing physical access. It is difficult for an attacker to exploit this vulnerability and may require special conditions. 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
5.4

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

EPSS
0.79%

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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