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GHSA-w4cm-gvhj-cgw6
org.typelevel/jawn-parser_3org.typelevel/jawn-parser_2.13org.typelevel/jawn-parser_2.12AsyncParser can be forced to perform O(n^2) work on the length of the input. When a single JSON token arrives across many small chunks, each absorb call rescans the incomplete token from the start.
Impact
Denial of service via CPU exhaustion when parsing untrusted JSON.
Preconditions:
- Application uses
AsyncParser - Attacker can send large tokens with control over chunk sizes.
Patches
Fixed in jawn-parser-1.7.0.
Workarounds
If you can't upgrade immediately:
- Use the synchronous
Parser. - Buffer incoming bytes into larger chunks before calling
absorb
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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.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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