CVE-2023-4043: Parsson DoS when parsing numbers from untrusted sources

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2023-11-03 · updated 2026-06-17
Weakness: CWE-20

Description

In Eclipse Parsson before versions 1.1.4 and 1.0.5, Parsing JSON from untrusted sources can lead malicious actors to exploit the fact that the built-in support for parsing numbers with large scale in Java has a number of edge cases where the input text of a number can lead to much larger processing time than one would expect. To mitigate the risk, parsson put in place a size limit for the numbers as well as their scale.

Affected products

Eclipse Foundation Parsson: before 1.0.5; from 1.1.0 before 1.1.4 — fixed in 1.0.5, 1.1.4

How to fix

Upgrade to a fixed version: Eclipse Foundation Parsson 1.0.5, 1.1.4. Check the vendor advisory for mitigations.

References

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