What is CVE-2022-3433?

CVE-2022-3433 is a medium-severity vulnerability in Haskell Aeson, classified under Use of Weak Hash. CVSS score: 6.5/10. Published 2022-10-10.

How severe is CVE-2022-3433?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Haskell Aeson

CVE-2022-3433

The aeson library is not safe to use to consume untrusted JSON input. A remote user could abuse this flaw to produce a hash collision in the underlying unordered-containers library by sending specially crafted JSON data, resulting in a denial of service.

Published 2022-10-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.008 (53.7th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 53.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.008 · change: +0.000

Affected products

Haskell Aeson
Aeson — versions Fixed in 2.0.1.0

Weakness classification (CWE)

References

cs-syd.eu/posts/2021-09-11-json-vulnerability (Technical Description, Exploit, Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2022-3433?: CVE-2022-3433 is a medium-severity vulnerability in Haskell Aeson, classified under Use of Weak Hash. CVSS score: 6.5/10. Published 2022-10-10.
How severe is CVE-2022-3433?: Medium severity. CVSS v3 base score is 6.5 out of 10.