Description
FasterXML Jackson 1.x, confirmed in jackson-mapper-asl versions 1.8.3, 1.9.2, 1.9.11, 1.9.12, and 1.9.13, allows attackers to cause a denial of service by supplying deeply nested JSON input to an application that deserializes untrusted JSON using ObjectMapper.readValue.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | libjackson-json-java | No fix yet | — |
| Ubuntu 26.04 LTS | libjackson-json-java | No fix yet | — |
| Ubuntu 24.04 LTS | libjackson-json-java | No fix yet | — |
| Ubuntu 22.04 LTS | libjackson-json-java | No fix yet | — |
| Ubuntu 20.04 LTS | libjackson-json-java | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | libjackson-json-java | No fix yet | — |
| Ubuntu 16.04 LTS | libjackson-json-java | No fix yet | — |
| Ubuntu Pro 14.04 LTS | libjackson-json-java | No fix yet | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | jackson +1 | 1.9.4-7.amzn2.0.1 | ALAS2-2026-4098 |
Advisories 2
- WID-SEC-2026-4003 FasterXML Jackson: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Nov 12, 2026
- ALAS2-2026-4098 Important: jackson security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Nov 12, 2026