Is CVE-2026-95155 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-95155 being exploited in the wild.

How severe is CVE-2026-95155?

High severity, with a CVSS score of 7.5, published 15 October 2026.

Which products and versions are affected?

FasterXML Jackson-Mapper-Asl 1.8.3, 1.9.2, 1.9.11, 1.9.12, 1.9.13 and likely other 1.x versions.

Is there a fix for CVE-2026-95155?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-95155 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-95155?

Check whether you run FasterXML Jackson-Mapper-Asl at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-95155: FasterXML jackson-mapper-asl stack overflow from deeply nested JSON

CVE-2026-95155 · Severity: high · CVSS 7.5 · Published 2026-10-15

FasterXML Jackson is a JSON parsing library used in Java applications to convert JSON data into objects. An attacker can exploit a vulnerability by supplying deeply nested JSON input to cause a denial of service through uncontrolled stack overflow, crashing the application and disrupting service availability without triggering normal exception handling.

Vendors: FasterXML.

Quick answers

Is CVE-2026-95155 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-95155 being exploited in the wild.
How severe is CVE-2026-95155?: High severity, with a CVSS score of 7.5, published 15 October 2026.
Which products and versions are affected?: FasterXML Jackson-Mapper-Asl 1.8.3, 1.9.2, 1.9.11, 1.9.12, 1.9.13 and likely other 1.x versions.
Is there a fix for CVE-2026-95155?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-95155 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-95155?: Check whether you run FasterXML Jackson-Mapper-Asl at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

Jackson 1.x lacks configurable limits on JSON nesting depth; when ObjectMapper.readValue() processes deeply nested JSON arrays or objects, it recursively exhausts the JVM thread stack and throws java.lang.StackOverflowError instead of a catchable JsonProcessingException. This occurs with small-volume but deeply nested input (4000+ levels) and affects services parsing untrusted network input that only catch normal JSON exceptions.

Affected products

FasterXML jackson-mapper-asl 1.8.3, 1.9.2, 1.9.11, 1.9.12, 1.9.13 and likely other 1.x versions

Timeline

2026-10-15: disclosed

References

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