CVE-2026-29062
jackson-core has Nesting Depth Constraint Bypass in `UTF8DataInputJsonParser` potentially allowing Resource Exhaustion
Impact
### Summary The `UTF8DataInputJsonParser`, which is used when parsing from a `java.io.DataInput` source, bypasses the `maxNestingDepth` constraint (default: 500) defined in `StreamReadConstraints`. A similar issue was found in `ReaderBasedJsonParser`. This allows a user to supply a JSON document with excessive nesting, which can cause a `StackOverflowError` when the structure is processed, leading to a Denial of Service (DoS). The related fix for com.fasterxml.jackson.core:jackson-core, CVE-2025-52999, was not fully applied to tools.jackson.core:jackson-core until the 3.1.0 release. It is recommended that 3.0.x users upgrade. ### Patches jackson-core contains a configurable limit for how deep Jackson will traverse in an input document. This check was missing in a few places in tools.jackson.core:jackson-core. The change is in https://github.com/FasterXML/jackson-core/pull/1554. jackson-core will throw a StreamConstraintsException if the limit is reached. jackson-databind also benefits from this change because it uses jackson-core to parse JSON inputs. ### Workarounds Users should avoid parsing input files from untrusted sources. ### Resources [GHSA-6v53-7c9g-w56r](https://github.com/FasterXML/jackson-core/security/advisories/GHSA-6v53-7c9g-w56r) https://nvd.nist.gov/vuln/detail/CVE-2025-52999 https://github.com/FasterXML/jackson-core/pull/1554
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| maven | tools.jackson.core:jackson-core | >= 3.0.0, < 3.1.0 | 3.1.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Fasterxml | Jackson-Core | from 3.0.0 before 3.1.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/FasterXML/jackson-core/commit/8b25fd67f20583e75fb09564ce1eaab06cd5a902
- https://github.com/FasterXML/jackson-core/pull/1554
- https://github.com/FasterXML/jackson-core/security/advisories/GHSA-6v53-7c9g-w56r
- https://access.redhat.com/security/cve/CVE-2026-29062
- https://bugzilla.redhat.com/show_bug.cgi?id=2445135
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-29062.json
- https://github.com/advisories/GHSA-6v53-7c9g-w56r
- https://github.com/FasterXML/jackson-core/security/advisories/GHSA-h46c-h94j-95f3
- https://nvd.nist.gov/vuln/detail/CVE-2025-52999
- https://nvd.nist.gov/vuln/detail/CVE-2026-29062