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High

jackson-databind has an array subtype allowlist bypass in BasicPolymorphicTypeValidator (allowIfSubTypeIsArray)

  • Disclosed: 23.06.2026
  • Updated: 11.10.2026 13:20

Summary

BasicPolymorphicTypeValidator.Builder.allowIfSubTypeIsArray() allowlists any array type based only on clazz.isArray(), without validating the array's component (element) type against the configured allowlist. A PTV built with allowIfSubTypeIsArray() plus an explicit concrete-type allowlist therefore still permits EvilType[] even though EvilType is not allowlisted. When Jackson deserializes the elements and no per-element type IDs are present, it instantiates the component type directly with no further PTV check, bypassing the allowlist.

Impact

Applications using BasicPolymorphicTypeValidator with allowIfSubTypeIsArray() as a safeguard get no protection for concrete array component types; an attacker controlling JSON can instantiate non-allowlisted types via an array wrapper, re-opening the gadget-instantiation risk PTV is meant to prevent.

Affected / Patched (verified via git tag --contains)

  • 2.18 line: >= 2.10.0, < 2.18.8 -> fixed in 2.18.8
  • 2.19-2.21 line: >= 2.19.0, < 2.21.4 -> fixed in 2.21.4
  • 3.x line: >= 3.0.0, < 3.1.4 -> fixed in 3.1.4

PolymorphicTypeValidator was added in 2.10.0 so vulnerability N/A for versions prior to that.

Severity / CWE

Maintainer: significant. Reporter: HIGH. CWE-184 (Incomplete List of Disallowed Inputs); related CWE-502.

Upstream fix

FasterXML/jackson-databind#5981; fix PR #5983 (24529da), 2.18 backport PR #5984 (01d1692). Released 2026-06-04 in 2.18.8 / 2.21.4 / 3.1.4.

Credits

Omkhar Arasaratnam (@omkhar) - finder.

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
Java / Kotlin (Maven) com.fasterxml.jackson.core:jackson-databind >= 2.10.0, < 2.18.8, >= 2.19.0, < 2.21.4, >= 3.0.0, < 3.1.4 2.18.8, 2.21.4, 3.1.4
Java / Kotlin (Maven) tools.jackson.core:jackson-databind >= 3.0.0, < 3.1.4 3.1.4

References

CVSS score 8.1/10
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE)
CWE-184
Platform
Java / Kotlin (Maven)
Package
com.fasterxml.jackson.core:jackson-databind, tools.jackson.core:jackson-databind
Disclosed
23.06.2026
Updated
11.10.2026 13:20

Sources and licenses

OSV / GitHub Advisory Database - GHSA-rmj7-2vxq-3g9f - CC BY 4.0

Vulnerability history: com.fasterxml.jackson.core:jackson-databind

All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (86) in the archive
Total entries
86
First → latest
10.2018 09.2026
Without a fix
0
Exploited in attacks
0

Severity breakdown

  • Critical 24
  • High 48
  • Medium 14

Disclosures per year

Severity:
  1. jackson-databind quadratic forward-reference completion
    High · 7.5 CVE-2026-91777 >= 2.19.0, < 2.21.7, >= 2.5.0, < 2.18.11, >= 2.22.0, < 2.22.3 2.21.7, 2.18.11, 2.22.3
  2. jackson-databind retains every unknown raw type ID
    High · 7.5 CVE-2026-91776 >= 2.0.0, < 2.18.11, >= 2.19.0, < 2.21.7, >= 2.22.0, < 2.22.3 2.18.11, 2.21.7, 2.22.3
  3. jackson-databind: Duration XMLGregorianCalendar Unbounded Number Parse DoS
    High · 7.5 CVE-2026-68497 >= 2.14.0, < 2.18.10, >= 2.19.0, < 2.21.6, >= 2.22.0, < 2.22.2 2.18.10, 2.21.6, 2.22.2
  4. jackson-databind has an array subtype allowlist bypass in BasicPolymorphicTypeValidator (allowIfSubTypeIsArray) this entry
    High · 8.1 CVE-2026-54513 >= 2.10.0, < 2.18.8, >= 2.19.0, < 2.21.4, >= 3.0.0, < 3.1.4 2.18.8, 2.21.4, 3.1.4
  5. jackson-databind has a PolymorphicTypeValidator bypass via generic type parameters that allows arbitrary class instantiation
    High · 8.1 CVE-2026-54512 >= 2.10.0, < 2.18.8, >= 3.0.0, < 3.1.4, >= 2.19.0, < 2.21.4 2.18.8, 3.1.4, 2.21.4
  6. jackson-databind possible Denial of Service if using JDK serialization to serialize JsonNode
    High · 7.5 CVE-2021-46877 >= 2.10.0, < 2.12.6, >= 2.13.0, < 2.13.1 2.12.6, 2.13.1
  7. Uncontrolled Resource Consumption in Jackson-databind
    High · 7.5 CVE-2022-42003 >= 2.4.0-rc1, < 2.12.7.1, >= 2.13.0, < 2.13.4.2 2.12.7.1, 2.13.4.2
  8. Uncontrolled Resource Consumption in FasterXML jackson-databind
    High · 7.5 CVE-2022-42004 >= 2.4.0-rc1, < 2.12.7.1, >= 2.13.0, < 2.13.4 2.12.7.1, 2.13.4
  9. jackson-databind vulnerable to unsafe deserialization
    High · 8.1 CVE-2020-10650 < 2.9.10.4 2.9.10.4
  10. Deeply nested json in jackson-databind
    High · 7.5 CVE-2020-36518 >= 2.13.0, < 2.13.2.1, < 2.12.6.1 2.13.2.1, 2.12.6.1
  11. Unsafe Deserialization in jackson-databind
    High · 8.1 CVE-2020-36189 >= 2.7.0, < 2.9.10.8, < 2.6.7.5 2.9.10.8, 2.6.7.5
  12. Unsafe Deserialization in jackson-databind
    High · 8.1 CVE-2020-36187 >= 2.0.0, < 2.9.10.8 2.9.10.8
  13. Unsafe Deserialization in jackson-databind
    High · 8.1 CVE-2020-36188 >= 2.7.0, < 2.9.10.8, >= 2.0.0, < 2.6.7.5 2.9.10.8, 2.6.7.5
  14. Unsafe Deserialization in jackson-databind
    High · 8.1 CVE-2020-36183 >= 2.7.00, < 2.9.10.8, >= 2.0.0, < 2.6.7.5 2.9.10.8, 2.6.7.5
  15. Unsafe Deserialization in jackson-databind
    High · 8.1 CVE-2020-36184 >= 2.0.0, < 2.9.10.8 2.9.10.8
  16. Unsafe Deserialization in jackson-databind
    High · 8.1 CVE-2020-36180 >= 2.7.0, < 2.9.10.8, >= 2.0.0, < 2.6.7.5 2.9.10.8, 2.6.7.5
  17. Unsafe Deserialization in jackson-databind
    High · 8.1 CVE-2020-36181 >= 2.7.0, < 2.9.10.8, >= 2.0.0, < 2.6.7.5 2.9.10.8, 2.6.7.5
  18. Unsafe Deserialization in jackson-databind
    High · 8.1 CVE-2020-36185 >= 2.0.0, < 2.9.10.8 2.9.10.8
  19. Unsafe Deserialization in jackson-databind
    High · 8.1 CVE-2020-36179 >= 2.7.0, < 2.9.10.8, >= 2.0.0, < 2.6.7.5 2.9.10.8, 2.6.7.5
  20. Unsafe Deserialization in jackson-databind
    High · 8.1 CVE-2020-36182 >= 2.7.0, < 2.9.10.8, >= 2.0.0, < 2.6.7.5 2.9.10.8, 2.6.7.5
  21. Unsafe Deserialization in jackson-databind
    High · 8.1 CVE-2020-24750 >= 2.0, < 2.6.7.5, >= 2.7.0, < 2.9.10.6 2.6.7.5, 2.9.10.6
  22. Serialization gadget exploit in jackson-databind
    High · 8.1 CVE-2020-35728 >= 2.0.0, < 2.9.10.8 2.9.10.8
  23. Serialization gadgets exploit in jackson-databind
    High · 8.1 CVE-2020-35491 >= 2.0.0, < 2.9.10.8 2.9.10.8
  24. Serialization gadgets exploit in jackson-databind
    High · 8.1 CVE-2020-35490 >= 2.0.0, < 2.9.10.8 2.9.10.8
  25. Code Injection in jackson-databind
    High · 8.1 CVE-2020-24616 >= 2.0.0, < 2.9.10.6 2.9.10.6
  26. Unsafe Deserialization in jackson-databind
    High · 8.1 CVE-2020-36186 >= 2.0.0, < 2.9.10.8 2.9.10.8
  27. XML External Entity (XXE) Injection in Jackson Databind
    High · 7.5 CVE-2020-25649 >= 2.6.0, < 2.6.7.4, >= 2.7.0.0, < 2.9.10.7, >= 2.10.0.0, < 2.10.5.1 2.6.7.4, 2.9.10.7, 2.10.5.1
  28. Deserialization of untrusted data in jackson-databind
    High · 8.1 CVE-2021-20190 >= 2.7.0, < 2.9.10.7, < 2.6.7.5 2.9.10.7, 2.6.7.5
  29. Deserialization of Untrusted Data in jackson-databind
    High · 8.1 CVE-2018-5968 >= 2.8.0, < 2.8.11.1, >= 2.9.0, < 2.9.4, < 2.7.9.5 2.8.11.1, 2.9.4, 2.7.9.5
  30. Deserialization of untrusted data in Jackson Databind
    High · 8.1 CVE-2020-14061 >= 2.9.0, < 2.9.10.5 2.9.10.5
  31. Deserialization of untrusted data in Jackson Databind
    High · 8.1 CVE-2020-14062 >= 2.9.0, < 2.9.10.5 2.9.10.5
  32. Deserialization of untrusted data in Jackson Databind
    High · 8.1 CVE-2020-14060 >= 2.9.0, < 2.9.10.5 2.9.10.5
  33. Deserialization of untrusted data in Jackson Databind
    High · 8.1 CVE-2020-14195 >= 2.9.0, < 2.9.10.5 2.9.10.5
  34. Deserialization of Untrusted Data
    High · 7.5 CVE-2018-12023 >= 2.7.0, < 2.7.9.4, >= 2.8.0, < 2.8.11.2, >= 2.9.0, < 2.9.6 2.7.9.4, 2.8.11.2, 2.9.6
  35. Improper Input Validation in jackson-databind
    Critical · 9.8 CVE-2019-17267 >= 2.9.0, < 2.9.10, < 2.8.11.5 2.9.10, 2.8.11.5
  36. jackson-databind mishandles the interaction between serialization gadgets and typing
    High · 8.8 CVE-2020-11112 >= 2.9.0, < 2.9.10.4 2.9.10.4
  37. jackson-databind mishandles the interaction between serialization gadgets and typing
    Critical · 9.8 CVE-2020-9547 >= 2.9.0, < 2.9.10.4, >= 2.8.0, < 2.8.11.6, >= 2.0.0, < 2.7.9.7 2.9.10.4, 2.8.11.6, 2.7.9.7
  38. Polymorphic deserialization of malicious object in jackson-databind
    High CVE-2019-14893 >= 2.9.0, < 2.9.10 2.9.10
  39. jackson-databind mishandles the interaction between serialization gadgets and typing
    High · 8.8 CVE-2020-10673 >= 2.7.0, < 2.9.10.4, >= 2.0.0, < 2.6.7.4 2.9.10.4, 2.6.7.4
  40. jackson-databind mishandles the interaction between serialization gadgets and typing
    Critical · 9.8 CVE-2020-9548 >= 2.9.0, < 2.9.10.4, >= 2.8.0, < 2.8.11.6, >= 2.0.0, < 2.7.9.7 2.9.10.4, 2.8.11.6, 2.7.9.7
  41. Polymorphic deserialization of malicious object in jackson-databind
    High · 7.5 CVE-2019-14892 < 2.6.7.3, >= 2.7.0, < 2.8.11.5, >= 2.9.0, < 2.9.10 2.6.7.3, 2.8.11.5, 2.9.10
  42. jackson-databind mishandles the interaction between serialization gadgets and typing
    High · 8.8 CVE-2020-10968 >= 2.9.0, < 2.9.10.4 2.9.10.4
  43. jackson-databind mishandles the interaction between serialization gadgets and typing
    High · 8.8 CVE-2020-11111 >= 2.9.0, < 2.9.10.4 2.9.10.4
  44. jackson-databind mishandles the interaction between serialization gadgets and typing
    High · 8.8 CVE-2020-11113 >= 2.9.0, < 2.9.10.4 2.9.10.4
  45. jackson-databind mishandles the interaction between serialization gadgets and typing
    High · 8.1 CVE-2020-11619 >= 2.9.0, < 2.9.10.4 2.9.10.4
  46. jackson-databind mishandles the interaction between serialization gadgets and typing
    High · 8.8 CVE-2020-10969 >= 2.9.0, < 2.9.10.4 2.9.10.4
  47. jackson-databind mishandles the interaction between serialization gadgets and typing
    Critical · 9.8 CVE-2020-9546 >= 2.9.0, < 2.9.10.4 2.9.10.4
  48. jackson-databind mishandles the interaction between serialization gadgets and typing
    High · 8.1 CVE-2020-11620 >= 2.9.0, < 2.9.10.4 2.9.10.4
  49. jackson-databind mishandles the interaction between serialization gadgets and typing
    High · 8.8 CVE-2020-10672 >= 2.9.0, < 2.9.10.4 2.9.10.4
  50. Deserialization of Untrusted Data in jackson-databind
    Critical · 9.8 CVE-2020-8840 >= 2.0.0, < 2.6.7.4, >= 2.7.0, < 2.7.9.7, >= 2.8.0, < 2.8.11.5, >= 2.9.0, < 2.9.10.3 2.6.7.4, 2.7.9.7, 2.8.11.5, 2.9.10.3
  51. Deserialization of Untrusted Data in jackson-databind
    Critical · 9.8 CVE-2019-20330 >= 2.0.0, < 2.6.7.4, >= 2.7.0, < 2.7.9.7, >= 2.8.0, < 2.8.11.5, >= 2.9.0, < 2.9.10.2 2.6.7.4, 2.7.9.7, 2.8.11.5, 2.9.10.2
  52. jackson-databind polymorphic typing issue
    Critical · 9.8 CVE-2019-17531 >= 2.9.0, < 2.9.10.1, >= 2.7.0, < 2.8.11.5, < 2.6.7.3 2.9.10.1, 2.8.11.5, 2.6.7.3
  53. jackson-databind polymorphic typing issue
    Critical · 9.8 CVE-2019-16943 >= 2.9.0, < 2.9.10.1, >= 2.7.0, < 2.8.11.5, < 2.6.7.3 2.9.10.1, 2.8.11.5, 2.6.7.3
  54. Polymorphic Typing in FasterXML jackson-databind
    Critical · 9.8 CVE-2019-16942 >= 2.9.0, < 2.9.10.1, >= 2.7.0, < 2.8.11.5, >= 2.0.0, < 2.6.7.3 2.9.10.1, 2.8.11.5, 2.6.7.3
  55. Polymorphic Typing issue in FasterXML jackson-databind
    Critical · 9.8 CVE-2019-16335 >= 2.9.0, < 2.9.10, >= 2.7.0, < 2.8.11.5, < 2.6.7.3 2.9.10, 2.8.11.5, 2.6.7.3
  56. Polymorphic Typing issue in FasterXML jackson-databind
    Critical · 9.8 CVE-2019-14540 >= 2.9.0, < 2.9.10, >= 2.7.0, < 2.8.11.5, < 2.6.7.3 2.9.10, 2.8.11.5, 2.6.7.3
  57. Deserialization of untrusted data in FasterXML jackson-databind
    High · 7.5 CVE-2019-14439 >= 2.9.0, < 2.9.9.2, >= 2.8.0, < 2.8.11.4, >= 2.7.0, < 2.7.9.6, < 2.6.7.3 2.9.9.2, 2.8.11.4, 2.7.9.6, 2.6.7.3
  58. Deserialization of untrusted data in FasterXML jackson-databind
    Critical · 9.8 CVE-2019-14379 >= 2.9.0, < 2.9.9.2, >= 2.8.0, < 2.8.11.4, < 2.7.9.6 2.9.9.2, 2.8.11.4, 2.7.9.6
  59. Deserialization of Untrusted Data in jackson-databind
    Critical · 9.8 CVE-2018-11307 >= 2.0.0, < 2.7.9.4, >= 2.8.0, < 2.8.11.2, >= 2.9.0, < 2.9.6 2.7.9.4, 2.8.11.2, 2.9.6
  60. Information exposure in FasterXML jackson-databind
    High · 7.5 CVE-2019-12086 >= 2.9.0, < 2.9.9, >= 2.8.0, < 2.8.11.4, >= 2.7.0, < 2.7.9.6, >= 2.0.0, < 2.6.7.3 2.9.9, 2.8.11.4, 2.7.9.6, 2.6.7.3
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