CVE-2026-54514: FasterXML jackson-databind SSRF via eager DNS resolution in InetSocketAddress

CVE-2026-54514 · Severity: medium · CVSS 5.3 · Published 2026-06-23

FasterXML jackson-databind is a widely used Java library for converting data between JSON and Java objects. A vulnerability in how it handles network address data allows an attacker to force the application to perform unauthorized DNS lookups. This could be used by an attacker to map internal network infrastructure or facilitate data exfiltration through DNS-based side channels.

Technologies: FasterXML Jackson Databind, com.fasterxml.jackson.core:jackson-databind (Maven), tools.jackson.core:jackson-databind (Maven). Vendors: FasterXML, Maven.

Quick answers

Is CVE-2026-54514 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-54514 being exploited in the wild.
How severe is CVE-2026-54514?
Medium severity, with a CVSS score of 5.3, published 23 June 2026.
Which products and versions are affected?
FasterXML Jackson Databind >= 2.0.0, < 2.18.8; >= 2.19.0, < 2.21.4; >= 3.0.0, < 3.1.4; com.fasterxml.jackson.core:jackson-databind (Maven) ECOSYSTEM:introduced=2.0.0,fixed=2.18.8; tools.jackson.core:jackson-databind (Maven) ECOSYSTEM:introduced=2.19.0,fixed=2.21.4.
Is there a fix for CVE-2026-54514?
Yes. com.fasterxml.jackson.core:jackson-databind (Maven): upgrade to 2.18.8 or later; tools.jackson.core:jackson-databind (Maven): upgrade to 2.21.4 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-54514 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2026-54514?
Check whether you run FasterXML Jackson Databind, com.fasterxml.jackson.core:jackson-databind (Maven) or tools.jackson.core:jackson-databind (Maven) 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.

How to fix

  • com.fasterxml.jackson.core:jackson-databind (Maven): upgrade to 2.18.8 or later
    # set com.fasterxml.jackson.core:jackson-databind to 2.18.8 in your pom.xml or build.gradle
  • tools.jackson.core:jackson-databind (Maven): upgrade to 2.21.4 or later
    # set tools.jackson.core:jackson-databind to 2.21.4 in your pom.xml or build.gradle

Technical details

A Server-Side Request Forgery (SSRF) vulnerability exists in jackson-databind's JDKFromStringDeserializer. When deserializing JSON data into a type containing an InetSocketAddress field, the library uses a constructor that triggers an immediate DNS lookup for the provided hostname. This occurs during the readValue process before any application-level validation can take place. An unauthenticated remote attacker can exploit this by submitting crafted JSON to trigger DNS queries to arbitrary hostnames, which can be used for internal network probing or out-of-band data exfiltration. The issue is resolved by using InetSocketAddress.createUnresolved() to defer resolution until an explicit connection is made. Fixes are available in versions 2.18.8, 2.21.4, and 3.1.4.

Affected products

  • FasterXML jackson-databind >= 2.0.0, < 2.18.8; >= 2.19.0, < 2.21.4; >= 3.0.0, < 3.1.4

Identifiers

  • CVE-2026-54514
  • GHSA-hgj6-7826-r7m5

Timeline

  • 2026-05-06: patched: Fix merged into 2.18 branch
  • 2026-06-04: other: Release of fixed versions 2.18.8, 2.21.4, and 3.1.4
  • 2026-06-16: advisory: GitHub Security Advisory published
  • 2026-06-23: disclosed: CVE published to NVD

References

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