jackson-databind DNS SSRF via InetAddress deserialization 2.18.9, 2.21.5
CVE-2026-77310 Published on August 24, 2026
jackson-databind: Eager DNS resolution (SSRF) still present in InetAddress deserialization (Incomplete fix for CVE-2026-54514)
jackson-databind contains the general-purpose data-binding functionality and tree-model for Jackson Data Processor. Prior to versions 2.18.9, 2.21.5, 2.22.1, 3.1.5, and 3.2.1 on their respective release lines, the java.net.InetAddress branch of FromStringDeserializer.Std._deserialize() calls InetAddress.getByName() on attacker-controlled input, causing eager DNS resolution during deserialization and enabling DNS-based server-side request forgery and internal-host enumeration. This issue is fixed in versions 2.18.9, 2.21.5, 2.22.1, 3.1.5, and 3.2.1.
Vulnerability Analysis
CVE-2026-77310 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality, a small impact on integrity and availability.
Weakness Type
What is a SSRF Vulnerability?
The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. By providing URLs to unexpected hosts or ports, attackers can make it appear that the server is sending the request, possibly bypassing access controls such as firewalls that prevent the attackers from accessing the URLs directly. The server can be used as a proxy to conduct port scanning of hosts in internal networks, use other URLs such as that can access documents on the system (using file://), or use other protocols such as gopher:// or tftp://, which may provide greater control over the contents of requests.
CVE-2026-77310 has been classified to as a SSRF vulnerability or weakness.
Products Associated with CVE-2026-77310
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Affected Versions
com.fasterxml.jackson.core:jackson-databind:- Version >= 2.0.0, < 2.18.9 is affected.
- Version >= 2.19.0, < 2.21.5 is affected.
- Version >= 2.22.0, < 2.22.1 is affected.
- Version >= 3.0.0, < 3.1.5 is affected.
- Version >= 3.2.0, < 3.2.1 is affected.