DNS-based SSRF via eager InetAddress resolution
Published Aug 24, 2026 · Updated Aug 24, 2026
SSRF in FasterXML jackson-databind before 2.18.9, 2.21.5, 2.22.1, 3.1.5, and 3.2.1 allows remote attackers to trigger DNS lookups. The InetAddress branch of FromStringDeserializer.Std._deserialize() passes attacker-controlled strings to InetAddress.getByName(), causing eager forward resolution. Exploitation requires an application to deserialize controlled data into an InetAddress target and yields DNS callbacks or internal-host enumeration, not arbitrary HTTP requests or code execution.
Summary
What happened
SSRF in FasterXML jackson-databind before 2.18.9, 2.21.5, 2.22.1, 3.1.5, and 3.2.1 allows remote attackers to trigger DNS lookups. The InetAddress branch of FromStringDeserializer.Std._deserialize() passes attacker-controlled strings to InetAddress.getByName(), causing eager forward resolution. Exploitation requires an application to deserialize controlled data into an InetAddress target and yields DNS callbacks or internal-host enumeration, not arbitrary HTTP requests or code execution.
The record
- CVE
- CVE-2026-77310
- Published
- Aug 24, 2026
- Updated
- Aug 24, 2026
- Vendor
- FasterXML
- Product
- jackson-databind
- Classifications
- CWE-918
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 24, 2026CVE publishedPublication date reported by the CVE source.
- Aug 24, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=>= 2.0.0, < 2.18.9
- Affected versionversion=>= 2.19.0, < 2.21.5
- Affected versionversion=>= 2.22.0, < 2.22.1
- Affected versionversion=>= 3.0.0, < 3.1.5
- Affected versionversion=>= 3.2.0, < 3.2.1
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- InetAddress resolver-count proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
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