{"id":"CVE-2026-54514","aliases":["GHSA-hgj6-7826-r7m5"],"url":"https://o3.security/vulnerability/CVE-2026-54514","summary":"jackson-databind: InetSocketAddress deserialization triggers eager DNS resolution (SSRF)","details":"## Summary\n`JDKFromStringDeserializer` constructed `InetSocketAddress` with `new InetSocketAddress(host, port)`, which performs eager DNS name resolution for hostname inputs at deserialization time. An application that binds untrusted JSON into a type containing an `InetSocketAddress` field issues an attacker-chosen DNS query during `readValue`, before any application-level validation or connect logic. The fix uses `InetSocketAddress.createUnresolved(host, port)`, deferring DNS to an explicit connect.\n\n## Impact\nAn attacker controlling JSON deserialized into an `InetSocketAddress`-bearing type can force outbound DNS lookups for attacker-chosen hostnames at deserialization time (SSRF / DNS-based out-of-band interaction / internal-resolver probing), purely from binding.\n\n## Affected / Patched (verified via `git tag --contains` on `1f5a103`)\n- 2.18 line: `>= 2.18.0, < 2.18.8` -> fixed in **2.18.8**\n- 2.19-2.21 line: `>= 2.19.0, < 2.21.4` -> fixed in **2.21.4**\n- 3.x line: `>= 3.0.0, < 3.1.4` -> fixed in **3.1.4**\n\n## Severity / CWE\nMaintainer: minor. Reporter: LOW. CWE-918 (SSRF).\n\n## Upstream fix\nFasterXML/jackson-databind#5951 (\"Improve InetSocketAddress deserialization\"). Released 2026-06-04 in 2.18.8 / 2.21.4 / 3.1.4.\n\n## Credits\nOmkhar Arasaratnam (@omkhar) - finder.","published":"2026-06-23T20:51:50.612Z","modified":"2026-10-21T10:18:16.663910735Z","cvss":{"score":5.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"},"epss":{"score":0.00368,"percentile":0.3044,"asOf":"2026-09-17"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"com.fasterxml.jackson.core:jackson-databind","fixedVersion":"2.18.8"},{"ecosystem":"Maven","name":"com.fasterxml.jackson.core:jackson-databind","fixedVersion":"2.21.4"},{"ecosystem":"Maven","name":"com.fasterxml.jackson.core:jackson-databind","fixedVersion":"3.1.4"},{"ecosystem":"Maven","name":"tools.jackson.core:jackson-databind","fixedVersion":"2.21.4"},{"ecosystem":"Maven","name":"tools.jackson.core:jackson-databind","fixedVersion":"3.1.4"}],"fix":{"url":"https://github.com/FasterXML/jackson-databind/commit/1f5a1037b1e9e05920e755cb35f198bcd46667e4","label":"FasterXML/jackson-databind@1f5a103"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54514.json"},{"type":"ADVISORY","url":"https://github.com/FasterXML/jackson-databind/security/advisories/GHSA-hgj6-7826-r7m5"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-54514"},{"type":"FIX","url":"https://github.com/FasterXML/jackson-databind/commit/1f5a1037b1e9e05920e755cb35f198bcd46667e4"},{"type":"FIX","url":"https://github.com/FasterXML/jackson-databind/pull/5951"},{"type":"PACKAGE","url":"https://github.com/FasterXML/jackson-databind"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-21T10:18:16.663910735Z"}}