GHSA-vvgp-rfg2-7rr6: com.fasterxml.jackson.core:jackson-databind (CVE-2026-77310)

Package	Ecosystem	Affected	Fixed in
com.fasterxml.jackson.core:jackson-databind	Maven	>=2.0.0, <2.18.9 \|\| >=2.19.0, <2.21.5 \|\| >=2.22.0, <2.22.1	2.18.9, 2.21.5, 2.22.1
tools.jackson.core:jackson-databind	Maven	>=3.0.0, <3.1.5 \|\| >=3.2.0, <3.2.1	3.1.5, 3.2.1

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Jackson-databind versions 2.0.0 up to 2.18.9, 2.19.0 up to 2.21.5, and 2.22.0 up to 2.22.1, plus tools.jackson.core:jackson-databind 3.0.0 up to 3.1.5 and 3.2.0 up to 3.2.1, are affected. When deserializing into an InetAddress, the library performs a forward DNS lookup on attacker-supplied input, which lets an attacker who can influence the JSON trigger out-of-band DNS requests and probe whether internal hostnames resolve. Upgrade to 2.18.9, 2.21.5, 2.22.1, 3.1.5, or 3.2.1 as applicable; the source does not describe a workaround.

Written 2 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
5.3	Medium	3.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0031, the 24th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 14:16 UTC First seen by agentprime
31 Oct 2026, 14:16 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.