CVE-2026-86321 java-json-tools jackson-coreutils URL Validation JsonLoader.java JsonLoader.fromURL server-side request forgery
Attackers can exploit server-side request forgery in jackson-coreutils to access internal resources or bypass security controls.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-86321?
CVE-2026-86321 is a medium-severity server-side request forgery vulnerability in java-json-tools jackson-coreutils, published on 7 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability was found in java-json-tools jackson-coreutils 2.0. Affected by this issue is the function JsonLoader.fromURL of the file src/main/java/com/github/fge/jackson/JsonLoader.java of the component URL Validation. The manipulation results in server-side request forgery. It is possible to launch the attack remotely. The exploit has been made public and could be used. The project was informed of the problem early through an issue report but has not responded yet.
Weakness: CWE-918
Which versions are affected by CVE-2026-86321?
How do I fix CVE-2026-86321?
No fix has been published for CVE-2026-86321 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-86321 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-86321 exists.
Sources
Also known as GHSA-rrq3-h776-pmxg.