An issue was discovered in Jansson through 2.13.1.

published 2021-04-26 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-23864

cvss: 7.5; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.7%; EPSS 1.7% chance of exploitation in 30 days, percentile 77%
public exploits: 0; none known

An issue was discovered in Jansson through 2.13.1. Due to a parsing error in json_loads, there's an out-of-bounds read-access bug. NOTE: the vendor reports that this only occurs when a programmer fails to follow the API specification

Patch / fix

distros 1

jansson CBL-Mariner 2.0 2.14-1

azure linux advisories AZL-6490

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-36325 updated 2026-11-06 cvss 7.5

jansson: out-of-bounds read in json_loads() due to a parsing error

Red Hat Enterprise Linux 7 jansson Red Hat Enterprise Linux 8 jansson Red Hat Enterprise Linux 9 jansson Red Hat JBoss Core Services jbcs-httpd24-jansson jbcs-httpd24-jansson
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.72% chance of exploitation in the next 30 days, higher than 77% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/akheron/jansson/issues/548 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness

CWE-125 Out-of-bounds Read

References

github.com /akheron/jansson/issues/548
exploit, third-party-advisory

Sources

CVE List CVE-2020-36325
NVD CVE-2020-36325

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary