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Fencer Vulns
low 2.9

CVE-2023-26819 json

cJSON 1.7.15 might allow a denial of service via a crafted JSON document such as {"a": true, "b": [ null,9999999999999999999999999999999999…

published 2025-04-19 18 mo ago modified 2026-06-17 4 mo ago also EUVD-2023-30611

cvss
2.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 14%
public exploits
0
none known

Summary

cJSON 1.7.15 might allow a denial of service via a crafted JSON document such as {"a": true, "b": [ null,9999999999999999999999999999999999999999999999912345678901234567]}.

Patch / fix

  • cjson Debian 12 1.7.15-1+deb12u3
  • cjson Debian 14, Debian 13 1.7.18-3.1

debian advisories DEBIAN-CVE-2023-26819

  • cjson Ubuntu 22.04 LTS 1.7.15-1ubuntu0.1
  • cjson Ubuntu Pro 20.04 LTS 1.7.10-1.1ubuntu0.1~esm1
  • cjson Ubuntu Pro 24.04 LTS 1.7.17-1ubuntu0.1~esm3

ubuntu advisories UBUNTU-CVE-2023-26819

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • cJSON SLE Workstation Extension 15 SP7 1.7.19-150700.3.3.1

suse advisories SUSE-SU-2025:03520-1

  • cJSON openSUSE Leap 16.0 1.7.19-160000.1.1
  • cJSON openSUSE Tumbleweed 1.7.19-1.1

opensuse advisories openSUSE-SU-2026:20340-1openSUSE-SU-2025:15583-1

  • libglvnd Azure Linux 3.0 1.7.0-3

azure linux advisories AZL-60889

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-2023-26819 updated cvss 2.9

cJSON: cJSON rejects a valid text

  • Red Hat Enterprise Linux 8 rpm-ostree, rpm-ostree-libs Red Hat Enterprise Linux 9 rpm-ostree, rpm-ostree-libs Red Hat OpenShift Container Platform 4 rpm-ostree, rpm-ostree-libs Red Hat Satellite 6 cjson
    affected: workaround, no fix available “Fix deferred”

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

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
18 mo ago

Exploit prediction

0.23% chance of exploitation in the next 30 days, higher than 14% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/boofish/json_bugs/tree/main/cjson referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 2.9 CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected products

  • cJSON Project cJSON

Classification

Weakness
  • CWE-440 Expected Behavior Violation

References

Sources

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.