Vulnerability · CVE-2020-12762
json-c through 0.14 has an integer overflow and out-of-bounds write via a large JSON file, as demonstrated by printbuf_memappend.
Published May 9, 2020 · catalog updated Oct 14, 2026 · json-c through 0.14 has
Check if you run it
No confirmed exploitation is on record for CVE-2020-12762. EPSS is 1.90%. Act only if a listed version of json-c through 0.14 has is installed.
Gaps on this record
- The stored product name is a package slug. The name on this page is taken from the title (json-c through 0.14 has).
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
- Severity
- High7.8
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 1.90%
- Remediation
- Advisory link
- Affected products
- cpe canonical/ubuntu linux · cpe debian/debian linux · cpe fedoraproject/fedora · cpe json-c/json-c · cpe siemens/sinec ins
json-c through 0.14 has an integer overflow and out-of-bounds write via a large JSON file, as demonstrated by printbuf_memappend.
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- cpe canonical/ubuntu linux12.04
- cpe debian/debian linux10.0
- cpe debian/debian linux8.0
- cpe debian/debian linux9.0
- cpe fedoraproject/fedora30
- cpe fedoraproject/fedora31
- cpe fedoraproject/fedora32
- cpe json-c/json-cversion unspecified
- cpe siemens/sinec insversion unspecified
How to fix CVE-2020-12762
Recommended remediation
A patch or advisory reference is linked. Open the original publisher for availability by product version.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2020-12762. EPSS is 1.90%. Act only if a listed version of json-c through 0.14 has is installed.
Which versions are affected?
Compare what you have installed with canonical/ubuntu linux 12.04; debian/debian linux 10.0; debian/debian linux 8.0; debian/debian linux 9.0. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-190: Integer Overflow; CWE-787: Out-of-bounds Write. EPSS 1.90%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
May 9, 2020 · NIST NVD
Detected
json-c through 0.14 has an integer overflow and out-of-bounds write via a large JSON file, as demonstrated by printbuf_memappend.
Oct 14, 2026 · NIST NVD
Updated
json-c through 0.14 has an integer overflow and out-of-bounds write via a large JSON file, as demonstrated by printbuf_memappend.
Sources
- CVE.orgVulnerability recordCVE-2020-12762
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2020-12762
30-day exploitation probability 1.9%
first.org - NIST NVDVulnerability recordCVE-2020-12762
json-c through 0.14 has an integer overflow and out-of-bounds write via a large JSON file, as demonstrated by printbuf_memappend.
nvd.nist.gov
References
Freshness
Last verified in this catalog Oct 16, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.