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.

CVSS 3.1

7.8CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS

1.9% chance of exploitation in the next 30 days; higher than 79% of CVEs (scores of 2026-10-25)

CWEs

CWE-190, CWE-787

Published

2020-05-09

Modified

2026-10-14

Record from

the NVD, synced 2026-10-19

Affected

• canonical:ubuntu_linux
• debian:debian_linux
• fedoraproject:fedora
• json-c:json-c
• siemens:sinec_ins

References

• https://cert-portal.siemens.com/productcert/pdf/ssa-637483.pdf
• https://github.com/json-c/json-c/pull/592
• https://github.com/rsyslog/libfastjson/issues/161
• https://lists.debian.org/debian-lts-announce/2020/05/msg00032.html
• https://lists.debian.org/debian-lts-announce/2020/05/msg00034.html

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