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    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 2, 2020
    Last Modified:Nov 3, 2025
    EPS:May 9, 2020
    EPSS Score:0.0028
    CVSS Score:7.8

    Affected Products

    Vendor
    Canonical
    Product
    Ubuntu Linux
    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    Json-c
    Product
    Json-c
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Rhel Eus
    Vendor
    Siemens
    Product
    Sinec Ins

    Exploits

    https://github.com/json-c/json-c/pull/592https://github.com/rsyslog/libfastjson/issues/161https://github.com/json-c/json-c/pull/592https://github.com/rsyslog/libfastjson/issues/161

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-92 Forced Integer Overflow

    Related CVEs

    CVE-2026-13476 (CVSS 7.3) — IBM Informix Dynamic Server 14.10, 15.0, and 12.10 could allow an unauthenticated user to execute arbitrary co…
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    CVE-2026-47337 (CVSS 3.3) — Ubuntu Linux 6.8, 6.17 and 7.0 contain SAUCE patches with a possible NULL pointer dereference in the handling …
    CVE-2026-47336 (CVSS 3.3) — Ubuntu Linux 6.8 contains SAUCE patches with a possible use of an uninitialized variable in AppArmor AF_INET/A…
    CVE-2026-47335 (CVSS 5.5) — Ubuntu Linux 6.8 contains SAUCE patches with a possible NULL pointer dereference in the handling of AppArmor n…
    CVE-2026-47334 (CVSS 5.5) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly sleep while holding a spinlock…
    CVE-2026-47333 (CVSS 7.8) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which can potentially incorrectly compute the si…
    CVE-2026-47332 (CVSS 5.5) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly validate the size of an intern…
    CVE-2026-47331 (CVSS 7.8) — Ubuntu Linux 6.8 contains AppArmor SAUCE patches which fail to acquire a lock when modifying a linked list. An…
    CVE-2026-47330 (CVSS 3.3) — Ubuntu Linux 6.8, 7.17 and 7.0 contain AppArmor SAUCE patches which can, under certain circumstances, use an u…

    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
    https://lists.debian.org/debian-lts-announce/2020/07/msg00031.html
    https://lists.debian.org/debian-lts-announce/2023/06/msg00023.html
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CBR36IXYBHITAZFB5PFBJTED22WO5ONB/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CQQRRGBQCAWNCCJ2HN3W5SSCZ4QGMXQI/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/W226TSCJBEOXDUFVKNWNH7ETG7AR6MCS/
    https://security.gentoo.org/glsa/202006-13
    https://security.netapp.com/advisory/ntap-20210521-0001/
    https://usn.ubuntu.com/4360-1/
    https://usn.ubuntu.com/4360-4/
    https://www.debian.org/security/2020/dsa-4741
    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
    https://lists.debian.org/debian-lts-announce/2020/07/msg00031.html
    https://lists.debian.org/debian-lts-announce/2023/06/msg00023.html
    https://lists.debian.org/debian-lts-announce/2025/07/msg00021.html
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CBR36IXYBHITAZFB5PFBJTED22WO5ONB/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CQQRRGBQCAWNCCJ2HN3W5SSCZ4QGMXQI/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/W226TSCJBEOXDUFVKNWNH7ETG7AR6MCS/
    https://security.gentoo.org/glsa/202006-13
    https://security.netapp.com/advisory/ntap-20210521-0001/
    https://usn.ubuntu.com/4360-1/
    https://usn.ubuntu.com/4360-4/
    https://www.debian.org/security/2020/dsa-4741

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High