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01 Record

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.

HighPUBLISHEDCNA: mitre
CNA base score7.8 CVSS v3.xCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
View raw JSON

02 Description

json-c through 0.14 has an integer overflow and out-of-bounds write via a large JSON file, as demonstrated by printbuf_memappend.

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
  • Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
1.89% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 79.4% of scored records. A rank, not a probability.
NVD base score
7.8 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD analysis status
Modified. NVD last modified this record on 2026-10-14.
Red Hat severity
Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2020-05-09 00:00Z6 YR AGO
Last updated
2026-10-14 09:06Z15 DAYS AGO
Reserved
2020-05-09
Assigning CNA
mitre
Record state
PUBLISHED
Severity
High (CVSS 7.8)
CNA CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weaknesses
  • CWE-787Out-of-bounds WriteBase
  • CWE-190Integer Overflow or WraparoundBase
Data version
5.2
Document digest
27671005a88eacbefa0595f7bb98ca13b03abf5e81da1ff86ae70deab10a2a55

05 Affected products

VendorProductVersionsPlatforms
canonicalubuntu_linuxNot specified—
debiandebian_linuxNot specified—
fedoraprojectfedoraNot specified—
json-cjson-cNot specified—
redhatenterprise_linuxNot specified—
redhatrhel_eusNot specified—
siemenssinec_insNot specified—

06 References

07 Fixed in

AlmaLinux 8

  • json-c-devel
    Fixed in 0.13.1-2.el8
  • json-c-doc
    Fixed in 0.13.1-2.el8
  • libfastjson
    Fixed in 0.99.9-2.el8

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

AlmaLinux 9

  • libfastjson
    Fixed in 0.99.9-5.el9
  • libfastjson-devel
    Fixed in 0.99.9-5.el9

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Arch Linux

  • json-c
    Fixed in 0.15-1

Source: Arch Linux Security Tracker, the Arch Linux security team. Reformatted by exploit.cc.

CloudLinux 8

  • json-c-devel
    Fixed in 0.13.1-2.el8
  • json-c-doc
    Fixed in 0.13.1-2.el8
  • libfastjson
    Fixed in 0.99.9-2.el8

Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 9

  • libfastjson
    Fixed in 0.99.9-5.el9
  • libfastjson-devel
    Fixed in 0.99.9-5.el9

Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Debian 12

  • json-c
    Fixed in 0.13.1+dfsg-8
  • libfastjson
    Fixed in 1.2304.0-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

  • json-c
    Fixed in 0.13.1+dfsg-8
  • libfastjson
    Fixed in 1.2304.0-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

  • json-c
    Fixed in 0.13.1+dfsg-8
  • libfastjson
    Fixed in 1.2304.0-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 16.04 LTS

  • json-c
    Fixed in 0.11-4ubuntu2.6

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 18.04 LTS

  • json-c
    Fixed in 0.12.1-1.3ubuntu0.3

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 20.04 LTS

  • json-c
    Fixed in 0.13.1+dfsg-7ubuntu0.3

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 14.04 LTS

  • json-c
    Fixed in 0.11-3ubuntu1.2+esm3
    Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.