Vulnerability-Lookup

OESA-2023-1186 (CVE-2020-12762)

Vulnerability from osv_openeuler – Published: 2023-03-31 11:05 – Updated: 2026-08-06 11:05 – Source website

Summary

libfastjson security update

Details

libfastjson is a fork from json-c, and is currently under development. The aim of this is not to provide a slightly modified clone of json-c. It's aim is to provide: a small library with essential json handling functions, sufficiently good json support (not 100% standards compliant), be very fast in processing.

Security Fix(es):

json-c through 0.14 has an integer overflow and out-of-bounds write via a large JSON file, as demonstrated by printbuf_memappend.(CVE-2020-12762)

Severity

7.8 (High)


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

References

URL

Type

	https://www.openeuler.org/en/security/safety-bull…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2020-12762	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "libfastjson-0.99.9-3.oe1.aarch64.rpm",
          "libfastjson-devel-0.99.9-3.oe1.aarch64.rpm",
          "libfastjson-debugsource-0.99.9-3.oe1.aarch64.rpm",
          "libfastjson-debuginfo-0.99.9-3.oe1.aarch64.rpm"
        ],
        "src": [
          "libfastjson-0.99.9-3.oe1.src.rpm"
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        "x86_64": [
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          "libfastjson-debugsource-0.99.9-3.oe1.x86_64.rpm",
          "libfastjson-devel-0.99.9-3.oe1.x86_64.rpm",
          "libfastjson-0.99.9-3.oe1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP1",
        "name": "libfastjson",
        "purl": "pkg:rpm/openEuler/libfastjson\u0026distro=openEuler-20.03-LTS-SP1"
      },
      "ranges": [
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            {
              "introduced": "0"
            },
            {
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      ]
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  ],
  "database_specific": {
    "severity": "High"
  },
  "details": "libfastjson is a fork from json-c, and is currently under development. The aim of this is not to provide a slightly modified clone of json-c. It\u0026apos;s aim is to provide: a small library with essential json handling functions, sufficiently good json support (not 100% standards compliant), be very fast in processing.\r\n\r\nSecurity Fix(es):\r\n\r\njson-c through 0.14 has an integer overflow and out-of-bounds write via a large JSON file, as demonstrated by printbuf_memappend.(CVE-2020-12762)",
  "id": "OESA-2023-1186",
  "modified": "2026-08-06T11:05:39Z",
  "published": "2023-03-31T11:05:39Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2023-1186"
    },
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      "type": "ADVISORY",
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    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "libfastjson security update",
  "upstream": [
    "CVE-2020-12762"
  ]
}

CVE-2020-12762 (GCVE-0-2020-12762)

Vulnerability from cvelistv5 – Published: 2020-05-09 00:00 – Updated: 2025-11-03 19:25

Summary

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

Severity

7.8 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-05-30 19:18 UTC

CWE

n/a
CWE-787 - Out-of-bounds Write

Assigner

mitre mitre root

References

16 references

URL	Tags
https://github.com/json-c/json-c/pull/592
https://github.com/rsyslog/libfastjson/issues/161
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://usn.ubuntu.com/4360-1/	vendor-advisory
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://lists.debian.org/debian-lts-announce/2020…	mailing-list
https://lists.debian.org/debian-lts-announce/2020…	mailing-list
https://usn.ubuntu.com/4360-4/	vendor-advisory
https://security.gentoo.org/glsa/202006-13	vendor-advisory
https://lists.debian.org/debian-lts-announce/2020…	mailing-list
https://www.debian.org/security/2020/dsa-4741	vendor-advisory
https://security.netapp.com/advisory/ntap-2021052…
https://cert-portal.siemens.com/productcert/pdf/s…
https://lists.debian.org/debian-lts-announce/2023…	mailing-list
https://lists.debian.org/debian-lts-announce/2025…

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.