HighFix available
json-c, libfastjson — security advisory
json-c through 0.14 has an integer overflow and out-of-bounds write via a large JSON file, as demonstrated by printbuf_memappend.
- Products
- json-c, libfastjson
- Affected versions
- Not specified
- Fixed versions
- 0.13.1-r1, 0.14-r1, 1.2304.0-r0
- CVEs
- CVE-2020-12762
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 12:01 UTC · Revision 1
Source evidence
json-c through 0.14 has an integer overflow and out-of-bounds write via a large JSON file, as demonstrated by printbuf_memappend.
osv:ALPINE-CVE-2020-12762
json-c
Fixed versions: 0.13.1-r1
json-c
Fixed versions: 0.13.1-r1
json-c
Fixed versions: 0.14-r1
json-c
Fixed versions: 0.14-r1
json-c
Fixed versions: 0.14-r1
json-c
Fixed versions: 0.14-r1
json-c
Fixed versions: 0.14-r1
json-c
Fixed versions: 0.14-r1
json-c
Fixed versions: 0.14-r1
json-c
Fixed versions: 0.14-r1
json-c
Fixed versions: 0.14-r1
json-c
Fixed versions: 0.14-r1
json-c
Fixed versions: 0.14-r1
json-c
Fixed versions: 0.14-r1
json-c
Fixed versions: 0.14-r1
json-c
Fixed versions: 0.13.1-r1
libfastjson
Fixed versions: 1.2304.0-r0
libfastjson
Fixed versions: 1.2304.0-r0
libfastjson
Fixed versions: 1.2304.0-r0
libfastjson
Fixed versions: 1.2304.0-r0
libfastjson
Fixed versions: 1.2304.0-r0
libfastjson
Fixed versions: 1.2304.0-r0
libfastjson
Fixed versions: 1.2304.0-r0
libfastjson
Fixed versions: 1.2304.0-r0
libfastjson
Fixed versions: 1.2304.0-r0
libfastjson
Fixed versions: 1.2304.0-r0
Complete source record
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-12762.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
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"type": "ECOSYSTEM",
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},
{
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],
"package": {
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"purl": "pkg:apk/alpine/libfastjson?arch=source",
"ecosystem": "Alpine:v3.23"
},
"database_specific": {
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},
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},
{
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"package": {
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"ecosystem": "Alpine:v3.24"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-12762.json"
},
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}
],
"modified": "2026-10-26T11:17:55.110784019Z",
"provider": "osv",
"upstream": [
"CVE-2020-12762"
],
"references": [
"https://security.alpinelinux.org/vuln/CVE-2020-12762"
]
},
"related_cves": [
{
"value": "CVE-2020-12762",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 450375,
"published_at": "2020-05-09T18:15:11.283+00:00"
}