High
Security advisory
blosc2.c in Blosc C-Blosc2 through 2.0.0.beta.5 has a heap-based buffer overflow when there is a lack of space to write compressed data.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2020-29367
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 12:36 UTC · Revision 1
Source evidence
blosc2.c in Blosc C-Blosc2 through 2.0.0.beta.5 has a heap-based buffer overflow when there is a lack of space to write compressed data.
osv:CVE-2020-29367
Complete source record
{
"id": "4e6129d1b1d6bdbdc142ebfdcd04cb420460f9234842528279d91daefdfda6f1",
"url": "https://osv.dev/vulnerability/CVE-2020-29367",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2020-29367",
"summary": "blosc2.c in Blosc C-Blosc2 through 2.0.0.beta.5 has a heap-based buffer overflow when there is a lack of space to write compressed data.",
"evidence": "osv:CVE-2020-29367",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2020-29367",
"aliases": [
"CVE-2020-29367",
"GHSA-8c7c-2c8j-3xfp"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
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"repo": "https://github.com/blosc/c-blosc2",
"type": "GIT",
"events": [
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{
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{
"fixed": "c4c6470e88210afc95262c8b9fcc27e30ca043ee"
}
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{
"last_affected": "2.0.0.beta.5"
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"source": "DESCRIPTION"
},
{
"range": [
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"fixed": "c4c6470e88210afc95262c8b9fcc27e30ca043ee"
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"source": "REFERENCES_COMMIT"
}
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}
}
],
"versions": [
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"v2.0.0-beta.4",
"v2.0.0-beta.3",
"v2.0.0-beta.1",
"v2.0.0a5",
"v2.0.0a4",
"v2.0.0a3",
"v2.0.0a2"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-29367.json",
"vanir_signatures": [
{
"id": "CVE-2020-29367-1f559629",
"digest": {
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"function_hash": "326153899096615029256325386252686542973"
},
"source": "https://github.com/blosc/c-blosc2/commit/c4c6470e88210afc95262c8b9fcc27e30ca043ee",
"target": {
"file": "blosc/blosc2.c",
"function": "blosc_c"
},
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
},
{
"id": "CVE-2020-29367-523d5c56",
"digest": {
"threshold": 0.9,
"line_hashes": [
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"source": "https://github.com/blosc/c-blosc2/commit/c4c6470e88210afc95262c8b9fcc27e30ca043ee",
"target": {
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"signature_type": "Line",
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"vanir_signatures_modified": "2026-10-20T13:59:36Z"
}
}
],
"modified": "2026-10-20T13:59:36.943310418Z",
"provider": "osv",
"references": [
"https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=26442",
"https://github.com/Blosc/c-blosc2/commit/c4c6470e88210afc95262c8b9fcc27e30ca043ee"
],
"provider_metadata": {
"unresolved_ranges": [
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"cpes": [
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"cpe:2.3:a:blosc:c-blosc2:2.0.0:alpha3:*:*:*:*:*:*",
"cpe:2.3:a:blosc:c-blosc2:2.0.0:alpha4:*:*:*:*:*:*",
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"cpe:2.3:a:blosc:c-blosc2:2.0.0:beta1:*:*:*:*:*:*",
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],
"vendor_product": "blosc:c-blosc2",
"extracted_events": [
{
"range": [
{
"introduced": "2.0.0-alpha2"
},
{
"last_affected": "2.0.0-alpha2"
},
{
"introduced": "2.0.0-alpha3"
},
{
"last_affected": "2.0.0-alpha3"
},
{
"introduced": "2.0.0-alpha4"
},
{
"last_affected": "2.0.0-alpha4"
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{
"introduced": "2.0.0-alpha5"
},
{
"last_affected": "2.0.0-alpha5"
},
{
"introduced": "2.0.0-beta1"
},
{
"last_affected": "2.0.0-beta1"
},
{
"introduced": "2.0.0-beta2"
},
{
"last_affected": "2.0.0-beta2"
},
{
"introduced": "2.0.0-beta3"
},
{
"last_affected": "2.0.0-beta3"
},
{
"introduced": "2.0.0-beta4"
},
{
"last_affected": "2.0.0-beta4"
},
{
"introduced": "2.0.0-beta5"
},
{
"last_affected": "2.0.0-beta5"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2020-29367",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 388487,
"published_at": "2020-11-27T20:15:11.09+00:00"
}