High
Security advisory
In ng_pkt in transports/smart_pkt.c in libgit2 before 0.26.6 and 0.27.x before 0.27.4, a remote attacker can send a crafted smart-protocol "ng" packet that lacks a '\0' byte to trigger an out-of-bounds read that leads to DoS.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2018-15501
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 12:27 UTC · Revision 1
Source evidence
In ng_pkt in transports/smart_pkt.c in libgit2 before 0.26.6 and 0.27.x before 0.27.4, a remote attacker can send a crafted smart-protocol "ng" packet that lacks a '\0' byte to trigger an out-of-bounds read that leads to DoS.
osv:CVE-2018-15501
Complete source record
{
"id": "8b28a97aaa8d8bac27b07910aa6f7b5d939dfb385b7f674b9c9c5bbae0647492",
"url": "https://osv.dev/vulnerability/CVE-2018-15501",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2018-15501",
"summary": "In ng_pkt in transports/smart_pkt.c in libgit2 before 0.26.6 and 0.27.x before 0.27.4, a remote attacker can send a crafted smart-protocol \"ng\" packet that lacks a '\\0' byte to trigger an out-of-bounds read that leads to DoS.",
"evidence": "osv:CVE-2018-15501",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2018-15501",
"aliases": [
"CVE-2018-15501"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/libgit2/libgit2",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "e98d0a37c93574d2c6107bf7f31140b548c6a7bf"
},
{
"introduced": "6311e886d8b5377c6037cd9937ccf66a71f3361d"
},
{
"fixed": "8b89f362a34fcccdf1c6c5f3445895b71d9c6d56"
},
{
"fixed": "1f9a8510e1d2f20ed7334eeeddb92c4dd8e7c649"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:libgit2:libgit2:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "0.26.6"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:libgit2:libgit2:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0.27.0"
},
{
"fixed": "0.27.4"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "1f9a8510e1d2f20ed7334eeeddb92c4dd8e7c649"
}
],
"source": "REFERENCES_COMMIT"
},
{
"range": [
{
"fixed": "e98d0a37c93574d2c6107bf7f31140b548c6a7bf"
}
],
"source": "REFERENCES_TAG",
"original_tag": "v0.26.6"
},
{
"range": [
{
"fixed": "8b89f362a34fcccdf1c6c5f3445895b71d9c6d56"
}
],
"source": "REFERENCES_TAG",
"original_tag": "v0.27.4"
}
]
}
}
],
"versions": [
"v0.26.5",
"v0.27.3",
"v0.26.4",
"v0.27.2",
"v0.27.1",
"v0.26.3",
"v0.27.0",
"v0.26.2",
"v0.26.1",
"v0.26.0-rc2",
"v0.26.0",
"v0.26.0-rc1",
"v0.24.0",
"v0.24.0-rc1",
"v0.23.0",
"v0.23.0-rc2",
"v0.23.0-rc1",
"v0.22.0",
"v0.22.0-rc2",
"v0.22.0-rc1",
"v0.21.0",
"v0.18.0",
"v0.17.0",
"v0.16.0",
"v0.15.0",
"v0.14.0",
"v0.13.0",
"v0.12.0",
"v0.11.0",
"v0.10.0",
"v0.8.0",
"v0.3.0",
"v0.2.0",
"v0.1.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-15501.json",
"vanir_signatures": [
{
"id": "CVE-2018-15501-606741fe",
"digest": {
"length": 908,
"function_hash": "138826696511010238732541932636188295741"
},
"source": "https://github.com/libgit2/libgit2/commit/1f9a8510e1d2f20ed7334eeeddb92c4dd8e7c649",
"target": {
"file": "src/transports/smart_pkt.c",
"function": "ng_pkt"
},
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
},
{
"id": "CVE-2018-15501-cee72982",
"digest": {
"threshold": 0.9,
"line_hashes": [
"277944573312571448173291964358782886837",
"36280656565145144977492951188865350869",
"302331465101043077794962941694367824538",
"294618928152091666896038200414798230595",
"207907076655417259776009322911410236434",
"107580828438128948544648617943369281976",
"302059678418441467271694324972509664904",
"329815054368941535576649484587697607592",
"83354471640335339165381725665650886157",
"20275277051791725878689896175251433783"
]
},
"source": "https://github.com/libgit2/libgit2/commit/1f9a8510e1d2f20ed7334eeeddb92c4dd8e7c649",
"target": {
"file": "src/transports/smart_pkt.c"
},
"deprecated": false,
"signature_type": "Line",
"signature_version": "v1"
}
],
"vanir_signatures_modified": "2026-10-20T13:35:29Z"
}
}
],
"modified": "2026-10-20T13:35:29.857234910Z",
"provider": "osv",
"references": [
"https://github.com/libgit2/libgit2/releases/tag/v0.26.6",
"https://github.com/libgit2/libgit2/releases/tag/v0.27.4",
"https://lists.debian.org/debian-lts-announce/2018/08/msg00024.html",
"https://lists.debian.org/debian-lts-announce/2022/03/msg00031.html",
"https://www.pro-linux.de/sicherheit/2/44650/denial-of-service-in-libgit2.html",
"https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=9406",
"https://bugzilla.suse.com/show_bug.cgi?id=1104641",
"https://github.com/libgit2/libgit2/commit/1f9a8510e1d2f20ed7334eeeddb92c4dd8e7c649"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*",
"cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"
],
"vendor_product": "debian:debian_linux",
"extracted_events": [
{
"range": [
{
"introduced": "8.0"
},
{
"last_affected": "8.0"
},
{
"introduced": "9.0"
},
{
"last_affected": "9.0"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2018-15501",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 387848,
"published_at": "2018-08-18T02:29:01.713+00:00"
}