HighFix available
libgit2 — security advisory
A flaw was found in libgit2 before version 0.27.3. It has been discovered that an unexpected sign extension in git_delta_apply function in delta.c file may lead to an integer overflow which in turn leads to an out of bound read, allowing to read before the base object. An attacker may use this flaw to leak memory addresses or cause a Denial of Service.
- Products
- libgit2
- Affected versions
- Not specified
- Fixed versions
- 0.27.4+dfsg.1-0.1
- CVEs
- CVE-2018-10887
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 01:28 UTC · Revision 1
Source evidence
A flaw was found in libgit2 before version 0.27.3. It has been discovered that an unexpected sign extension in git_delta_apply function in delta.c file may lead to an integer overflow which in turn leads to an out of bound read, allowing to read before the base object. An attacker may use this flaw to leak memory addresses or cause a Denial of Service.
osv:DEBIAN-CVE-2018-10887
libgit2
Fixed versions: 0.27.4+dfsg.1-0.1
libgit2
Fixed versions: 0.27.4+dfsg.1-0.1
libgit2
Fixed versions: 0.27.4+dfsg.1-0.1
Complete source record
{
"id": "11cee2fb9fff61896462875254f0f6ed156d9c12029384e0b20e8fd5630cae1b",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2018-10887",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2018-10887",
"summary": "A flaw was found in libgit2 before version 0.27.3. It has been discovered that an unexpected sign extension in git_delta_apply function in delta.c file may lead to an integer overflow which in turn leads to an out of bound read, allowing to read before the base object. An attacker may use this flaw to leak memory addresses or cause a Denial of Service.",
"evidence": "osv:DEBIAN-CVE-2018-10887",
"products": [
{
"name": {
"value": "libgit2",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.27.4+dfsg.1-0.1",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libgit2",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.27.4+dfsg.1-0.1",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libgit2",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.27.4+dfsg.1-0.1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
}
],
"severity": "high",
"structured": {
"id": "DEBIAN-CVE-2018-10887",
"aliases": [
"DEBIAN-CVE-2018-10887"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.27.4+dfsg.1-0.1"
}
]
}
],
"package": {
"name": "libgit2",
"purl": "pkg:deb/debian/libgit2?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2018-10887.json"
},
"ecosystem_specific": {
"urgency": "low"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.27.4+dfsg.1-0.1"
}
]
}
],
"package": {
"name": "libgit2",
"purl": "pkg:deb/debian/libgit2?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2018-10887.json"
},
"ecosystem_specific": {
"urgency": "low"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.27.4+dfsg.1-0.1"
}
]
}
],
"package": {
"name": "libgit2",
"purl": "pkg:deb/debian/libgit2?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2018-10887.json"
},
"ecosystem_specific": {
"urgency": "low"
}
}
],
"modified": "2026-10-23T18:04:46.497492940Z",
"provider": "osv",
"upstream": [
"CVE-2018-10887"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2018-10887"
]
},
"related_cves": [
{
"value": "CVE-2018-10887",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 423675,
"published_at": "2018-07-10T14:29:00.26+00:00"
}