High
Security advisory
In libssh2 v1.9.0 and earlier versions, the SSH_MSG_DISCONNECT logic in packet.c has an integer overflow in a bounds check, enabling an attacker to specify an arbitrary (out-of-bounds) offset for a subsequent memory read. A crafted SSH server may be able to disclose sensitive information or cause a denial of service condition on the client system when a user connects to the server.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2019-17498
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 12:35 UTC · Revision 1
Source evidence
In libssh2 v1.9.0 and earlier versions, the SSH_MSG_DISCONNECT logic in packet.c has an integer overflow in a bounds check, enabling an attacker to specify an arbitrary (out-of-bounds) offset for a subsequent memory read. A crafted SSH server may be able to disclose sensitive information or cause a denial of service condition on the client system when a user connects to the server.
osv:CVE-2019-17498
Complete source record
{
"id": "d0f15d9c08c3a379a0a2ba8844b39df8b3ae55335c121ff539f7889c617e8b68",
"url": "https://osv.dev/vulnerability/CVE-2019-17498",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2019-17498",
"summary": "In libssh2 v1.9.0 and earlier versions, the SSH_MSG_DISCONNECT logic in packet.c has an integer overflow in a bounds check, enabling an attacker to specify an arbitrary (out-of-bounds) offset for a subsequent memory read. A crafted SSH server may be able to disclose sensitive information or cause a denial of service condition on the client system when a user connects to the server.",
"evidence": "osv:CVE-2019-17498",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2019-17498",
"aliases": [
"CVE-2019-17498"
],
"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": [
{
"repo": "https://github.com/libssh2/libssh2",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"last_affected": "42d37aa63129a1b2644bf6495198923534322d64"
},
{
"fixed": "dedcbd106f8e52d5586b0205bc7677e4c9868f9c"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:libssh2:libssh2:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"last_affected": "1.9.0"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "dedcbd106f8e52d5586b0205bc7677e4c9868f9c"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
"versions": [
"libssh2-1.9.0",
"libssh2-1.8.0",
"libssh2-1.7.0",
"libssh2-1.6.0",
"libssh2-1.5.0",
"libssh2-1.4.3",
"libssh2-1.4.2",
"libssh2-1.4.1",
"libssh2-1.4.0",
"libssh2-1.3.0",
"libssh2-1.2.9",
"libssh2-1.2.8",
"libssh2-1.2.7",
"libssh2-1.2.6",
"libssh2-1.2.5",
"libssh2-1.2.4",
"libssh2-1.2.3",
"libssh2-1.2.1",
"libssh2-1.2",
"RELEASE.1.1",
"RELEASE.1.0",
"RELEASE.0.18",
"RELEASE.0.17",
"RELEASE.0.16",
"RELEASE.0.15",
"beforenb2-0.14",
"beforenb-0.14",
"RELEASE.0.14",
"RELEASE.0.13",
"RELEASE.0.12",
"RELEASE.0.11",
"RELEASE.0.10",
"RELEASE.0.8",
"RELEASE.0.7",
"RELEASE.0.6",
"RELEASE.0.5",
"RELEASE.0.3",
"RELEASE.0.1"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2019-17498.json",
"vanir_signatures": [
{
"id": "CVE-2019-17498-4ecb2cf7",
"digest": {
"length": 12097,
"function_hash": "261505088534266311445285255293331755792"
},
"source": "https://github.com/libssh2/libssh2/commit/dedcbd106f8e52d5586b0205bc7677e4c9868f9c",
"target": {
"file": "src/packet.c",
"function": "_libssh2_packet_add"
},
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
},
{
"id": "CVE-2019-17498-53d4378e",
"digest": {
"threshold": 0.9,
"line_hashes": [
"134169250891193118529304932879379553847",
"205310250524678314934555577121318039325",
"153129567552562233549023166857273037888",
"178571371398251300229519893039166702638",
"72145293158586770308147922030597846856",
"26729110877010587858654623724348773108",
"49362216656574584973624410357610951344",
"321298245864012238897609765862223817780",
"35928507602771519079905685860166519231",
"154500373189842991817102946133806428940",
"165260082386745301364993297193505505821",
"224084172619535272672790341246973090398",
"5356660278860416646992393454495665580",
"215185288519949424268549841841085459888",
"41027521565758756400721139453438296743",
"261770080105454089080864056643957326646",
"112577356930656868917282695859156546607",
"266091588552765774451985637383685229894",
"161769171353065646776261864065306578590",
"106289505878685820278644300603721530175",
"239192671667185276821494449931361882054",
"119841806266198942322557246315210598842",
"185703913995006478349460337437414305001",
"162441443838476641014842705979708130684",
"183245701107550523990847736687199011265",
"50426275079859766355449435496213490799",
"324037346491845418402829931648401701867",
"179688840526055267239603553007128508269",
"264669166455797101183041518857048771469",
"44646834277421589325966971756374060949",
"82508341436968592692150147669647547214",
"79003347772182151645683941089650774376",
"249863810074470457690593679896838544992",
"253210672333095990954285753391413575534",
"336128189688039022752011594700859913608",
"153291091772006957249977471727743164452",
"23965398749853137458110744797193196914",
"269605763674799612557017037989398087974",
"29582490785044912089364730362447932295",
"258315015777790198444196601037297632797",
"152978136810771868822522218180542514737",
"57312958982436694499078779749389722939",
"57734602486406847187201186044700211719",
"51438989373981932051151411266176576083",
"61635492046474294702511841284264092832",
"219459798151302566118951099564811896122",
"141584221698062118268403157313352537570",
"303446371127046191600335366631671521471",
"114603074537250694026974277582493472820"
]
},
"source": "https://github.com/libssh2/libssh2/commit/dedcbd106f8e52d5586b0205bc7677e4c9868f9c",
"target": {
"file": "src/packet.c"
},
"deprecated": false,
"signature_type": "Line",
"signature_version": "v1"
}
],
"vanir_signatures_modified": "2026-10-20T13:55:33Z"
}
}
],
"modified": "2026-10-20T13:55:33.227927354Z",
"provider": "osv",
"references": [
"https://cert-portal.siemens.com/productcert/html/ssa-398330.html",
"https://lists.debian.org/debian-lts-announce/2023/09/msg00006.html",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/22H4Q5XMGS3QNSA7OCL3U7UQZ4NXMR5O/",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TY7EEE34RFKCTXTMBQQWWSLXZWSCXNDB/",
"https://lists.debian.org/debian-lts-announce/2019/11/msg00010.html",
"https://lists.debian.org/debian-lts-announce/2021/12/msg00013.html",
"https://security.netapp.com/advisory/ntap-20220909-0004/",
"https://github.com/libssh2/libssh2/commit/dedcbd106f8e52d5586b0205bc7677e4c9868f9c",
"https://blog.semmle.com/libssh2-integer-overflow-CVE-2019-17498/",
"https://github.com/kevinbackhouse/SecurityExploits/tree/8cbdbbe6363510f7d9ceec685373da12e6fc752d/libssh2/out_of_bounds_read_disconnect_CVE-2019-17498",
"https://github.com/libssh2/libssh2/blob/42d37aa63129a1b2644bf6495198923534322d64/src/packet.c#L480"
],
"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"
}
]
},
{
"cpes": [
"cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*",
"cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*"
],
"vendor_product": "fedoraproject:fedora",
"extracted_events": [
{
"range": [
{
"introduced": "30"
},
{
"last_affected": "30"
},
{
"introduced": "31"
},
{
"last_affected": "31"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*"
],
"vendor_product": "opensuse:leap",
"extracted_events": [
{
"range": [
{
"introduced": "15.1"
},
{
"last_affected": "15.1"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2019-17498",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 388385,
"published_at": "2019-10-21T22:15:10.523+00:00"
}