Low
wrong reuse of SMB connection
Type: advisorySources: OSV
libcurl might in some circumstances reuse the wrong connection for SMB(S) transfers. libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead. When reusing a connection a range of criteria must be met. Due to a logical error in the code, a network transfer operation that was requested by an application could wrongfully reuse an existing SMB connection to the same server that was using a different "share" than the new subsequent transfer should. This could in unlucky situations lead to the download of the wrong file or the upload of a file to the wrong place. When this happens, the same credentials are used and the server name is the same.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-5773
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 09:39 UTC · Revision 1
Source evidence
libcurl might in some circumstances reuse the wrong connection for SMB(S) transfers. libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead. When reusing a connection a range of criteria must be met. Due to a logical error in the code, a network transfer operation that was requested by an application could wrongfully reuse an existing SMB connection to the same server that was using a different "share" than the new subsequent transfer should. This could in unlucky situations lead to the download of the wrong file or the upload of a file to the wrong place. When this happens, the same credentials are used and the server name is the same.
osv:CURL-CVE-2026-5773
Complete source record
{
"id": "366e205f35f18c4e96c3b3c2a788746f1ec1b3035fbae867c7f4b7a8ae181416",
"url": "https://osv.dev/vulnerability/CURL-CVE-2026-5773",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "wrong reuse of SMB connection",
"summary": "libcurl might in some circumstances reuse the wrong connection for SMB(S) transfers. libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead. When reusing a connection a range of criteria must be met. Due to a logical error in the code, a network transfer operation that was requested by an application could wrongfully reuse an existing SMB connection to the same server that was using a different \"share\" than the new subsequent transfer should. This could in unlucky situations lead to the download of the wrong file or the upload of a file to the wrong place. When this happens, the same credentials are used and the server name is the same.",
"evidence": "osv:CURL-CVE-2026-5773",
"products": [],
"severity": "low",
"structured": {
"id": "CURL-CVE-2026-5773",
"aliases": [
"CURL-CVE-2026-5773",
"CVE-2026-5773"
],
"affected": [
{
"ranges": [
{
"type": "SEMVER",
"events": [
{
"introduced": "7.40.0"
},
{
"fixed": "8.14.2"
},
{
"introduced": "8.15.0"
},
{
"fixed": "8.16.1"
},
{
"introduced": "8.17.0"
},
{
"fixed": "8.20.0"
}
]
},
{
"repo": "https://github.com/curl/curl.git",
"type": "GIT",
"events": [
{
"introduced": "aec2e865f06669b9cb5d26cc1148d70bc418b163"
},
{
"fixed": "74a169575d6412dc0ff532acdf94de35a6c2a571"
}
]
}
],
"versions": [
"8.19.0",
"8.18.0",
"8.17.0",
"8.16.0",
"8.15.0",
"8.14.1",
"8.14.0",
"8.13.0",
"8.12.1",
"8.12.0",
"8.11.1",
"8.11.0",
"8.10.1",
"8.10.0",
"8.9.1",
"8.9.0",
"8.8.0",
"8.7.1",
"8.7.0",
"8.6.0",
"8.5.0",
"8.4.0",
"8.3.0",
"8.2.1",
"8.2.0",
"8.1.2",
"8.1.1",
"8.1.0",
"8.0.1",
"8.0.0",
"7.88.1",
"7.88.0",
"7.87.0",
"7.86.0",
"7.85.0",
"7.84.0",
"7.83.1",
"7.83.0",
"7.82.0",
"7.81.0",
"7.80.0",
"7.79.1",
"7.79.0",
"7.78.0",
"7.77.0",
"7.76.1",
"7.76.0",
"7.75.0",
"7.74.0",
"7.73.0",
"7.72.0",
"7.71.1",
"7.71.0",
"7.70.0",
"7.69.1",
"7.69.0",
"7.68.0",
"7.67.0",
"7.66.0",
"7.65.3",
"7.65.2",
"7.65.1",
"7.65.0",
"7.64.1",
"7.64.0",
"7.63.0",
"7.62.0",
"7.61.1",
"7.61.0",
"7.60.0",
"7.59.0",
"7.58.0",
"7.57.0",
"7.56.1",
"7.56.0",
"7.55.1",
"7.55.0",
"7.54.1",
"7.54.0",
"7.53.1",
"7.53.0",
"7.52.1",
"7.52.0",
"7.51.0",
"7.50.3",
"7.50.2",
"7.50.1",
"7.50.0",
"7.49.1",
"7.49.0",
"7.48.0",
"7.47.1",
"7.47.0",
"7.46.0",
"7.45.0",
"7.44.0",
"7.43.0",
"7.42.1",
"7.42.0",
"7.41.0",
"7.40.0",
"rc-8_20_0-1",
"curl-8_19_0",
"rc-8_19_0-3",
"rc-8_19_0-2",
"rc-8_19_0-1",
"curl-8_18_0",
"rc-8_18_0-3",
"rc-8_18_0-2",
"rc-8_18_0-1",
"curl-8_17_0",
"curl-8_16_0",
"curl-8_15_0",
"curl-8_14_1",
"curl-8_14_0",
"curl-8_13_0",
"curl-8_12_1",
"curl-8_12_0",
"curl-8_11_1",
"curl-8_11_0",
"curl-8_10_1",
"curl-8_10_0",
"curl-8_9_1",
"curl-8_9_0",
"curl-8_8_0",
"curl-8_7_1",
"curl-8_7_0",
"curl-8_6_0",
"curl-8_5_0",
"tiny-curl-8_4_0",
"curl-8_4_0",
"curl-8_3_0",
"curl-8_2_1",
"curl-8_2_0",
"curl-8_1_2",
"curl-8_1_1",
"curl-8_1_0",
"curl-8_0_1",
"curl-8_0_0",
"curl-7_88_1",
"curl-7_88_0",
"curl-7_87_0",
"curl-7_86_0",
"curl-7_85_0",
"curl-7_84_0",
"curl-7_83_1",
"curl-7_83_0",
"curl-7_82_0",
"curl-7_81_0",
"curl-7_80_0",
"curl-7_79_1",
"curl-7_79_0",
"curl-7_78_0",
"curl-7_77_0",
"curl-7_76_1",
"curl-7_76_0",
"curl-7_75_0",
"curl-7_74_0",
"curl-7_73_0",
"tiny-curl-7_72_0",
"curl-7_72_0",
"curl-7_71_1",
"curl-7_71_0",
"curl-7_70_0",
"curl-7_69_1",
"curl-7_69_0",
"curl-7_68_0",
"curl-7_67_0",
"curl-7_66_0",
"curl-7_65_3",
"curl-7_65_2",
"curl-7_65_1",
"curl-7_65_0",
"curl-7_64_1",
"curl-7_64_0",
"curl-7_63_0",
"curl-7_62_0",
"curl-7_61_1",
"curl-7_61_0",
"curl-7_60_0",
"curl-7_59_0",
"curl-7_58_0",
"curl-7_57_0",
"curl-7_56_1",
"curl-7_56_0",
"curl-7_55_1",
"curl-7_55_0",
"curl-7_54_1",
"curl-7_54_0",
"curl-7_53_1",
"curl-7_53_0",
"curl-7_52_1",
"curl-7_52_0",
"curl-7_51_0",
"curl-7_50_3",
"curl-7_50_2",
"curl-7_50_1",
"curl-7_50_0",
"curl-7_49_1",
"curl-7_49_0",
"curl-7_48_0",
"curl-7_47_1",
"curl-7_47_0",
"curl-7_46_0",
"curl-7_45_0",
"curl-7_44_0",
"curl-7_43_0",
"curl-7_42_1",
"curl-7_42_0",
"curl-7_41_0",
"curl-7_40_0"
],
"database_specific": {
"source": "https://curl.se/docs/CURL-CVE-2026-5773.json",
"vanir_signatures": [
{
"id": "CURL-CVE-2026-5773-ce96841d",
"digest": {
"threshold": 0.9,
"line_hashes": [
"283484103587021140185473640195385188213",
"51413613464287816571195646581916328705",
"50657125667698113139735675550160507197",
"109745977035312476342802684866473502970",
"155876444996527445678040642288005699706",
"189120337197838981146493639364407128017",
"110638884583177156814419953150639226214",
"58536000395487246013630143241898699709"
]
},
"source": "https://github.com/curl/curl.git/commit/74a169575d6412dc0ff532acdf94de35a6c2a571",
"target": {
"file": "lib/protocol.c"
},
"deprecated": false,
"signature_type": "Line",
"signature_version": "v1"
}
],
"vanir_signatures_modified": "2026-10-25T01:05:22Z"
}
}
],
"modified": "2026-10-25T01:05:22.922347197Z",
"provider": "osv",
"references": [],
"provider_metadata": {
"CWE": {
"id": "CWE-488",
"desc": "Exposure of Data Element to Wrong Session"
},
"URL": "https://curl.se/docs/CVE-2026-5773.json",
"www": "https://curl.se/docs/CVE-2026-5773.html",
"issue": "https://hackerone.com/reports/3650689",
"affects": "both",
"package": "curl",
"severity": "Low",
"last_affected": "8.19.0"
}
},
"related_cves": [
{
"value": "CVE-2026-5773",
"evidence": "/aliases"
}
],
"security_relevant": true,
"severity_evidence": "/database_specific/severity"
},
"source_id": "core-osv",
"document_id": 444379,
"published_at": "2026-04-29T08:00:00+00:00"
}