High
rsync < 3.5.0 TLS Certificate Validation Bypass via SSL/OpenSSL Mode
Type: advisorySources: OSV
rsync 3.2.0 through 3.2.3 (openssl mode) and rsync-ssl through 3.4.4 (stunnel mode) contain a TLS certificate validation vulnerability that allows on-path attackers to intercept encrypted sessions by presenting self-signed or otherwise invalid certificates. Attackers can exploit the failure to validate server TLS certificates against a trusted CA or verify certificate hostname matching to decrypt or tamper with rsync session content without detection by the client.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-70454
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 7 Nov 2026, 06:52 UTC · Revision 1
Source evidence
rsync < 3.5.0 TLS Certificate Validation Bypass via SSL/OpenSSL Mode
core-osv · Original sourcePublished 13 Aug 2026, 14:45 UTC
rsync 3.2.0 through 3.2.3 (openssl mode) and rsync-ssl through 3.4.4 (stunnel mode) contain a TLS certificate validation vulnerability that allows on-path attackers to intercept encrypted sessions by presenting self-signed or otherwise invalid certificates. Attackers can exploit the failure to validate server TLS certificates against a trusted CA or verify certificate hostname matching to decrypt or tamper with rsync session content without detection by the client.
osv:CVE-2026-70454
Complete source record
{
"id": "46d9f997eafe5318330bf5eb7328b7e2c5619fe7cc8fca0a3965683d26d5ffba",
"url": "https://osv.dev/vulnerability/CVE-2026-70454",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "rsync < 3.5.0 TLS Certificate Validation Bypass via SSL/OpenSSL Mode",
"summary": "rsync 3.2.0 through 3.2.3 (openssl mode) and rsync-ssl through 3.4.4 (stunnel mode) contain a TLS certificate validation vulnerability that allows on-path attackers to intercept encrypted sessions by presenting self-signed or otherwise invalid certificates. Attackers can exploit the failure to validate server TLS certificates against a trusted CA or verify certificate hostname matching to decrypt or tamper with rsync session content without detection by the client.",
"evidence": "osv:CVE-2026-70454",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-70454",
"aliases": [
"CVE-2026-70454",
"GHSA-3c3x-ww2w-5r5p"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/rsyncproject/rsync",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "471e17dc0d68233db84db11be82c9f62f4661214"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"last_affected": "3.4.4"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
},
{
"range": [
{
"fixed": "471e17dc0d68233db84db11be82c9f62f4661214"
}
],
"source": "REFERENCES_TAG",
"original_tag": "v3.5.0"
}
]
}
}
],
"versions": [
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-70454.json"
}
}
],
"modified": "2026-10-28T02:30:49.986567790Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/70xxx/CVE-2026-70454.json",
"https://github.com/RsyncProject/rsync/releases/tag/v3.5.0",
"https://github.com/RsyncProject/rsync/security/advisories/GHSA-3c3x-ww2w-5r5p",
"https://nvd.nist.gov/vuln/detail/CVE-2026-70454",
"https://www.vulncheck.com/advisories/rsync-tls-certificate-validation-bypass-via-ssl-openssl-mode",
"https://github.com/RsyncProject/rsync"
],
"provider_metadata": {
"cwe_ids": [
"CWE-295"
],
"cna_assigner": "VulnCheck",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/70xxx/CVE-2026-70454.json"
}
},
"related_cves": [
{
"value": "CVE-2026-70454",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 518552,
"published_at": "2026-08-13T14:45:39.599+00:00"
}