CVE-2026-66032

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Source
https://cve.org/CVERecord?id=CVE-2026-66032
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-66032.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-66032
Downstream
AZL (1)
BELL (1)
CGA (6)
DEBIAN (1)
ECHO (1)
JLSEC (1)
MGASA (1)
OESA (5)
openSUSE (2)
RHSA (2)
ROOT (5)
SUSE (9)
UBUNTU (1)
Related
openSUSE (2)
SUSE (9)
Published
2026-07-24T16:32:39Z
Modified
2026-09-14T18:26:51Z
Severity
  • 8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CVSS Calculator
Summary
libssh2 Double-Free Heap Corruption via sftp_open()
Details

libssh2 through 1.11.1, fixed in commit 5e47761, contains a double-free vulnerability in the sftp_open() function in src/sftp.c that allows a malicious SSH server to corrupt the heap of any authenticated client opening an SFTP session. When a server responds to SSH_FXP_OPEN with SSH_FXP_STATUS containing FX_OK, the response data buffer is freed, and if a subsequent sftp_packet_require() call returns a specific error such as LIBSSH2_ERROR_CHANNEL_PACKET_EXCEEDED, the same pointer is freed a second time, enabling tcache dup conditions on glibc systems that allow overlapping allocations and function pointer overwrites.

Database specific 
{
    "cna_assigner":  "VulnCheck",
    "cwe_ids":  [
        "CWE-415"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/66xxx/CVE-2026-66032.json"
}
References

Affected packages

Git / github.com/libssh2/libssh2

Affected ranges

Type
GIT
Repo
https://github.com/libssh2/libssh2
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
5e4776146552d898b9c0e1b313cd093fa8dc92d0
Database specific
Show details 
{
    "cpe":  "cpe:2.3:a:libssh2:libssh2:*:*:*:*:*:*:*:*",
    "extracted_events":  [
        {
            "introduced":  "0"
        },
        {
            "last_affected":  "1.11.1"
        }
    ],
    "source":  [
        "CPE_RANGE",
        "REFERENCES"
    ]
}

Affected versions

RELEASE.*
RELEASE.0.1
RELEASE.0.10
RELEASE.0.11
RELEASE.0.12
RELEASE.0.13
RELEASE.0.14
RELEASE.0.15
RELEASE.0.16
RELEASE.0.17
RELEASE.0.18
RELEASE.0.3
RELEASE.0.5
RELEASE.0.6
RELEASE.0.7
RELEASE.0.8
RELEASE.1.0
RELEASE.1.1
beforenb-0.*
beforenb-0.14
beforenb2-0.*
beforenb2-0.14
libssh2-1.*
libssh2-1.10.0
libssh2-1.11.0
libssh2-1.11.1
libssh2-1.2
libssh2-1.2.1
libssh2-1.2.3
libssh2-1.2.4
libssh2-1.2.5
libssh2-1.2.6
libssh2-1.2.7
libssh2-1.2.8
libssh2-1.2.9
libssh2-1.3.0
libssh2-1.4.0
libssh2-1.4.1
libssh2-1.4.2
libssh2-1.4.3
libssh2-1.5.0
libssh2-1.6.0
libssh2-1.7.0
libssh2-1.8.0
libssh2-1.9.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-66032.json"
vanir_signatures 
[
    {
        "deprecated":  false,
        "digest":  {
            "function_hash":  "33264403999217637035238251445367858212",
            "length":  5058
        },
        "id":  "CVE-2026-66032-83cc2e9f",
        "signature_type":  "Function",
        "signature_version":  "v1",
        "source":  "https://github.com/libssh2/libssh2/commit/5e4776146552d898b9c0e1b313cd093fa8dc92d0",
        "target":  {
            "file":  "src/sftp.c",
            "function":  "sftp_open"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "line_hashes":  [
                "324192115594221831694647950376857451632",
                "336061196034926044958593142467814960912",
                "41304970594478553678543807861292796172",
                "332648750590961424773944216179931312826"
            ],
            "threshold":  0.9
        },
        "id":  "CVE-2026-66032-a50a072b",
        "signature_type":  "Line",
        "signature_version":  "v1",
        "source":  "https://github.com/libssh2/libssh2/commit/5e4776146552d898b9c0e1b313cd093fa8dc92d0",
        "target":  {
            "file":  "src/sftp.c"
        }
    }
]
vanir_signatures_modified 
"2026-08-12T16:09:59Z"