DEBIAN-CVE-2026-66032

See a problem?
Please try reporting it to the source first.
Source
https://security-tracker.debian.org/tracker/CVE-2026-66032
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-66032.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-66032
Upstream
Published
2026-07-24T17:17:35.120Z
Modified
2026-07-26T06:00:29.860941045Z
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X CVSS Calculator
Summary
[none]
Details

libssh2 through 1.11.1, fixed in commit 5e47761, contains a double-free vulnerability in the sftpopen() 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 SSHFXPOPEN with SSHFXPSTATUS containing FXOK, the response data buffer is freed, and if a subsequent sftppacketrequire() call returns a specific error such as LIBSSH2ERRORCHANNELPACKETEXCEEDED, the same pointer is freed a second time, enabling tcache dup conditions on glibc systems that allow overlapping allocations and function pointer overwrites.

References

Affected packages

Debian:11 / libssh2

Package

Name
libssh2
Purl
pkg:deb/debian/libssh2?arch=source&distro=bullseye

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.9.0-2
1.9.0-2+deb11u1
1.9.0-3
1.10.0-1
1.10.0-2
1.10.0-3
1.11.0-1
1.11.0-2
1.11.0-3
1.11.0-4
1.11.0-4.1~exp1
1.11.0-4.1
1.11.0-5
1.11.0-6
1.11.0-7
1.11.1-1
1.11.1-2
1.11.1-3
1.11.1-4

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-66032.json"

Debian:12 / libssh2

Package

Name
libssh2
Purl
pkg:deb/debian/libssh2?arch=source&distro=bookworm

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.10.0-3
1.11.0-1
1.11.0-2
1.11.0-3
1.11.0-4
1.11.0-4.1~exp1
1.11.0-4.1
1.11.0-5
1.11.0-6
1.11.0-7
1.11.1-1
1.11.1-2
1.11.1-3
1.11.1-4

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-66032.json"

Debian:13 / libssh2

Package

Name
libssh2
Purl
pkg:deb/debian/libssh2?arch=source&distro=trixie

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.11.1-1
1.11.1-1+deb13u1
1.11.1-2
1.11.1-3
1.11.1-4

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-66032.json"

Debian:14 / libssh2

Package

Name
libssh2
Purl
pkg:deb/debian/libssh2?arch=source&distro=forky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.11.1-1
1.11.1-2
1.11.1-3
1.11.1-4

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-66032.json"