Most severe vulnerabilities for "libssh2 libssh2" 1.11.1

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libssh2 libssh2libssh2 - Out-of-Bounds Write via Unchecked packet_length in transport.c

Risk 85

Severity

9.2

AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Last updated 30 June 2026

1 / 3

Source: Ubuntu

First published (updated )

CVE-2026-55200

libssh2 libssh2libssh2 Double-Free Heap Corruption via sftp_open()

Risk 77

Severity

8.7

Double Free

AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Last updated 23 September 2026

1 / 3

Source: Ubuntu

First published (updated )

CVE-2026-66032

libssh2 libssh2libssh2 Integer Underflow DoS via AES-GCM Cipher Negotiation

Risk 47

Severity

8.7

Integer Underflow

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Last updated 4 September 2026

1 / 3

Source: Ubuntu

First published (updated )

CVE-2026-66033

libssh2 libssh2libssh2 - Heap Buffer Over-read via sftp_symlink() in sftp.c

Risk 55

Severity

8.3

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/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

Last updated 30 June 2026

1 / 3

Source: Ubuntu

First published (updated )

CVE-2025-15661

libssh2 libssh2libssh2 - Integer Overflow in publickey Subsystem Attribute Allocation

Risk 60

Severity

8.3

Integer Overflow, Buffer Overflow

AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H

Last updated 23 September 2026

1 / 3

Source: Ubuntu

First published (updated )

CVE-2026-58050

libssh2 libssh2libssh2 - Free of Uninitialized Pointer in publickey List Cleanup

Risk 52

Severity

8.3

AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H

Last updated 23 September 2026

1 / 3

Source: Ubuntu

First published (updated )

CVE-2026-58051

libssh2 libssh2libssh2 - Pre-Authentication DoS via SSH_MSG_EXT_INFO Handler

Risk 46

Severity

8.2

AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Last updated 30 June 2026

1 / 3

Source: Ubuntu

First published (updated )

CVE-2026-55199

libssh2 libssh2libssh2 Heap Buffer Overflow via ETM Cipher Negotiation

Risk 71

Severity

7.7

Buffer Overflow

AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Last updated 4 September 2026

1 / 3

Source: Ubuntu

First published (updated )

CVE-2026-66035

libssh2 libssh2libssh2 Heap Out-of-Bounds Read via publickey subsystem

Risk 71

Severity

7.7

AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Last updated 23 September 2026

1 / 3

Source: Ubuntu

First published (updated )

CVE-2026-66034

libssh2 libssh2libssh2 userauth.c userauth_password integer overflow

Risk 47

Severity

6.9

EPSS

0.07%

Integer Overflow

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:X/RL:O/RC:C

A security vulnerability has been detected in libssh2 up to 1.11.1. The impacted element is the function userauthpassword of the file src/userauth.c. Such manipulation of the argument usernamelen/passwordlen leads to integer overflow. The attack may be launched remotely. The name of the patch is 256d04b60d80bf1190e96b0ad1e91b2174d744b1. A patch should be applied to remediate this issue.

1 / 3

Source: MITRE

First published (updated )

CVE-2026-7598

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