CVE-2025-26466

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Source
https://cve.org/CVERecord?id=CVE-2025-26466
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-26466.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2025-26466
Downstream
Related
Published
2025-02-28T22:15:40.080Z
Modified
2026-03-17T14:34:17.842412Z
Severity
  • 5.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

A flaw was found in the OpenSSH package. For each ping packet the SSH server receives, a pong packet is allocated in a memory buffer and stored in a queue of packages. It is only freed when the server/client key exchange has finished. A malicious client may keep sending such packages, leading to an uncontrolled increase in memory consumption on the server side. Consequently, the server may become unavailable, resulting in a denial of service attack.

References

Affected packages

Git / github.com/openssh/openssh-portable

Affected ranges

Type
GIT
Repo
https://github.com/openssh/openssh-portable
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Last affected
80a2f64b8c1d27383cc83d182b73920d1e6a91f1
Introduced
0 Unknown introduced commit / All previous commits are affected
Last affected
8241b9c0529228b4b86d88b1a6076fb9f97e4a99
Introduced
0 Unknown introduced commit / All previous commits are affected
Last affected
8241b9c0529228b4b86d88b1a6076fb9f97e4a99
Introduced
0 Unknown introduced commit / All previous commits are affected
Last affected
86bdd3853f4d32c85e295e6216a2fe0953ad93f0
Introduced
0 Unknown introduced commit / All previous commits are affected
Last affected
86bdd3853f4d32c85e295e6216a2fe0953ad93f0
Introduced
0 Unknown introduced commit / All previous commits are affected
Last affected
6849957945754e6551e515f41e8cf3937cda222d
Introduced
0 Unknown introduced commit / All previous commits are affected
Last affected
6849957945754e6551e515f41e8cf3937cda222d
Introduced
0 Unknown introduced commit / All previous commits are affected
Last affected
53a80baaebda180f46e6e8571f3ff800e1f5c496
Database specific 
{
    "versions": [
        {
            "introduced": "0"
        },
        {
            "last_affected": "9.5-p1"
        },
        {
            "introduced": "0"
        },
        {
            "last_affected": "9.6-NA"
        },
        {
            "introduced": "0"
        },
        {
            "last_affected": "9.6-p1"
        },
        {
            "introduced": "0"
        },
        {
            "last_affected": "9.7-NA"
        },
        {
            "introduced": "0"
        },
        {
            "last_affected": "9.7-p1"
        },
        {
            "introduced": "0"
        },
        {
            "last_affected": "9.8-NA"
        },
        {
            "introduced": "0"
        },
        {
            "last_affected": "9.8-p1"
        },
        {
            "introduced": "0"
        },
        {
            "last_affected": "9.9-p1"
        }
    ]
}

Affected versions

Other
ABOUT_TO_ADD_INET_ATON
AFTER_FREEBSD_PAM_MERGE
AFTER_KRB5_GSSAPI_MERGE
BEFORE_FREEBSD_PAM_MERGE
BEFORE_KRB5_GSSAPI_MERGE
POST_KRB4_REMOVAL
PRE-REORDER
PRE_CYGWIN_MERGE
PRE_DAN_PATCH_MERGE
PRE_FIXPATHS_INTEGRATION
PRE_HPUX_INTEGRATION
PRE_IPV6
PRE_KRB4_REMOVAL
PRE_NEW_LOGIN_CODE
PRE_SW_KRBV
V_1_2PRE17
V_1_2_1_PRE18
V_1_2_1_PRE19
V_1_2_1_PRE20
V_1_2_1_PRE21
V_1_2_1_PRE22
V_1_2_1_PRE23
V_1_2_1_PRE24
V_1_2_1_PRE25
V_1_2_1_PRE26
V_1_2_1_PRE27
V_1_2_2
V_1_2_2_P1
V_1_2_2_PRE28
V_1_2_2_PRE29
V_1_2_3
V_1_2_3_PRE1
V_1_2_3_PRE2
V_1_2_3_PRE3
V_1_2_3_PRE4
V_1_2_3_PRE5
V_1_2_3_TEST1
V_1_2_3_TEST2
V_1_2_3_TEST3
V_1_2_PRE10
V_1_2_PRE11
V_1_2_PRE12
V_1_2_PRE13
V_1_2_PRE14
V_1_2_PRE15
V_1_2_PRE16
V_1_2_PRE4
V_1_2_PRE5
V_1_2_PRE6
V_1_2_PRE7
V_1_2_PRE8
V_1_2_PRE9
V_2_0_0_BETA1
V_2_0_0_BETA2
V_2_0_0_TEST1
V_2_1_0
V_2_1_0_P1
V_2_1_0_P2
V_2_1_0_P3
V_2_1_1_P1
V_2_1_1_P2
V_2_1_1_P3
V_2_1_1_P4
V_2_2_0_P1
V_2_3_0_P1
V_2_5_0_P1
V_2_5_1_P1
V_2_5_1_P2
V_2_5_2_P1
V_3_0_1_P1
V_3_0_P1
V_3_1_P1
V_3_2_2_P1
V_3_4_P1
V_3_6_1_P1
V_3_8_P1
V_3_9_P1
V_4_2_P1
V_5_0_P1
V_5_1_P1
V_5_2_P1
V_5_5_P1
V_5_7_P1
V_6_0_P1
V_6_1_P1
V_6_2_P1
V_6_5_P1
V_6_6_P1
V_6_8_P1
V_6_9_P1
V_7_0_P1
V_7_1_P1
V_7_2_P1
V_7_3_P1
V_7_4_P1
V_7_5_P1
V_7_6_P1
V_7_7_P1
V_7_8_P1
V_7_9_P1
V_8_0_P1
V_8_1_P1
V_8_2_P1
V_8_4_P1
V_8_5_P1
V_8_6_P1
V_8_7_P1
V_8_8_P1
V_8_9_P1
V_9_0_P1
V_9_1_P1
V_9_2_P1
V_9_3_P1
V_9_5_P1

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-26466.json"
unresolved_ranges 
[
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "9.9-NA"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "24.04"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "24.10"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "11.0"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "12.0"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "13.0"
            }
        ]
    }
]