CVE-2026-16599

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2026-16599
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-16599.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-16599
Downstream
Published
2026-08-25T14:17:04.941Z
Modified
2026-08-27T19:34:11.167290Z
Severity
  • 5.1 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N CVSS Calculator
Summary
Denial of Service in GNU wget
Details

GNU wget is vulnerable to denial of service in its FTP OPIE/S-KEY authentication functionality. The server-supplied sequence number from the FTP challenge line is used as an iteration count for an MD5 key-derivation loop without any upper bound validation. A malicious FTP server or a network attacker positioned to intercept FTP traffic can send a crafted OPIE challenge with a sequence number near INT_MAX, causing wget to perform up to approximately 2.1 billion MD5 computations and suspend for some time. The --timeout option does not mitigate this because it applies only to network I/O, not CPU computation.

This issue was fixed in commit e9697d98e7249b0f68a6be040a4f3dcc5bc101fa

Database specific 
{
    "cna_assigner": "CERT-PL",
    "cwe_ids": [
        "CWE-606"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/16xxx/CVE-2026-16599.json"
}
References

Affected packages

Git / gitlab.com/gnuwget/wget

Affected ranges

Type
GIT
Repo
https://gitlab.com/gnuwget/wget
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
e9697d98e7249b0f68a6be040a4f3dcc5bc101fa
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "last_affected": "1.25.0"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

v1.*
v1.12
v1.13
v1.13.1
v1.13.2
v1.13.3
v1.13.4
v1.14
v1.15
v1.16
v1.16.1
v1.16.2
v1.16.3
v1.17
v1.17.1
v1.18
v1.19
v1.19.1
v1.19.2
v1.19.3
v1.19.4
v1.19.5
v1.20
v1.20.1
v1.20.2
v1.20.3
v1.21
v1.21.1
v1.21.2
v1.21.3
v1.21.4
v1.24.5
v1.25.0

Database specific

vanir_signatures_modified 
"2026-08-27T19:34:11Z"
source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-16599.json"
vanir_signatures 
[
    {
        "deprecated": false,
        "target": {
            "function": "ftp_login",
            "file": "src/ftp-basic.c"
        },
        "signature_type": "Function",
        "source": "https://gitlab.com/gnuwget/wget@e9697d98e7249b0f68a6be040a4f3dcc5bc101fa",
        "digest": {
            "length": 1392.0,
            "function_hash": "83629972154245979580097124321520827954"
        },
        "signature_version": "v1",
        "id": "CVE-2026-16599-3c99d0db"
    },
    {
        "deprecated": false,
        "target": {
            "file": "src/ftp-basic.c"
        },
        "signature_type": "Line",
        "source": "https://gitlab.com/gnuwget/wget@e9697d98e7249b0f68a6be040a4f3dcc5bc101fa",
        "digest": {
            "line_hashes": [
                "31838835215719755823778801433726113013",
                "145861084351290162579246764975654721175",
                "203516910070714193558613116798012622202",
                "61636936698075263436874688614656996076",
                "158191985247817586319588247233069805760",
                "334697050327844323255180009069964208281",
                "172228886501923724478933628700867328999",
                "243279731397249580702356342370902885608",
                "128910329323558454640215098439223119818",
                "159810301547358705014812671325287180810",
                "271053972742448853802949794134404231674",
                "241466927755026588576112322961754819515"
            ],
            "threshold": 0.9
        },
        "signature_version": "v1",
        "id": "CVE-2026-16599-d0336fb2"
    }
]