CURL-CVE-2019-3822

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Source
https://curl.se/docs/CVE-2019-3822.html
Import Source
https://curl.se/docs/CURL-CVE-2019-3822.json
JSON Data
https://api.test.osv.dev/v1/vulns/CURL-CVE-2019-3822
Aliases
Published
2019-02-06T08:00:00Z
Modified
2026-05-18T13:46:06.173106Z
Summary
NTLMv2 type-3 header stack buffer overflow
Details

libcurl contains a stack based buffer overflow vulnerability.

The function creating an outgoing NTLM type-3 header (lib/vauth/ntlm.c:Curl_auth_create_ntlm_type3_message()), generates the request HTTP header contents based on previously received data. The check that exists to prevent the local buffer from getting overflowed is implemented wrongly (using unsigned math) and as such it does not prevent the overflow from happening.

This output data can grow larger than the local buffer if large response data is extracted from a previous NTLMv2 header provided by the malicious or broken HTTP server.

Such large response data needs to be around 1000 bytes or more. The actual payload data copied to the target buffer comes from the NTLMv2 type-2 response header.

Database specific 
{
    "affects": "both",
    "last_affected": "7.63.0",
    "package": "curl",
    "www": "https://curl.se/docs/CVE-2019-3822.html",
    "severity": "High",
    "CWE": {
        "desc": "Stack-based Buffer Overflow",
        "id": "CWE-121"
    },
    "URL": "https://curl.se/docs/CVE-2019-3822.json"
}
References
Credits
    • Wenxiang Qian of Tencent Blade Team - FINDER
    • Daniel Stenberg - REMEDIATION_DEVELOPER
    • Huzaifa Sidhpurwala - OTHER

Affected packages

Git / github.com/curl/curl.git

Affected ranges

Type
SEMVER
Events
Introduced
7.36.0
Fixed
7.64.0
Type
GIT
Repo
https://github.com/curl/curl.git
Events
Introduced
86724581b6c02d160b52f817550cfdfc9c93af62
Fixed
50c9484278c63b958655a717844f0721263939cc

Affected versions

7.*
7.36.0
7.37.0
7.37.1
7.38.0
7.39.0
7.40.0
7.41.0
7.42.0
7.42.1
7.43.0
7.44.0
7.45.0
7.46.0
7.47.0
7.47.1
7.48.0
7.49.0
7.49.1
7.50.0
7.50.1
7.50.2
7.50.3
7.51.0
7.52.0
7.52.1
7.53.0
7.53.1
7.54.0
7.54.1
7.55.0
7.55.1
7.56.0
7.56.1
7.57.0
7.58.0
7.59.0
7.60.0
7.61.0
7.61.1
7.62.0
7.63.0
Other
curl-7_36_0
curl-7_37_0
curl-7_37_1
curl-7_38_0
curl-7_39_0
curl-7_40_0
curl-7_41_0
curl-7_42_0
curl-7_43_0
curl-7_44_0
curl-7_45_0
curl-7_46_0
curl-7_47_0
curl-7_47_1
curl-7_48_0
curl-7_49_0
curl-7_49_1
curl-7_50_0
curl-7_50_1
curl-7_50_2
curl-7_50_3
curl-7_51_0
curl-7_52_0
curl-7_52_1
curl-7_53_0
curl-7_53_1
curl-7_54_0
curl-7_54_1
curl-7_55_0
curl-7_55_1
curl-7_56_0
curl-7_56_1
curl-7_57_0
curl-7_58_0
curl-7_59_0
curl-7_60_0
curl-7_61_0
curl-7_61_1
curl-7_62_0
curl-7_63_0

Database specific

vanir_signatures 
[
    {
        "source": "https://github.com/curl/curl.git/commit/50c9484278c63b958655a717844f0721263939cc",
        "signature_version": "v1",
        "target": {
            "file": "lib/vauth/ntlm.c"
        },
        "signature_type": "Line",
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "46522549148290454789925570788080158728",
                "49236166746968004033894625933615643172",
                "293989637352139989590772450278867974609",
                "337876479484979625219132730045572941827",
                "28263089313798147067029949814912665161",
                "73333534050834162111357397437957432721",
                "272835995896107667374360360978373141065",
                "172736422550849646938343555519740730524"
            ],
            "threshold": 0.9
        },
        "id": "CURL-CVE-2019-3822-0fb0f4e0"
    },
    {
        "source": "https://github.com/curl/curl.git/commit/50c9484278c63b958655a717844f0721263939cc",
        "signature_version": "v1",
        "target": {
            "function": "Curl_auth_create_ntlm_type3_message",
            "file": "lib/vauth/ntlm.c"
        },
        "signature_type": "Function",
        "deprecated": false,
        "digest": {
            "length": 5186.0,
            "function_hash": "281456879565379301859239210676266882046"
        },
        "id": "CURL-CVE-2019-3822-4f5c57d6"
    }
]
vanir_signatures_modified 
"2026-05-18T13:46:06Z"
source 
"https://curl.se/docs/CURL-CVE-2019-3822.json"