CURL-CVE-2019-5482

See a problem?
Please try reporting it to the source first.
Source
https://curl.se/docs/CVE-2019-5482.html
Import Source
https://curl.se/docs/CURL-CVE-2019-5482.json
JSON Data
https://api.test.osv.dev/v1/vulns/CURL-CVE-2019-5482
Aliases
Published
2019-09-11T08:00:00Z
Modified
2026-05-18T13:46:02.561808Z
Summary
TFTP small blocksize heap buffer overflow
Details

libcurl contains a heap buffer overflow in the function (tftp_receive_packet()) that receives data from a TFTP server. It can call recvfrom() with the default size for the buffer rather than with the size that was used to allocate it. Thus, the content that might overwrite the heap memory is controlled by the server.

This flaw is only triggered if the TFTP server sends an OACK without the BLKSIZE option, when a BLKSIZE smaller than 512 bytes was requested by the TFTP client. OACK is a TFTP extension and is not used by all TFTP servers.

Users choosing a smaller block size than default should be rare as the primary use case for changing the size is to make it larger.

It is rare for users to use TFTP across the Internet. It is most commonly used within local networks. TFTP as a protocol is always inherently insecure.

This issue was introduced by the add of the TFTP BLKSIZE option handling. It was previously incompletely fixed by an almost identical issue called CVE-2019-5436.

Database specific 
{
    "last_affected": "7.65.3",
    "www": "https://curl.se/docs/CVE-2019-5482.html",
    "severity": "Medium",
    "affects": "lib",
    "issue": "https://hackerone.com/reports/684603",
    "award": {
        "amount": "250",
        "currency": "USD"
    },
    "URL": "https://curl.se/docs/CVE-2019-5482.json",
    "package": "curl",
    "CWE": {
        "desc": "Heap-based Buffer Overflow",
        "id": "CWE-122"
    }
}
References
Credits
    • Thomas Vegas - FINDER
    • Thomas Vegas - REMEDIATION_DEVELOPER

Affected packages

Git / github.com/curl/curl.git

Affected ranges

Type
SEMVER
Events
Introduced
7.19.4
Fixed
7.66.0
Type
GIT
Repo
https://github.com/curl/curl.git
Events
Introduced
0516ce7786e9500c2e447d48aa9b3f24a6ca70f9
Fixed
facb0e4662415b5f28163e853dc6742ac5fafb3d

Affected versions

7.*
7.19.4
7.19.5
7.19.6
7.19.7
7.20.0
7.20.1
7.21.0
7.21.1
7.21.2
7.21.3
7.21.4
7.21.5
7.21.6
7.21.7
7.22.0
7.23.0
7.23.1
7.24.0
7.25.0
7.26.0
7.27.0
7.28.0
7.28.1
7.29.0
7.30.0
7.31.0
7.32.0
7.33.0
7.34.0
7.35.0
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
7.64.0
7.64.1
7.65.0
7.65.1
7.65.2
7.65.3
Other
curl-7_19_4
curl-7_19_5
curl-7_19_6
curl-7_19_7
curl-7_20_0
curl-7_20_1
curl-7_21_0
curl-7_21_1
curl-7_21_2
curl-7_21_3
curl-7_21_4
curl-7_21_5
curl-7_21_6
curl-7_21_7
curl-7_22_0
curl-7_23_0
curl-7_23_1
curl-7_25_0
curl-7_26_0
curl-7_27_0
curl-7_28_0
curl-7_28_1
curl-7_29_0
curl-7_30_0
curl-7_31_0
curl-7_32_0
curl-7_33_0
curl-7_34_0
curl-7_35_0
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
curl-7_64_0
curl-7_64_1
curl-7_65_0
curl-7_65_1
curl-7_65_2
curl-7_65_3

Database specific

vanir_signatures_modified 
"2026-05-18T13:46:02Z"
source 
"https://curl.se/docs/CURL-CVE-2019-5482.json"
vanir_signatures 
[
    {
        "digest": {
            "line_hashes": [
                "26378795614508232198728425798857561476",
                "36290248131429009214612897836516156740",
                "195795806188894590575346491925218510319",
                "75130091097905654479372453573826574823",
                "51612926351918823360108022661523269401",
                "53038026563869827042776868612940455653",
                "276303289638484063040816382551882643051",
                "269768825080449628208388722441647108423",
                "113863790703894965560039882920351410290",
                "160228325956777711014816182671650096088",
                "25602577997115592850543801912675935360",
                "296897456537287635107549586264822128766",
                "91840096202607173895659644508862930595",
                "322218235016946393323333040120323880445",
                "162319686377876185121006640540801890000",
                "18741241614788194451129722701456894612",
                "311207729584293697568126388078527307720",
                "337369751088538427782254977612691571802"
            ],
            "threshold": 0.9
        },
        "target": {
            "file": "lib/tftp.c"
        },
        "id": "CURL-CVE-2019-5482-539096be",
        "deprecated": false,
        "signature_type": "Line",
        "source": "https://github.com/curl/curl.git/commit/facb0e4662415b5f28163e853dc6742ac5fafb3d",
        "signature_version": "v1"
    },
    {
        "digest": {
            "length": 1459.0,
            "function_hash": "326312936458881610076074265734184974109"
        },
        "target": {
            "file": "lib/tftp.c",
            "function": "tftp_connect"
        },
        "id": "CURL-CVE-2019-5482-bfb8c4a5",
        "deprecated": false,
        "signature_type": "Function",
        "source": "https://github.com/curl/curl.git/commit/facb0e4662415b5f28163e853dc6742ac5fafb3d",
        "signature_version": "v1"
    }
]