CURL-CVE-2026-5773

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Source
https://curl.se/docs/CVE-2026-5773.html
Import Source
https://curl.se/docs/CURL-CVE-2026-5773.json
JSON Data
https://api.osv.dev/v1/vulns/CURL-CVE-2026-5773
Aliases
  • CVE-2026-5773
Published
2026-04-29T08:00:00Z
Modified
2026-05-19T14:06:55.512106Z
Summary
wrong reuse of SMB connection
Details

libcurl might in some circumstances reuse the wrong connection for SMB(S) transfers.

libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead.

When reusing a connection a range of criteria must be met. Due to a logical error in the code, a network transfer operation that was requested by an application could wrongfully reuse an existing SMB connection to the same server that was using a different "share" than the new subsequent transfer should.

This could in unlucky situations lead to the download of the wrong file or the upload of a file to the wrong place. When this happens, the same credentials are used and the server name is the same.

Database specific 
{
    "www": "https://curl.se/docs/CVE-2026-5773.html",
    "package": "curl",
    "URL": "https://curl.se/docs/CVE-2026-5773.json",
    "last_affected": "8.19.0",
    "severity": "Low",
    "CWE": {
        "desc": "Exposure of Data Element to Wrong Session",
        "id": "CWE-488"
    },
    "affects": "both",
    "issue": "https://hackerone.com/reports/3650689"
}
References
Credits
    • Osama Hamad - FINDER
    • Daniel Stenberg - REMEDIATION_DEVELOPER

Affected packages

Git / github.com/curl/curl.git

Affected ranges

Type
SEMVER
Events
Introduced
7.40.0
Fixed
8.20.0
Type
GIT
Repo
https://github.com/curl/curl.git
Events
Introduced
aec2e865f06669b9cb5d26cc1148d70bc418b163
Fixed
74a169575d6412dc0ff532acdf94de35a6c2a571

Affected versions

7.*
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
7.66.0
7.67.0
7.68.0
7.69.0
7.69.1
7.70.0
7.71.0
7.71.1
7.72.0
7.73.0
7.74.0
7.75.0
7.76.0
7.76.1
7.77.0
7.78.0
7.79.0
7.79.1
7.80.0
7.81.0
7.82.0
7.83.0
7.83.1
7.84.0
7.85.0
7.86.0
7.87.0
7.88.0
7.88.1
8.*
8.0.0
8.0.1
8.1.0
8.1.1
8.1.2
8.10.0
8.10.1
8.11.0
8.11.1
8.12.0
8.12.1
8.13.0
8.14.0
8.14.1
8.15.0
8.16.0
8.17.0
8.18.0
8.19.0
8.2.0
8.2.1
8.3.0
8.4.0
8.5.0
8.6.0
8.7.0
8.7.1
8.8.0
8.9.0
8.9.1
Other
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
curl-7_66_0
curl-7_67_0
curl-7_68_0
curl-7_69_0
curl-7_69_1
curl-7_70_0
curl-7_71_0
curl-7_71_1
curl-7_72_0
curl-7_73_0
curl-7_74_0
curl-7_75_0
curl-7_76_0
curl-7_76_1
curl-7_77_0
curl-7_78_0
curl-7_79_0
curl-7_79_1
curl-7_80_0
curl-7_81_0
curl-7_82_0
curl-7_83_0
curl-7_83_1
curl-7_84_0
curl-7_85_0
curl-7_86_0
curl-7_87_0
curl-7_88_0
curl-7_88_1
curl-8_0_0
curl-8_0_1
curl-8_10_0
curl-8_10_1
curl-8_11_0
curl-8_11_1
curl-8_12_0
curl-8_12_1
curl-8_13_0
curl-8_14_0
curl-8_14_1
curl-8_15_0
curl-8_16_0
curl-8_17_0
curl-8_18_0
curl-8_19_0
curl-8_1_0
curl-8_1_1
curl-8_1_2
curl-8_2_0
curl-8_2_1
curl-8_3_0
curl-8_4_0
curl-8_5_0
curl-8_6_0
curl-8_7_0
curl-8_7_1
curl-8_8_0
curl-8_9_0
curl-8_9_1
rc-8_18_0-1
rc-8_18_0-2
rc-8_18_0-3
rc-8_19_0-1
rc-8_19_0-2
rc-8_19_0-3
rc-8_20_0-1

Database specific

vanir_signatures 
[
    {
        "id": "CURL-CVE-2026-5773-ce96841d",
        "signature_version": "v1",
        "source": "https://github.com/curl/curl.git/commit/74a169575d6412dc0ff532acdf94de35a6c2a571",
        "signature_type": "Line",
        "target": {
            "file": "lib/protocol.c"
        },
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "283484103587021140185473640195385188213",
                "51413613464287816571195646581916328705",
                "50657125667698113139735675550160507197",
                "109745977035312476342802684866473502970",
                "155876444996527445678040642288005699706",
                "189120337197838981146493639364407128017",
                "110638884583177156814419953150639226214",
                "58536000395487246013630143241898699709"
            ]
        },
        "deprecated": false
    }
]
vanir_signatures_modified 
"2026-05-19T14:06:55Z"
source 
"https://curl.se/docs/CURL-CVE-2026-5773.json"