CURL-CVE-2026-11856

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Source
https://curl.se/docs/CVE-2026-11856.html
Import Source
https://curl.se/docs/CURL-CVE-2026-11856.json
JSON Data
https://api.osv.dev/v1/vulns/CURL-CVE-2026-11856
Aliases
  • CVE-2026-11856
Published
2026-06-24T08:00:00Z
Modified
2026-06-24T08:07:07.389634Z
Summary
cross-origin Digest auth state leak
Details

Successfully using libcurl to do a transfer to a specific HTTP origin (hostA) with Digest authentication and then changing the origin to a different one (hostB) for a second transfer, reusing the same handle, makes libcurl wrongly pass on the Authorization: header field meant for hostA, to hostB.

Database specific 
{
    "package": "curl",
    "URL": "https://curl.se/docs/CVE-2026-11856.json",
    "last_affected": "8.20.0",
    "issue": "https://hackerone.com/reports/3793260",
    "affects": "lib",
    "severity": "Medium",
    "www": "https://curl.se/docs/CVE-2026-11856.html",
    "CWE": {
        "desc": "Authentication Bypass by Capture-replay",
        "id": "CWE-294"
    }
}
References
Credits
    • jjchuck on hackerone - FINDER
    • Daniel Stenberg - REMEDIATION_DEVELOPER

Affected packages

Git / github.com/curl/curl.git

Affected ranges

Type
SEMVER
Events
Introduced
7.10.6
Fixed
8.21.0
Type
GIT
Repo
https://github.com/curl/curl.git
Events
Introduced
334d78cd18a7310144383929bdcef34ffbf6159b
Fixed
5c6b4880357ab3e72967c1c45cae0f96ffabc535

Affected versions

7.*
7.10.6
7.10.7
7.10.8
7.11.0
7.11.1
7.11.2
7.12.0
7.12.1
7.12.2
7.12.3
7.13.0
7.13.1
7.13.2
7.14.0
7.14.1
7.15.0
7.15.1
7.15.2
7.15.3
7.15.4
7.15.5
7.16.0
7.16.1
7.16.2
7.16.3
7.16.4
7.17.0
7.17.1
7.18.0
7.18.1
7.18.2
7.19.0
7.19.1
7.19.2
7.19.3
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
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
8.20.0
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
before_ftp_statemachine
curl-7_10_6
curl-7_10_7
curl-7_10_8
curl-7_11_0
curl-7_11_1
curl-7_11_2
curl-7_12_0
curl-7_12_1
curl-7_12_2
curl-7_12_3
curl-7_13_0
curl-7_13_1
curl-7_13_2
curl-7_14_0
curl-7_14_1
curl-7_15_0
curl-7_15_1
curl-7_15_2
curl-7_15_3
curl-7_15_4
curl-7_15_5
curl-7_15_6-prepipeline
curl-7_16_0
curl-7_16_1
curl-7_16_2
curl-7_16_3
curl-7_16_4
curl-7_17_0
curl-7_17_0-preldapfix
curl-7_17_1
curl-7_18_0
curl-7_18_1
curl-7_18_2
curl-7_19_0
curl-7_19_1
curl-7_19_2
curl-7_19_3
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_24_0
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_42_1
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_20_0
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
rc-8_20_0-2
rc-8_20_0-3
rc-8_21_0-1
rc-8_21_0-2
tiny-curl-7_72_0
tiny-curl-8_4_0

Database specific

source 
"https://curl.se/docs/CURL-CVE-2026-11856.json"
vanir_signatures_modified 
"2026-06-24T08:07:07Z"
vanir_signatures 
[
    {
        "target": {
            "file": "lib/vauth/digest.c"
        },
        "id": "CURL-CVE-2026-11856-03c6adfc",
        "source": "https://github.com/curl/curl.git/commit/5c6b4880357ab3e72967c1c45cae0f96ffabc535",
        "signature_type": "Line",
        "deprecated": false,
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "72468393350518143134204758224881668841",
                "60073479596154811849922764497733642287",
                "256147216265901341340017032923259907120",
                "119614045470514872127058270568012208473"
            ]
        },
        "signature_version": "v1"
    },
    {
        "target": {
            "file": "lib/http_digest.c"
        },
        "id": "CURL-CVE-2026-11856-3e2a1e34",
        "source": "https://github.com/curl/curl.git/commit/5c6b4880357ab3e72967c1c45cae0f96ffabc535",
        "signature_type": "Line",
        "deprecated": false,
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "164204164563672603101704047603045445358",
                "315365079544018725974853273504753167301",
                "73108907385898325704232685031305948653",
                "32084135395173408664347464202584010472"
            ]
        },
        "signature_version": "v1"
    },
    {
        "target": {
            "file": "lib/http_digest.c",
            "function": "Curl_output_digest"
        },
        "id": "CURL-CVE-2026-11856-56545289",
        "source": "https://github.com/curl/curl.git/commit/5c6b4880357ab3e72967c1c45cae0f96ffabc535",
        "signature_type": "Function",
        "deprecated": false,
        "digest": {
            "length": 1066.0,
            "function_hash": "118656286641636339575039176885280000777"
        },
        "signature_version": "v1"
    },
    {
        "target": {
            "file": "lib/urldata.h"
        },
        "id": "CURL-CVE-2026-11856-598c47cd",
        "source": "https://github.com/curl/curl.git/commit/5c6b4880357ab3e72967c1c45cae0f96ffabc535",
        "signature_type": "Line",
        "deprecated": false,
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "63917068056463326315122996636294873575",
                "276170765844152756272618069305043058488",
                "169424575069735909212067418632017288504",
                "243874813925842655498566283328592077957",
                "141623004244702485986868354992268940282",
                "263980355106232861814426512928627163418",
                "224487920238237756663718970455433201536",
                "62983878650870836478269198489397934062",
                "31199387498090313881099271973340596047"
            ]
        },
        "signature_version": "v1"
    },
    {
        "target": {
            "file": "lib/vauth/digest_sspi.c"
        },
        "id": "CURL-CVE-2026-11856-6ac23657",
        "source": "https://github.com/curl/curl.git/commit/5c6b4880357ab3e72967c1c45cae0f96ffabc535",
        "signature_type": "Line",
        "deprecated": false,
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "179089377150793739573173530912117096637",
                "209054385039078862952672936161830123808",
                "183211453477588361730059064127128129848"
            ]
        },
        "signature_version": "v1"
    },
    {
        "target": {
            "file": "lib/vauth/digest.c",
            "function": "Curl_auth_digest_cleanup"
        },
        "id": "CURL-CVE-2026-11856-c95f0fc7",
        "source": "https://github.com/curl/curl.git/commit/5c6b4880357ab3e72967c1c45cae0f96ffabc535",
        "signature_type": "Function",
        "deprecated": false,
        "digest": {
            "length": 318.0,
            "function_hash": "73972979594284121042835701929183217406"
        },
        "signature_version": "v1"
    },
    {
        "target": {
            "file": "lib/vauth/digest_sspi.c",
            "function": "Curl_auth_digest_cleanup"
        },
        "id": "CURL-CVE-2026-11856-dffad452",
        "source": "https://github.com/curl/curl.git/commit/5c6b4880357ab3e72967c1c45cae0f96ffabc535",
        "signature_type": "Function",
        "deprecated": false,
        "digest": {
            "length": 270.0,
            "function_hash": "94729404215738391218808497679631866932"
        },
        "signature_version": "v1"
    }
]