CVE-2026-7168 (GCVE-0-2026-7168)
Vulnerability from cvelistv5 – Published: 2026-05-13 08:29 – Updated: 2026-09-15 06:03
VLAI
EPSS
VEX
Title
cross-proxy Digest auth state leak
Summary
Successfully using libcurl to do a transfer over a specific HTTP proxy
(`proxyA`) with **Digest** authentication and then changing the proxy host to
a second one (`proxyB`) for a second transfer, reusing the same handle, makes
libcurl wrongly pass on the `Proxy-Authorization:` header field meant for
`proxyA`, to `proxyB`.
Severity
5.3 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-13 14:18 UTC
CWE
- CWE-294 - Authentication Bypass by Capture-replay
Assigner
References
Impacted products
3 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| curl | curl |
Affected:
7.12.0 , < 8.14.2
(semver)
Affected: 8.15.0 , < 8.16.1 (semver) Affected: 8.17.0 , < 8.20.0 (semver) |
guessed | |
| curl | curl |
Affected:
fc6eff13b5414caf6edf22d73a3239e074a04216 , < c1cfdf59acbaf9504c4578d4cf56cdd7c8594507
(git)
|
guessed | |
| curl | curl |
Affected:
8.19.0
Affected: 8.18.0 Affected: 8.17.0 Affected: 8.16.0 Affected: 8.15.0 Affected: 8.14.1 Affected: 8.14.0 Affected: 8.13.0 Affected: 8.12.1 Affected: 8.12.0 Affected: 8.11.1 Affected: 8.11.0 Affected: 8.10.1 Affected: 8.10.0 Affected: 8.9.1 Affected: 8.9.0 Affected: 8.8.0 Affected: 8.7.1 Affected: 8.7.0 Affected: 8.6.0 Affected: 8.5.0 Affected: 8.4.0 Affected: 8.3.0 Affected: 8.2.1 Affected: 8.2.0 Affected: 8.1.2 Affected: 8.1.1 Affected: 8.1.0 Affected: 8.0.1 Affected: 8.0.0 Affected: 7.88.1 Affected: 7.88.0 Affected: 7.87.0 Affected: 7.86.0 Affected: 7.85.0 Affected: 7.84.0 Affected: 7.83.1 Affected: 7.83.0 Affected: 7.82.0 Affected: 7.81.0 Affected: 7.80.0 Affected: 7.79.1 Affected: 7.79.0 Affected: 7.78.0 Affected: 7.77.0 Affected: 7.76.1 Affected: 7.76.0 Affected: 7.75.0 Affected: 7.74.0 Affected: 7.73.0 Affected: 7.72.0 Affected: 7.71.1 Affected: 7.71.0 Affected: 7.70.0 Affected: 7.69.1 Affected: 7.69.0 Affected: 7.68.0 Affected: 7.67.0 Affected: 7.66.0 Affected: 7.65.3 Affected: 7.65.2 Affected: 7.65.1 Affected: 7.65.0 Affected: 7.64.1 Affected: 7.64.0 Affected: 7.63.0 Affected: 7.62.0 Affected: 7.61.1 Affected: 7.61.0 Affected: 7.60.0 Affected: 7.59.0 Affected: 7.58.0 Affected: 7.57.0 Affected: 7.56.1 Affected: 7.56.0 Affected: 7.55.1 Affected: 7.55.0 Affected: 7.54.1 Affected: 7.54.0 Affected: 7.53.1 Affected: 7.53.0 Affected: 7.52.1 Affected: 7.52.0 Affected: 7.51.0 Affected: 7.50.3 Affected: 7.50.2 Affected: 7.50.1 Affected: 7.50.0 Affected: 7.49.1 Affected: 7.49.0 Affected: 7.48.0 Affected: 7.47.1 Affected: 7.47.0 Affected: 7.46.0 Affected: 7.45.0 Affected: 7.44.0 Affected: 7.43.0 Affected: 7.42.1 Affected: 7.42.0 Affected: 7.41.0 Affected: 7.40.0 Affected: 7.39.0 Affected: 7.38.0 Affected: 7.37.1 Affected: 7.37.0 Affected: 7.36.0 Affected: 7.35.0 Affected: 7.34.0 Affected: 7.33.0 Affected: 7.32.0 Affected: 7.31.0 Affected: 7.30.0 Affected: 7.29.0 Affected: 7.28.1 Affected: 7.28.0 Affected: 7.27.0 Affected: 7.26.0 Affected: 7.25.0 Affected: 7.24.0 Affected: 7.23.1 Affected: 7.23.0 Affected: 7.22.0 Affected: 7.21.7 Affected: 7.21.6 Affected: 7.21.5 Affected: 7.21.4 Affected: 7.21.3 Affected: 7.21.2 Affected: 7.21.1 Affected: 7.21.0 Affected: 7.20.1 Affected: 7.20.0 Affected: 7.19.7 Affected: 7.19.6 Affected: 7.19.5 Affected: 7.19.4 Affected: 7.19.3 Affected: 7.19.2 Affected: 7.19.1 Affected: 7.19.0 Affected: 7.18.2 Affected: 7.18.1 Affected: 7.18.0 Affected: 7.17.1 Affected: 7.17.0 Affected: 7.16.4 Affected: 7.16.3 Affected: 7.16.2 Affected: 7.16.1 Affected: 7.16.0 Affected: 7.15.5 Affected: 7.15.4 Affected: 7.15.3 Affected: 7.15.2 Affected: 7.15.1 Affected: 7.15.0 Affected: 7.14.1 Affected: 7.14.0 Affected: 7.13.2 Affected: 7.13.1 Affected: 7.13.0 Affected: 7.12.3 Affected: 7.12.2 Affected: 7.12.1 Affected: 7.12.0 |
guessed |
{
"containers": {
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"baseScore": 5.3,
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{
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{
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{
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"version": "7.32.0"
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{
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{
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"version": "7.30.0"
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{
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{
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"version": "7.23.0"
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{
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"version": "7.21.7"
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{
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{
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},
{
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},
{
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},
{
"status": "affected",
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},
{
"status": "affected",
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},
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},
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},
{
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},
{
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"version": "7.18.0"
},
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},
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"version": "7.17.0"
},
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},
{
"status": "affected",
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},
{
"status": "affected",
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},
{
"status": "affected",
"version": "7.16.1"
},
{
"status": "affected",
"version": "7.16.0"
},
{
"status": "affected",
"version": "7.15.5"
},
{
"status": "affected",
"version": "7.15.4"
},
{
"status": "affected",
"version": "7.15.3"
},
{
"status": "affected",
"version": "7.15.2"
},
{
"status": "affected",
"version": "7.15.1"
},
{
"status": "affected",
"version": "7.15.0"
},
{
"status": "affected",
"version": "7.14.1"
},
{
"status": "affected",
"version": "7.14.0"
},
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"status": "affected",
"version": "7.13.2"
},
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"status": "affected",
"version": "7.13.1"
},
{
"status": "affected",
"version": "7.13.0"
},
{
"status": "affected",
"version": "7.12.3"
},
{
"status": "affected",
"version": "7.12.2"
},
{
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"version": "7.12.1"
},
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"version": "7.12.0"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Muhamad Arga Reksapati"
},
{
"lang": "en",
"type": "remediation developer",
"value": "Daniel Stenberg"
}
],
"descriptions": [
{
"lang": "en",
"value": "Successfully using libcurl to do a transfer over a specific HTTP proxy\n(`proxyA`) with **Digest** authentication and then changing the proxy host to\na second one (`proxyB`) for a second transfer, reusing the same handle, makes\nlibcurl wrongly pass on the `Proxy-Authorization:` header field meant for\n`proxyA`, to `proxyB`."
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-294",
"description": "Authentication Bypass by Capture-replay",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-15T06:03:07.424Z",
"orgId": "2499f714-1537-4658-8207-48ae4bb9eae9",
"shortName": "curl"
},
"references": [
{
"url": "https://curl.se/docs/CVE-2026-7168.json"
},
{
"url": "https://curl.se/docs/CVE-2026-7168.html"
},
{
"url": "https://hackerone.com/reports/3697719"
}
],
"title": "cross-proxy Digest auth state leak",
"x_generator": {
"engine": "cvelib 1.8.0"
},
"x_osv": {
"affected": [
{
"ranges": [
{
"events": [
{
"introduced": "7.12.0"
},
{
"fixed": "8.14.2"
},
{
"introduced": "8.15.0"
},
{
"fixed": "8.16.1"
},
{
"introduced": "8.17.0"
},
{
"fixed": "8.20.0"
}
],
"type": "SEMVER"
},
{
"events": [
{
"introduced": "fc6eff13b5414caf6edf22d73a3239e074a04216"
},
{
"fixed": "c1cfdf59acbaf9504c4578d4cf56cdd7c8594507"
}
],
"repo": "https://github.com/curl/curl.git",
"type": "GIT"
}
],
"versions": [
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"8.18.0",
"8.17.0",
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"8.11.0",
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"8.10.0",
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"8.9.0",
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"8.1.0",
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},
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"id": "CURL-CVE-2026-7168",
"modified": "2026-09-07T10:34:51.00Z",
"published": "2026-04-29T08:00:00.00Z",
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leak\", \"affected\": [{\"ranges\": [{\"type\": \"SEMVER\", \"events\": [{\"introduced\": \"7.12.0\"}, {\"fixed\": \"8.14.2\"}, {\"introduced\": \"8.15.0\"}, {\"fixed\": \"8.16.1\"}, {\"introduced\": \"8.17.0\"}, {\"fixed\": \"8.20.0\"}]}, {\"repo\": \"https://github.com/curl/curl.git\", \"type\": \"GIT\", \"events\": [{\"introduced\": \"fc6eff13b5414caf6edf22d73a3239e074a04216\"}, {\"fixed\": \"c1cfdf59acbaf9504c4578d4cf56cdd7c8594507\"}]}], \"versions\": [\"8.19.0\", \"8.18.0\", \"8.17.0\", \"8.16.0\", \"8.15.0\", \"8.14.1\", \"8.14.0\", \"8.13.0\", \"8.12.1\", \"8.12.0\", \"8.11.1\", \"8.11.0\", \"8.10.1\", \"8.10.0\", \"8.9.1\", \"8.9.0\", \"8.8.0\", \"8.7.1\", \"8.7.0\", \"8.6.0\", \"8.5.0\", \"8.4.0\", \"8.3.0\", \"8.2.1\", \"8.2.0\", \"8.1.2\", \"8.1.1\", \"8.1.0\", \"8.0.1\", \"8.0.0\", \"7.88.1\", \"7.88.0\", \"7.87.0\", \"7.86.0\", \"7.85.0\", \"7.84.0\", \"7.83.1\", \"7.83.0\", \"7.82.0\", \"7.81.0\", \"7.80.0\", \"7.79.1\", \"7.79.0\", \"7.78.0\", \"7.77.0\", \"7.76.1\", 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\"7.21.0\", \"7.20.1\", \"7.20.0\", \"7.19.7\", \"7.19.6\", \"7.19.5\", \"7.19.4\", \"7.19.3\", \"7.19.2\", \"7.19.1\", \"7.19.0\", \"7.18.2\", \"7.18.1\", \"7.18.0\", \"7.17.1\", \"7.17.0\", \"7.16.4\", \"7.16.3\", \"7.16.2\", \"7.16.1\", \"7.16.0\", \"7.15.5\", \"7.15.4\", \"7.15.3\", \"7.15.2\", \"7.15.1\", \"7.15.0\", \"7.14.1\", \"7.14.0\", \"7.13.2\", \"7.13.1\", \"7.13.0\", \"7.12.3\", \"7.12.2\", \"7.12.1\", \"7.12.0\"]}], \"modified\": \"2026-09-07T10:34:51.00Z\", \"published\": \"2026-04-29T08:00:00.00Z\", \"schema_version\": \"1.5.0\", \"database_specific\": {\"CWE\": {\"id\": \"CWE-294\", \"desc\": \"Authentication Bypass by Capture-replay\"}, \"URL\": \"https://curl.se/docs/CVE-2026-7168.json\", \"www\": \"https://curl.se/docs/CVE-2026-7168.html\", \"issue\": \"https://hackerone.com/reports/3697719\", \"affects\": \"lib\", \"package\": \"curl\", \"severity\": \"Medium\", \"last_affected\": \"8.19.0\"}}, \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": 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\"version\": \"7.55.0\"}, {\"status\": \"affected\", \"version\": \"7.54.1\"}, {\"status\": \"affected\", \"version\": \"7.54.0\"}, {\"status\": \"affected\", \"version\": \"7.53.1\"}, {\"status\": \"affected\", \"version\": \"7.53.0\"}, {\"status\": \"affected\", \"version\": \"7.52.1\"}, {\"status\": \"affected\", \"version\": \"7.52.0\"}, {\"status\": \"affected\", \"version\": \"7.51.0\"}, {\"status\": \"affected\", \"version\": \"7.50.3\"}, {\"status\": \"affected\", \"version\": \"7.50.2\"}, {\"status\": \"affected\", \"version\": \"7.50.1\"}, {\"status\": \"affected\", \"version\": \"7.50.0\"}, {\"status\": \"affected\", \"version\": \"7.49.1\"}, {\"status\": \"affected\", \"version\": \"7.49.0\"}, {\"status\": \"affected\", \"version\": \"7.48.0\"}, {\"status\": \"affected\", \"version\": \"7.47.1\"}, {\"status\": \"affected\", \"version\": \"7.47.0\"}, {\"status\": \"affected\", \"version\": \"7.46.0\"}, {\"status\": \"affected\", \"version\": \"7.45.0\"}, {\"status\": 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\"descriptions\": [{\"lang\": \"en\", \"value\": \"Successfully using libcurl to do a transfer over a specific HTTP proxy\\n(`proxyA`) with **Digest** authentication and then changing the proxy host to\\na second one (`proxyB`) for a second transfer, reusing the same handle, makes\\nlibcurl wrongly pass on the `Proxy-Authorization:` header field meant for\\n`proxyA`, to `proxyB`.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-294\", \"description\": \"Authentication Bypass by Capture-replay\"}]}], \"providerMetadata\": {\"orgId\": \"2499f714-1537-4658-8207-48ae4bb9eae9\", \"shortName\": \"curl\", \"dateUpdated\": \"2026-09-15T06:03:07.424Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-7168\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-15T06:03:07.424Z\", \"dateReserved\": \"2026-04-27T07:37:37.172Z\", \"assignerOrgId\": \"2499f714-1537-4658-8207-48ae4bb9eae9\", \"datePublished\": \"2026-05-13T08:29:08.900Z\", \"assignerShortName\": \"curl\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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