CVE-2026-6429 (GCVE-0-2026-6429)
Vulnerability from cvelistv5 – Published: 2026-05-13 08:28 – Updated: 2026-09-15 06:03
VLAI
EPSS
VEX
Title
netrc credential leak with reused proxy connection
Summary
When asked to both use a `.netrc` file for credentials and to follow HTTP
redirects, libcurl could leak the password used for the first host to the
followed-to host under certain circumstances.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-13 14:03 UTC
CWE
- CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
Assigner
References
Impacted products
3 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| curl | curl |
Affected:
7.14.0 , < 8.14.2
(semver)
Affected: 8.15.0 , < 8.16.1 (semver) Affected: 8.17.0 , < 8.20.0 (semver) |
guessed | |
| curl | curl |
Affected:
01165e08e0d131b399fba2190f17af67e66f0888 , < b4024bf808bd558026fdc6096e8457f199ace306
(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 |
guessed |
{
"containers": {
"adp": [
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2026-6429",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-05-13T14:03:52.312824Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
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"version": "8.7.0"
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"version": "7.76.1"
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"version": "7.75.0"
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"version": "7.74.0"
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"version": "7.73.0"
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"version": "7.72.0"
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"version": "7.71.1"
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"version": "7.71.0"
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"version": "7.70.0"
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"version": "7.69.1"
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"version": "7.69.0"
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"version": "7.68.0"
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"version": "7.41.0"
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"version": "7.28.1"
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"version": "7.28.0"
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"version": "7.27.0"
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{
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"version": "7.26.0"
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{
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"version": "7.25.0"
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{
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"version": "7.24.0"
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"version": "7.23.1"
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},
{
"status": "affected",
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},
{
"status": "affected",
"version": "7.19.7"
},
{
"status": "affected",
"version": "7.19.6"
},
{
"status": "affected",
"version": "7.19.5"
},
{
"status": "affected",
"version": "7.19.4"
},
{
"status": "affected",
"version": "7.19.3"
},
{
"status": "affected",
"version": "7.19.2"
},
{
"status": "affected",
"version": "7.19.1"
},
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"status": "affected",
"version": "7.19.0"
},
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"status": "affected",
"version": "7.18.2"
},
{
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"version": "7.18.1"
},
{
"status": "affected",
"version": "7.18.0"
},
{
"status": "affected",
"version": "7.17.1"
},
{
"status": "affected",
"version": "7.17.0"
},
{
"status": "affected",
"version": "7.16.4"
},
{
"status": "affected",
"version": "7.16.3"
},
{
"status": "affected",
"version": "7.16.2"
},
{
"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"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Muhamad Arga Reksapati"
},
{
"lang": "en",
"type": "remediation developer",
"value": "Daniel Stenberg"
}
],
"descriptions": [
{
"lang": "en",
"value": "When asked to both use a `.netrc` file for credentials and to follow HTTP\nredirects, libcurl could leak the password used for the first host to the\nfollowed-to host under certain circumstances."
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-200",
"description": "Exposure of Sensitive Information to an Unauthorized Actor",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-15T06:03:05.855Z",
"orgId": "2499f714-1537-4658-8207-48ae4bb9eae9",
"shortName": "curl"
},
"references": [
{
"url": "https://curl.se/docs/CVE-2026-6429.json"
},
{
"url": "https://curl.se/docs/CVE-2026-6429.html"
},
{
"url": "https://hackerone.com/reports/3677759"
}
],
"title": "netrc credential leak with reused proxy connection",
"x_generator": {
"engine": "cvelib 1.8.0"
},
"x_osv": {
"affected": [
{
"ranges": [
{
"events": [
{
"introduced": "7.14.0"
},
{
"fixed": "8.14.2"
},
{
"introduced": "8.15.0"
},
{
"fixed": "8.16.1"
},
{
"introduced": "8.17.0"
},
{
"fixed": "8.20.0"
}
],
"type": "SEMVER"
},
{
"events": [
{
"introduced": "01165e08e0d131b399fba2190f17af67e66f0888"
},
{
"fixed": "b4024bf808bd558026fdc6096e8457f199ace306"
}
],
"repo": "https://github.com/curl/curl.git",
"type": "GIT"
}
],
"versions": [
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"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",
"7.76.0",
"7.75.0",
"7.74.0",
"7.73.0",
"7.72.0",
"7.71.1",
"7.71.0",
"7.70.0",
"7.69.1",
"7.69.0",
"7.68.0",
"7.67.0",
"7.66.0",
"7.65.3",
"7.65.2",
"7.65.1",
"7.65.0",
"7.64.1",
"7.64.0",
"7.63.0",
"7.62.0",
"7.61.1",
"7.61.0",
"7.60.0",
"7.59.0",
"7.58.0",
"7.57.0",
"7.56.1",
"7.56.0",
"7.55.1",
"7.55.0",
"7.54.1",
"7.54.0",
"7.53.1",
"7.53.0",
"7.52.1",
"7.52.0",
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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},
"title": "CISA ADP Vulnrichment"
}
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{
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},
{
"status": "affected",
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},
{
"status": "affected",
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},
{
"status": "affected",
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}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Muhamad Arga Reksapati"
},
{
"lang": "en",
"type": "remediation developer",
"value": "Daniel Stenberg"
}
],
"descriptions": [
{
"lang": "en",
"value": "When asked to both use a `.netrc` file for credentials and to follow HTTP\nredirects, libcurl could leak the password used for the first host to the\nfollowed-to host under certain circumstances."
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-200",
"description": "Exposure of Sensitive Information to an Unauthorized Actor",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-15T06:03:05.855Z",
"orgId": "2499f714-1537-4658-8207-48ae4bb9eae9",
"shortName": "curl"
},
"references": [
{
"url": "https://curl.se/docs/CVE-2026-6429.json"
},
{
"url": "https://curl.se/docs/CVE-2026-6429.html"
},
{
"url": "https://hackerone.com/reports/3677759"
}
],
"title": "netrc credential leak with reused proxy connection",
"x_generator": {
"engine": "cvelib 1.8.0"
},
"x_osv": {
"affected": [
{
"ranges": [
{
"events": [
{
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},
{
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},
{
"introduced": "8.15.0"
},
{
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},
{
"introduced": "8.17.0"
},
{
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}
],
"type": "SEMVER"
},
{
"events": [
{
"introduced": "01165e08e0d131b399fba2190f17af67e66f0888"
},
{
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}
],
"repo": "https://github.com/curl/curl.git",
"type": "GIT"
}
],
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],
"aliases": [
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],
"credits": [
{
"name": "Muhamad Arga Reksapati",
"type": "finder"
},
{
"name": "Daniel Stenberg",
"type": "remediation developer"
}
],
"database_specific": {
"CWE": {
"desc": "Exposure of Sensitive Information to an Unauthorized Actor",
"id": "CWE-200"
},
"URL": "https://curl.se/docs/CVE-2026-6429.json",
"affects": "lib",
"issue": "https://hackerone.com/reports/3677759",
"last_affected": "8.19.0",
"package": "curl",
"severity": "Medium",
"www": "https://curl.se/docs/CVE-2026-6429.html"
},
"details": "When asked to both use a `.netrc` file for credentials and to follow HTTP\nredirects, libcurl could leak the password used for the first host to the\nfollowed-to host under certain circumstances.",
"id": "CURL-CVE-2026-6429",
"modified": "2026-09-07T10:34:51.00Z",
"published": "2026-04-29T08:00:00.00Z",
"schema_version": "1.5.0",
"summary": "netrc credential leak with reused proxy connection"
}
}
},
"cveMetadata": {
"assignerOrgId": "2499f714-1537-4658-8207-48ae4bb9eae9",
"assignerShortName": "curl",
"cveId": "CVE-2026-6429",
"datePublished": "2026-05-13T08:28:36.166Z",
"dateReserved": "2026-04-16T14:48:02.991Z",
"dateUpdated": "2026-09-15T06:03:05.855Z",
"state": "PUBLISHED"
},
"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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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