CVE-2026-5545 (GCVE-0-2026-5545)
Vulnerability from cvelistv5
Published
2026-05-13 08:27
Modified
2026-05-13 17:46
Severity ?
VLAI Severity ?
EPSS score ?
Summary
libcurl might in some circumstances reuse the wrong connection when asked to
do an authenticated HTTP(S) request after a Negotiate-authenticated one, when
both use the same host.
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 request that was issued by an application could
wrongfully reuse an existing connection to the same server that was
authenticated using different credentials.
An application that first uses Negotiate authentication to a server with
`user1:password1` and then does another operation to the same server asking
for any authentication method but for `user2:password2` (while the previous
connection is still alive) - the second request gets confused and wrongly
reuses the same connection and sends the new request over that connection
thinking it uses a mix of user1's and user2's credentials when it is in fact
still using the connection authenticated for user1...
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| curl | curl |
Version: 8.19.0 ≤ 8.19.0 Version: 8.18.0 ≤ 8.18.0 Version: 8.17.0 ≤ 8.17.0 Version: 8.16.0 ≤ 8.16.0 Version: 8.15.0 ≤ 8.15.0 Version: 8.14.1 ≤ 8.14.1 Version: 8.14.0 ≤ 8.14.0 Version: 8.13.0 ≤ 8.13.0 Version: 8.12.1 ≤ 8.12.1 Version: 8.12.0 ≤ 8.12.0 Version: 8.11.1 ≤ 8.11.1 Version: 8.11.0 ≤ 8.11.0 Version: 8.10.1 ≤ 8.10.1 Version: 8.10.0 ≤ 8.10.0 Version: 8.9.1 ≤ 8.9.1 Version: 8.9.0 ≤ 8.9.0 Version: 8.8.0 ≤ 8.8.0 Version: 8.7.1 ≤ 8.7.1 Version: 8.7.0 ≤ 8.7.0 Version: 8.6.0 ≤ 8.6.0 Version: 8.5.0 ≤ 8.5.0 Version: 8.4.0 ≤ 8.4.0 Version: 8.3.0 ≤ 8.3.0 Version: 8.2.1 ≤ 8.2.1 Version: 8.2.0 ≤ 8.2.0 Version: 8.1.2 ≤ 8.1.2 Version: 8.1.1 ≤ 8.1.1 Version: 8.1.0 ≤ 8.1.0 Version: 8.0.1 ≤ 8.0.1 Version: 8.0.0 ≤ 8.0.0 Version: 7.88.1 ≤ 7.88.1 Version: 7.88.0 ≤ 7.88.0 Version: 7.87.0 ≤ 7.87.0 Version: 7.86.0 ≤ 7.86.0 Version: 7.85.0 ≤ 7.85.0 Version: 7.84.0 ≤ 7.84.0 Version: 7.83.1 ≤ 7.83.1 Version: 7.83.0 ≤ 7.83.0 Version: 7.82.0 ≤ 7.82.0 Version: 7.81.0 ≤ 7.81.0 Version: 7.80.0 ≤ 7.80.0 Version: 7.79.1 ≤ 7.79.1 Version: 7.79.0 ≤ 7.79.0 Version: 7.78.0 ≤ 7.78.0 Version: 7.77.0 ≤ 7.77.0 Version: 7.76.1 ≤ 7.76.1 Version: 7.76.0 ≤ 7.76.0 Version: 7.75.0 ≤ 7.75.0 Version: 7.74.0 ≤ 7.74.0 Version: 7.73.0 ≤ 7.73.0 Version: 7.72.0 ≤ 7.72.0 Version: 7.71.1 ≤ 7.71.1 Version: 7.71.0 ≤ 7.71.0 Version: 7.70.0 ≤ 7.70.0 Version: 7.69.1 ≤ 7.69.1 Version: 7.69.0 ≤ 7.69.0 Version: 7.68.0 ≤ 7.68.0 Version: 7.67.0 ≤ 7.67.0 Version: 7.66.0 ≤ 7.66.0 Version: 7.65.3 ≤ 7.65.3 Version: 7.65.2 ≤ 7.65.2 Version: 7.65.1 ≤ 7.65.1 Version: 7.65.0 ≤ 7.65.0 Version: 7.64.1 ≤ 7.64.1 Version: 7.64.0 ≤ 7.64.0 Version: 7.63.0 ≤ 7.63.0 Version: 7.62.0 ≤ 7.62.0 Version: 7.61.1 ≤ 7.61.1 Version: 7.61.0 ≤ 7.61.0 Version: 7.60.0 ≤ 7.60.0 Version: 7.59.0 ≤ 7.59.0 Version: 7.58.0 ≤ 7.58.0 Version: 7.57.0 ≤ 7.57.0 Version: 7.56.1 ≤ 7.56.1 Version: 7.56.0 ≤ 7.56.0 Version: 7.55.1 ≤ 7.55.1 Version: 7.55.0 ≤ 7.55.0 Version: 7.54.1 ≤ 7.54.1 Version: 7.54.0 ≤ 7.54.0 Version: 7.53.1 ≤ 7.53.1 Version: 7.53.0 ≤ 7.53.0 Version: 7.52.1 ≤ 7.52.1 Version: 7.52.0 ≤ 7.52.0 Version: 7.51.0 ≤ 7.51.0 Version: 7.50.3 ≤ 7.50.3 Version: 7.50.2 ≤ 7.50.2 Version: 7.50.1 ≤ 7.50.1 Version: 7.50.0 ≤ 7.50.0 Version: 7.49.1 ≤ 7.49.1 Version: 7.49.0 ≤ 7.49.0 Version: 7.48.0 ≤ 7.48.0 Version: 7.47.1 ≤ 7.47.1 Version: 7.47.0 ≤ 7.47.0 Version: 7.46.0 ≤ 7.46.0 Version: 7.45.0 ≤ 7.45.0 Version: 7.44.0 ≤ 7.44.0 Version: 7.43.0 ≤ 7.43.0 Version: 7.42.1 ≤ 7.42.1 Version: 7.42.0 ≤ 7.42.0 Version: 7.41.0 ≤ 7.41.0 Version: 7.40.0 ≤ 7.40.0 Version: 7.39.0 ≤ 7.39.0 Version: 7.38.0 ≤ 7.38.0 Version: 7.37.1 ≤ 7.37.1 Version: 7.37.0 ≤ 7.37.0 Version: 7.36.0 ≤ 7.36.0 Version: 7.35.0 ≤ 7.35.0 Version: 7.34.0 ≤ 7.34.0 Version: 7.33.0 ≤ 7.33.0 Version: 7.32.0 ≤ 7.32.0 Version: 7.31.0 ≤ 7.31.0 Version: 7.30.0 ≤ 7.30.0 Version: 7.29.0 ≤ 7.29.0 Version: 7.28.1 ≤ 7.28.1 Version: 7.28.0 ≤ 7.28.0 Version: 7.27.0 ≤ 7.27.0 Version: 7.26.0 ≤ 7.26.0 Version: 7.25.0 ≤ 7.25.0 Version: 7.24.0 ≤ 7.24.0 Version: 7.23.1 ≤ 7.23.1 Version: 7.23.0 ≤ 7.23.0 Version: 7.22.0 ≤ 7.22.0 Version: 7.21.7 ≤ 7.21.7 Version: 7.21.6 ≤ 7.21.6 Version: 7.21.5 ≤ 7.21.5 Version: 7.21.4 ≤ 7.21.4 Version: 7.21.3 ≤ 7.21.3 Version: 7.21.2 ≤ 7.21.2 Version: 7.21.1 ≤ 7.21.1 Version: 7.21.0 ≤ 7.21.0 Version: 7.20.1 ≤ 7.20.1 Version: 7.20.0 ≤ 7.20.0 Version: 7.19.7 ≤ 7.19.7 Version: 7.19.6 ≤ 7.19.6 Version: 7.19.5 ≤ 7.19.5 Version: 7.19.4 ≤ 7.19.4 Version: 7.19.3 ≤ 7.19.3 Version: 7.19.2 ≤ 7.19.2 Version: 7.19.1 ≤ 7.19.1 Version: 7.19.0 ≤ 7.19.0 Version: 7.18.2 ≤ 7.18.2 Version: 7.18.1 ≤ 7.18.1 Version: 7.18.0 ≤ 7.18.0 Version: 7.17.1 ≤ 7.17.1 Version: 7.17.0 ≤ 7.17.0 Version: 7.16.4 ≤ 7.16.4 Version: 7.16.3 ≤ 7.16.3 Version: 7.16.2 ≤ 7.16.2 Version: 7.16.1 ≤ 7.16.1 Version: 7.16.0 ≤ 7.16.0 Version: 7.15.5 ≤ 7.15.5 Version: 7.15.4 ≤ 7.15.4 Version: 7.15.3 ≤ 7.15.3 Version: 7.15.2 ≤ 7.15.2 Version: 7.15.1 ≤ 7.15.1 Version: 7.15.0 ≤ 7.15.0 Version: 7.14.1 ≤ 7.14.1 Version: 7.14.0 ≤ 7.14.0 Version: 7.13.2 ≤ 7.13.2 Version: 7.13.1 ≤ 7.13.1 Version: 7.13.0 ≤ 7.13.0 Version: 7.12.3 ≤ 7.12.3 Version: 7.12.2 ≤ 7.12.2 Version: 7.12.1 ≤ 7.12.1 Version: 7.12.0 ≤ 7.12.0 Version: 7.11.2 ≤ 7.11.2 Version: 7.11.1 ≤ 7.11.1 Version: 7.11.0 ≤ 7.11.0 Version: 7.10.8 ≤ 7.10.8 Version: 7.10.7 ≤ 7.10.7 Version: 7.10.6 ≤ 7.10.6 |
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"attackVector": "NETWORK",
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"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N",
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"role": "CISA Coordinator",
"timestamp": "2026-05-13T17:46:36.115262Z",
"version": "2.0.3"
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{
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{
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},
{
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},
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
"lessThanOrEqual": "7.13.2",
"status": "affected",
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"versionType": "semver"
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{
"lessThanOrEqual": "7.13.1",
"status": "affected",
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"versionType": "semver"
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{
"lessThanOrEqual": "7.13.0",
"status": "affected",
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"versionType": "semver"
},
{
"lessThanOrEqual": "7.12.3",
"status": "affected",
"version": "7.12.3",
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},
{
"lessThanOrEqual": "7.12.2",
"status": "affected",
"version": "7.12.2",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.12.1",
"status": "affected",
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"versionType": "semver"
},
{
"lessThanOrEqual": "7.12.0",
"status": "affected",
"version": "7.12.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.11.2",
"status": "affected",
"version": "7.11.2",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.11.1",
"status": "affected",
"version": "7.11.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.11.0",
"status": "affected",
"version": "7.11.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.10.8",
"status": "affected",
"version": "7.10.8",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.10.7",
"status": "affected",
"version": "7.10.7",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.10.6",
"status": "affected",
"version": "7.10.6",
"versionType": "semver"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Quac Tran and Ngoc Hieu"
},
{
"lang": "en",
"type": "remediation developer",
"value": "Stefan Eissing"
}
],
"descriptions": [
{
"lang": "en",
"value": "libcurl might in some circumstances reuse the wrong connection when asked to\ndo an authenticated HTTP(S) request after a Negotiate-authenticated one, when\nboth use the same host.\n\nlibcurl features a pool of recent connections so that subsequent requests can\nreuse an existing connection to avoid overhead.\n\nWhen reusing a connection a range of criteria must be met. Due to a logical\nerror in the code, a request that was issued by an application could\nwrongfully reuse an existing connection to the same server that was\nauthenticated using different credentials.\n\nAn application that first uses Negotiate authentication to a server with\n`user1:password1` and then does another operation to the same server asking\nfor any authentication method but for `user2:password2` (while the previous\nconnection is still alive) - the second request gets confused and wrongly\nreuses the same connection and sends the new request over that connection\nthinking it uses a mix of user1\u0027s and user2\u0027s credentials when it is in fact\nstill using the connection authenticated for user1..."
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "CWE-305 Authentication Bypass by Primary Weakness",
"lang": "en"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-05-13T08:27:26.065Z",
"orgId": "2499f714-1537-4658-8207-48ae4bb9eae9",
"shortName": "curl"
},
"references": [
{
"name": "json",
"url": "https://curl.se/docs/CVE-2026-5545.json"
},
{
"name": "www",
"url": "https://curl.se/docs/CVE-2026-5545.html"
},
{
"name": "issue",
"url": "https://hackerone.com/reports/3642555"
}
],
"title": "wrong reuse of HTTP Negotiate connection"
}
},
"cveMetadata": {
"assignerOrgId": "2499f714-1537-4658-8207-48ae4bb9eae9",
"assignerShortName": "curl",
"cveId": "CVE-2026-5545",
"datePublished": "2026-05-13T08:27:26.065Z",
"dateReserved": "2026-04-04T12:10:07.125Z",
"dateUpdated": "2026-05-13T17:46:40.830Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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