Action not permitted
Modal body text goes here.
Modal Title
Modal Body
GHSA-6G7G-56FM-F8MP
Vulnerability from github – Published: 2026-05-13 18:30 – Updated: 2026-05-13 18:30
VLAI
Details
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...
Severity
6.5 (Medium)
{
"affected": [],
"aliases": [
"CVE-2026-5545"
],
"database_specific": {
"cwe_ids": [
"CWE-613"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-05-13T13:01:56Z",
"severity": "MODERATE"
},
"details": "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...",
"id": "GHSA-6g7g-56fm-f8mp",
"modified": "2026-05-13T18:30:52Z",
"published": "2026-05-13T18:30:52Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-5545"
},
{
"type": "WEB",
"url": "https://hackerone.com/reports/3642555"
},
{
"type": "WEB",
"url": "https://curl.se/docs/CVE-2026-5545.html"
},
{
"type": "WEB",
"url": "https://curl.se/docs/CVE-2026-5545.json"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N",
"type": "CVSS_V3"
}
]
}
CVE-2026-5545 (GCVE-0-2026-5545)
Vulnerability from cvelistv5 – Published: 2026-05-13 08:27 – Updated: 2026-05-13 17:46
VLAI
EPSS
Title
wrong reuse of HTTP Negotiate connection
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...
Severity
6.5 (Medium)
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| curl | curl |
Affected:
8.19.0 , ≤ 8.19.0
(semver)
Affected: 8.18.0 , ≤ 8.18.0 (semver) Affected: 8.17.0 , ≤ 8.17.0 (semver) Affected: 8.16.0 , ≤ 8.16.0 (semver) Affected: 8.15.0 , ≤ 8.15.0 (semver) Affected: 8.14.1 , ≤ 8.14.1 (semver) Affected: 8.14.0 , ≤ 8.14.0 (semver) Affected: 8.13.0 , ≤ 8.13.0 (semver) Affected: 8.12.1 , ≤ 8.12.1 (semver) Affected: 8.12.0 , ≤ 8.12.0 (semver) Affected: 8.11.1 , ≤ 8.11.1 (semver) Affected: 8.11.0 , ≤ 8.11.0 (semver) Affected: 8.10.1 , ≤ 8.10.1 (semver) Affected: 8.10.0 , ≤ 8.10.0 (semver) Affected: 8.9.1 , ≤ 8.9.1 (semver) Affected: 8.9.0 , ≤ 8.9.0 (semver) Affected: 8.8.0 , ≤ 8.8.0 (semver) Affected: 8.7.1 , ≤ 8.7.1 (semver) Affected: 8.7.0 , ≤ 8.7.0 (semver) Affected: 8.6.0 , ≤ 8.6.0 (semver) Affected: 8.5.0 , ≤ 8.5.0 (semver) Affected: 8.4.0 , ≤ 8.4.0 (semver) Affected: 8.3.0 , ≤ 8.3.0 (semver) Affected: 8.2.1 , ≤ 8.2.1 (semver) Affected: 8.2.0 , ≤ 8.2.0 (semver) Affected: 8.1.2 , ≤ 8.1.2 (semver) Affected: 8.1.1 , ≤ 8.1.1 (semver) Affected: 8.1.0 , ≤ 8.1.0 (semver) Affected: 8.0.1 , ≤ 8.0.1 (semver) Affected: 8.0.0 , ≤ 8.0.0 (semver) Affected: 7.88.1 , ≤ 7.88.1 (semver) Affected: 7.88.0 , ≤ 7.88.0 (semver) Affected: 7.87.0 , ≤ 7.87.0 (semver) Affected: 7.86.0 , ≤ 7.86.0 (semver) Affected: 7.85.0 , ≤ 7.85.0 (semver) Affected: 7.84.0 , ≤ 7.84.0 (semver) Affected: 7.83.1 , ≤ 7.83.1 (semver) Affected: 7.83.0 , ≤ 7.83.0 (semver) Affected: 7.82.0 , ≤ 7.82.0 (semver) Affected: 7.81.0 , ≤ 7.81.0 (semver) Affected: 7.80.0 , ≤ 7.80.0 (semver) Affected: 7.79.1 , ≤ 7.79.1 (semver) Affected: 7.79.0 , ≤ 7.79.0 (semver) Affected: 7.78.0 , ≤ 7.78.0 (semver) Affected: 7.77.0 , ≤ 7.77.0 (semver) Affected: 7.76.1 , ≤ 7.76.1 (semver) Affected: 7.76.0 , ≤ 7.76.0 (semver) Affected: 7.75.0 , ≤ 7.75.0 (semver) Affected: 7.74.0 , ≤ 7.74.0 (semver) Affected: 7.73.0 , ≤ 7.73.0 (semver) Affected: 7.72.0 , ≤ 7.72.0 (semver) Affected: 7.71.1 , ≤ 7.71.1 (semver) Affected: 7.71.0 , ≤ 7.71.0 (semver) Affected: 7.70.0 , ≤ 7.70.0 (semver) Affected: 7.69.1 , ≤ 7.69.1 (semver) Affected: 7.69.0 , ≤ 7.69.0 (semver) Affected: 7.68.0 , ≤ 7.68.0 (semver) Affected: 7.67.0 , ≤ 7.67.0 (semver) Affected: 7.66.0 , ≤ 7.66.0 (semver) Affected: 7.65.3 , ≤ 7.65.3 (semver) Affected: 7.65.2 , ≤ 7.65.2 (semver) Affected: 7.65.1 , ≤ 7.65.1 (semver) Affected: 7.65.0 , ≤ 7.65.0 (semver) Affected: 7.64.1 , ≤ 7.64.1 (semver) Affected: 7.64.0 , ≤ 7.64.0 (semver) Affected: 7.63.0 , ≤ 7.63.0 (semver) Affected: 7.62.0 , ≤ 7.62.0 (semver) Affected: 7.61.1 , ≤ 7.61.1 (semver) Affected: 7.61.0 , ≤ 7.61.0 (semver) Affected: 7.60.0 , ≤ 7.60.0 (semver) Affected: 7.59.0 , ≤ 7.59.0 (semver) Affected: 7.58.0 , ≤ 7.58.0 (semver) Affected: 7.57.0 , ≤ 7.57.0 (semver) Affected: 7.56.1 , ≤ 7.56.1 (semver) Affected: 7.56.0 , ≤ 7.56.0 (semver) Affected: 7.55.1 , ≤ 7.55.1 (semver) Affected: 7.55.0 , ≤ 7.55.0 (semver) Affected: 7.54.1 , ≤ 7.54.1 (semver) Affected: 7.54.0 , ≤ 7.54.0 (semver) Affected: 7.53.1 , ≤ 7.53.1 (semver) Affected: 7.53.0 , ≤ 7.53.0 (semver) Affected: 7.52.1 , ≤ 7.52.1 (semver) Affected: 7.52.0 , ≤ 7.52.0 (semver) Affected: 7.51.0 , ≤ 7.51.0 (semver) Affected: 7.50.3 , ≤ 7.50.3 (semver) Affected: 7.50.2 , ≤ 7.50.2 (semver) Affected: 7.50.1 , ≤ 7.50.1 (semver) Affected: 7.50.0 , ≤ 7.50.0 (semver) Affected: 7.49.1 , ≤ 7.49.1 (semver) Affected: 7.49.0 , ≤ 7.49.0 (semver) Affected: 7.48.0 , ≤ 7.48.0 (semver) Affected: 7.47.1 , ≤ 7.47.1 (semver) Affected: 7.47.0 , ≤ 7.47.0 (semver) Affected: 7.46.0 , ≤ 7.46.0 (semver) Affected: 7.45.0 , ≤ 7.45.0 (semver) Affected: 7.44.0 , ≤ 7.44.0 (semver) Affected: 7.43.0 , ≤ 7.43.0 (semver) Affected: 7.42.1 , ≤ 7.42.1 (semver) Affected: 7.42.0 , ≤ 7.42.0 (semver) Affected: 7.41.0 , ≤ 7.41.0 (semver) Affected: 7.40.0 , ≤ 7.40.0 (semver) Affected: 7.39.0 , ≤ 7.39.0 (semver) Affected: 7.38.0 , ≤ 7.38.0 (semver) Affected: 7.37.1 , ≤ 7.37.1 (semver) Affected: 7.37.0 , ≤ 7.37.0 (semver) Affected: 7.36.0 , ≤ 7.36.0 (semver) Affected: 7.35.0 , ≤ 7.35.0 (semver) Affected: 7.34.0 , ≤ 7.34.0 (semver) Affected: 7.33.0 , ≤ 7.33.0 (semver) Affected: 7.32.0 , ≤ 7.32.0 (semver) Affected: 7.31.0 , ≤ 7.31.0 (semver) Affected: 7.30.0 , ≤ 7.30.0 (semver) Affected: 7.29.0 , ≤ 7.29.0 (semver) Affected: 7.28.1 , ≤ 7.28.1 (semver) Affected: 7.28.0 , ≤ 7.28.0 (semver) Affected: 7.27.0 , ≤ 7.27.0 (semver) Affected: 7.26.0 , ≤ 7.26.0 (semver) Affected: 7.25.0 , ≤ 7.25.0 (semver) Affected: 7.24.0 , ≤ 7.24.0 (semver) Affected: 7.23.1 , ≤ 7.23.1 (semver) Affected: 7.23.0 , ≤ 7.23.0 (semver) Affected: 7.22.0 , ≤ 7.22.0 (semver) Affected: 7.21.7 , ≤ 7.21.7 (semver) Affected: 7.21.6 , ≤ 7.21.6 (semver) Affected: 7.21.5 , ≤ 7.21.5 (semver) Affected: 7.21.4 , ≤ 7.21.4 (semver) Affected: 7.21.3 , ≤ 7.21.3 (semver) Affected: 7.21.2 , ≤ 7.21.2 (semver) Affected: 7.21.1 , ≤ 7.21.1 (semver) Affected: 7.21.0 , ≤ 7.21.0 (semver) Affected: 7.20.1 , ≤ 7.20.1 (semver) Affected: 7.20.0 , ≤ 7.20.0 (semver) Affected: 7.19.7 , ≤ 7.19.7 (semver) Affected: 7.19.6 , ≤ 7.19.6 (semver) Affected: 7.19.5 , ≤ 7.19.5 (semver) Affected: 7.19.4 , ≤ 7.19.4 (semver) Affected: 7.19.3 , ≤ 7.19.3 (semver) Affected: 7.19.2 , ≤ 7.19.2 (semver) Affected: 7.19.1 , ≤ 7.19.1 (semver) Affected: 7.19.0 , ≤ 7.19.0 (semver) Affected: 7.18.2 , ≤ 7.18.2 (semver) Affected: 7.18.1 , ≤ 7.18.1 (semver) Affected: 7.18.0 , ≤ 7.18.0 (semver) Affected: 7.17.1 , ≤ 7.17.1 (semver) Affected: 7.17.0 , ≤ 7.17.0 (semver) Affected: 7.16.4 , ≤ 7.16.4 (semver) Affected: 7.16.3 , ≤ 7.16.3 (semver) Affected: 7.16.2 , ≤ 7.16.2 (semver) Affected: 7.16.1 , ≤ 7.16.1 (semver) Affected: 7.16.0 , ≤ 7.16.0 (semver) Affected: 7.15.5 , ≤ 7.15.5 (semver) Affected: 7.15.4 , ≤ 7.15.4 (semver) Affected: 7.15.3 , ≤ 7.15.3 (semver) Affected: 7.15.2 , ≤ 7.15.2 (semver) Affected: 7.15.1 , ≤ 7.15.1 (semver) Affected: 7.15.0 , ≤ 7.15.0 (semver) Affected: 7.14.1 , ≤ 7.14.1 (semver) Affected: 7.14.0 , ≤ 7.14.0 (semver) Affected: 7.13.2 , ≤ 7.13.2 (semver) Affected: 7.13.1 , ≤ 7.13.1 (semver) Affected: 7.13.0 , ≤ 7.13.0 (semver) Affected: 7.12.3 , ≤ 7.12.3 (semver) Affected: 7.12.2 , ≤ 7.12.2 (semver) Affected: 7.12.1 , ≤ 7.12.1 (semver) Affected: 7.12.0 , ≤ 7.12.0 (semver) Affected: 7.11.2 , ≤ 7.11.2 (semver) Affected: 7.11.1 , ≤ 7.11.1 (semver) Affected: 7.11.0 , ≤ 7.11.0 (semver) Affected: 7.10.8 , ≤ 7.10.8 (semver) Affected: 7.10.7 , ≤ 7.10.7 (semver) Affected: 7.10.6 , ≤ 7.10.6 (semver) |
Credits
Quac Tran and Ngoc Hieu
Stefan Eissing
{
"containers": {
"adp": [
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"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",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2026-5545",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-05-13T17:46:36.115262Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-05-13T17:46:40.830Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"references": [
{
"tags": [
"exploit"
],
"url": "https://hackerone.com/reports/3642555"
}
],
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "curl",
"vendor": "curl",
"versions": [
{
"lessThanOrEqual": "8.19.0",
"status": "affected",
"version": "8.19.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.18.0",
"status": "affected",
"version": "8.18.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.17.0",
"status": "affected",
"version": "8.17.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.16.0",
"status": "affected",
"version": "8.16.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.15.0",
"status": "affected",
"version": "8.15.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.14.1",
"status": "affected",
"version": "8.14.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.14.0",
"status": "affected",
"version": "8.14.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.13.0",
"status": "affected",
"version": "8.13.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.12.1",
"status": "affected",
"version": "8.12.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.12.0",
"status": "affected",
"version": "8.12.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.11.1",
"status": "affected",
"version": "8.11.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.11.0",
"status": "affected",
"version": "8.11.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.10.1",
"status": "affected",
"version": "8.10.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.10.0",
"status": "affected",
"version": "8.10.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.9.1",
"status": "affected",
"version": "8.9.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.9.0",
"status": "affected",
"version": "8.9.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.8.0",
"status": "affected",
"version": "8.8.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.7.1",
"status": "affected",
"version": "8.7.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.7.0",
"status": "affected",
"version": "8.7.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.6.0",
"status": "affected",
"version": "8.6.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.5.0",
"status": "affected",
"version": "8.5.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.4.0",
"status": "affected",
"version": "8.4.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.3.0",
"status": "affected",
"version": "8.3.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.2.1",
"status": "affected",
"version": "8.2.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.2.0",
"status": "affected",
"version": "8.2.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.1.2",
"status": "affected",
"version": "8.1.2",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.1.1",
"status": "affected",
"version": "8.1.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.1.0",
"status": "affected",
"version": "8.1.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.0.1",
"status": "affected",
"version": "8.0.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.0.0",
"status": "affected",
"version": "8.0.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.88.1",
"status": "affected",
"version": "7.88.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.88.0",
"status": "affected",
"version": "7.88.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.87.0",
"status": "affected",
"version": "7.87.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.86.0",
"status": "affected",
"version": "7.86.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.85.0",
"status": "affected",
"version": "7.85.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.84.0",
"status": "affected",
"version": "7.84.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.83.1",
"status": "affected",
"version": "7.83.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.83.0",
"status": "affected",
"version": "7.83.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.82.0",
"status": "affected",
"version": "7.82.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.81.0",
"status": "affected",
"version": "7.81.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.80.0",
"status": "affected",
"version": "7.80.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.79.1",
"status": "affected",
"version": "7.79.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.79.0",
"status": "affected",
"version": "7.79.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.78.0",
"status": "affected",
"version": "7.78.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.77.0",
"status": "affected",
"version": "7.77.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.76.1",
"status": "affected",
"version": "7.76.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.76.0",
"status": "affected",
"version": "7.76.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.75.0",
"status": "affected",
"version": "7.75.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.74.0",
"status": "affected",
"version": "7.74.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.73.0",
"status": "affected",
"version": "7.73.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.72.0",
"status": "affected",
"version": "7.72.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.71.1",
"status": "affected",
"version": "7.71.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.71.0",
"status": "affected",
"version": "7.71.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.70.0",
"status": "affected",
"version": "7.70.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.69.1",
"status": "affected",
"version": "7.69.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.69.0",
"status": "affected",
"version": "7.69.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.68.0",
"status": "affected",
"version": "7.68.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.67.0",
"status": "affected",
"version": "7.67.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.66.0",
"status": "affected",
"version": "7.66.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.65.3",
"status": "affected",
"version": "7.65.3",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.65.2",
"status": "affected",
"version": "7.65.2",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.65.1",
"status": "affected",
"version": "7.65.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.65.0",
"status": "affected",
"version": "7.65.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.64.1",
"status": "affected",
"version": "7.64.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.64.0",
"status": "affected",
"version": "7.64.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.63.0",
"status": "affected",
"version": "7.63.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.62.0",
"status": "affected",
"version": "7.62.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.61.1",
"status": "affected",
"version": "7.61.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.61.0",
"status": "affected",
"version": "7.61.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.60.0",
"status": "affected",
"version": "7.60.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.59.0",
"status": "affected",
"version": "7.59.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.58.0",
"status": "affected",
"version": "7.58.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.57.0",
"status": "affected",
"version": "7.57.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.56.1",
"status": "affected",
"version": "7.56.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.56.0",
"status": "affected",
"version": "7.56.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.55.1",
"status": "affected",
"version": "7.55.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.55.0",
"status": "affected",
"version": "7.55.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.54.1",
"status": "affected",
"version": "7.54.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.54.0",
"status": "affected",
"version": "7.54.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.53.1",
"status": "affected",
"version": "7.53.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.53.0",
"status": "affected",
"version": "7.53.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.52.1",
"status": "affected",
"version": "7.52.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.52.0",
"status": "affected",
"version": "7.52.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.51.0",
"status": "affected",
"version": "7.51.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.50.3",
"status": "affected",
"version": "7.50.3",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.50.2",
"status": "affected",
"version": "7.50.2",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.50.1",
"status": "affected",
"version": "7.50.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.50.0",
"status": "affected",
"version": "7.50.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.49.1",
"status": "affected",
"version": "7.49.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.49.0",
"status": "affected",
"version": "7.49.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.48.0",
"status": "affected",
"version": "7.48.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.47.1",
"status": "affected",
"version": "7.47.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.47.0",
"status": "affected",
"version": "7.47.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.46.0",
"status": "affected",
"version": "7.46.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.45.0",
"status": "affected",
"version": "7.45.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.44.0",
"status": "affected",
"version": "7.44.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.43.0",
"status": "affected",
"version": "7.43.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.42.1",
"status": "affected",
"version": "7.42.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.42.0",
"status": "affected",
"version": "7.42.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.41.0",
"status": "affected",
"version": "7.41.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.40.0",
"status": "affected",
"version": "7.40.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.39.0",
"status": "affected",
"version": "7.39.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.38.0",
"status": "affected",
"version": "7.38.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.37.1",
"status": "affected",
"version": "7.37.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.37.0",
"status": "affected",
"version": "7.37.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.36.0",
"status": "affected",
"version": "7.36.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.35.0",
"status": "affected",
"version": "7.35.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.34.0",
"status": "affected",
"version": "7.34.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.33.0",
"status": "affected",
"version": "7.33.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.32.0",
"status": "affected",
"version": "7.32.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.31.0",
"status": "affected",
"version": "7.31.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.30.0",
"status": "affected",
"version": "7.30.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.29.0",
"status": "affected",
"version": "7.29.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.28.1",
"status": "affected",
"version": "7.28.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.28.0",
"status": "affected",
"version": "7.28.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.27.0",
"status": "affected",
"version": "7.27.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.26.0",
"status": "affected",
"version": "7.26.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.25.0",
"status": "affected",
"version": "7.25.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.24.0",
"status": "affected",
"version": "7.24.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.23.1",
"status": "affected",
"version": "7.23.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.23.0",
"status": "affected",
"version": "7.23.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.22.0",
"status": "affected",
"version": "7.22.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.21.7",
"status": "affected",
"version": "7.21.7",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.21.6",
"status": "affected",
"version": "7.21.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.21.5",
"status": "affected",
"version": "7.21.5",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.21.4",
"status": "affected",
"version": "7.21.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.21.3",
"status": "affected",
"version": "7.21.3",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.21.2",
"status": "affected",
"version": "7.21.2",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.21.1",
"status": "affected",
"version": "7.21.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.21.0",
"status": "affected",
"version": "7.21.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.20.1",
"status": "affected",
"version": "7.20.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.20.0",
"status": "affected",
"version": "7.20.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.19.7",
"status": "affected",
"version": "7.19.7",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.19.6",
"status": "affected",
"version": "7.19.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.19.5",
"status": "affected",
"version": "7.19.5",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.19.4",
"status": "affected",
"version": "7.19.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.19.3",
"status": "affected",
"version": "7.19.3",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.19.2",
"status": "affected",
"version": "7.19.2",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.19.1",
"status": "affected",
"version": "7.19.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.19.0",
"status": "affected",
"version": "7.19.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.18.2",
"status": "affected",
"version": "7.18.2",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.18.1",
"status": "affected",
"version": "7.18.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.18.0",
"status": "affected",
"version": "7.18.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.17.1",
"status": "affected",
"version": "7.17.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.17.0",
"status": "affected",
"version": "7.17.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.16.4",
"status": "affected",
"version": "7.16.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.16.3",
"status": "affected",
"version": "7.16.3",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.16.2",
"status": "affected",
"version": "7.16.2",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.16.1",
"status": "affected",
"version": "7.16.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.16.0",
"status": "affected",
"version": "7.16.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.15.5",
"status": "affected",
"version": "7.15.5",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.15.4",
"status": "affected",
"version": "7.15.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.15.3",
"status": "affected",
"version": "7.15.3",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.15.2",
"status": "affected",
"version": "7.15.2",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.15.1",
"status": "affected",
"version": "7.15.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.15.0",
"status": "affected",
"version": "7.15.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.14.1",
"status": "affected",
"version": "7.14.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.14.0",
"status": "affected",
"version": "7.14.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.13.2",
"status": "affected",
"version": "7.13.2",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.13.1",
"status": "affected",
"version": "7.13.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.13.0",
"status": "affected",
"version": "7.13.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.12.3",
"status": "affected",
"version": "7.12.3",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.12.2",
"status": "affected",
"version": "7.12.2",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.12.1",
"status": "affected",
"version": "7.12.1",
"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"
}
Loading…
Trend slope:
-
(linear fit over daily sighting counts)
Show additional events:
Loading…
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.
Loading…
Loading…