CVE-2026-8286 (GCVE-0-2026-8286)

Vulnerability from cvelistv5 – Published: 2026-07-03 06:14 – Updated: 2026-07-06 17:33
VLAI
Title
wrong STARTTLS connection reuse
Summary
A vulnerability exists where a new transfer that uses STARTTLS to upgrade the connection might reuse an existing live connection even though the TLS configuration mismatches so it should not.
Severity
8.1 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
SSVC
Exploitation: poc Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-06 17:33 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
curl curl Affected: 8.20.0 , ≤ 8.20.0 (semver)
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)
guessed Create a notification for this product.
Credits
Andrew Nesbitt (powered by Mythos) Stefan Eissing
Show details on NVD website
To clipboard 

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              "status": "affected",
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              "lessThanOrEqual": "8.8.0",
              "status": "affected",
              "version": "8.8.0",
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            {
              "lessThanOrEqual": "8.7.1",
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              "lessThanOrEqual": "8.6.0",
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              "status": "affected",
              "version": "8.0.1",
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              "lessThanOrEqual": "8.0.0",
              "status": "affected",
              "version": "8.0.0",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "7.88.1",
              "status": "affected",
              "version": "7.88.1",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "7.88.0",
              "status": "affected",
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              "lessThanOrEqual": "7.87.0",
              "status": "affected",
              "version": "7.87.0",
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            {
              "lessThanOrEqual": "7.86.0",
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            {
              "lessThanOrEqual": "7.85.0",
              "status": "affected",
              "version": "7.85.0",
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            {
              "lessThanOrEqual": "7.84.0",
              "status": "affected",
              "version": "7.84.0",
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            {
              "lessThanOrEqual": "7.83.1",
              "status": "affected",
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              "lessThanOrEqual": "7.81.0",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "curl: curl: Insecure connection establishment due to TLS configuration mismatch",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-8286.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-08-21T01:21:20Z",
      "cve": "CVE-2026-8286",
      "id": "CVE-2026-8286",
      "initial_release_date": "2026-07-10T03:20:32Z",
      "product_status:first_fixed": "13",
      "product_status:known_affected": "448",
      "product_status:known_not_affected": "13",
      "product_status:recommended": "135",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-8286",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-8286.json",
      "version": "10"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 8.1, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"NONE\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-8286\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-07-06T17:33:16.174641Z\"}}}], \"references\": [{\"url\": \"https://hackerone.com/reports/3718195\", \"tags\": [\"exploit\"]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-07-06T17:33:45.469Z\"}}], \"cna\": {\"title\": \"wrong STARTTLS connection reuse\", \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Andrew Nesbitt (powered by Mythos)\"}, {\"lang\": \"en\", \"type\": \"remediation developer\", \"value\": \"Stefan Eissing\"}], \"affected\": [{\"vendor\": \"curl\", \"product\": \"curl\", \"versions\": [{\"status\": \"affected\", \"version\": \"8.20.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.20.0\"}, {\"status\": \"affected\", \"version\": \"8.19.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.19.0\"}, {\"status\": \"affected\", \"version\": \"8.18.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.18.0\"}, {\"status\": \"affected\", \"version\": \"8.17.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.17.0\"}, {\"status\": \"affected\", \"version\": \"8.16.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.16.0\"}, {\"status\": \"affected\", \"version\": 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\"7.33.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.33.0\"}, {\"status\": \"affected\", \"version\": \"7.32.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.32.0\"}, {\"status\": \"affected\", \"version\": \"7.31.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.31.0\"}, {\"status\": \"affected\", \"version\": \"7.30.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.30.0\"}], \"defaultStatus\": \"unaffected\"}], \"references\": [{\"url\": \"https://curl.se/docs/CVE-2026-8286.json\", \"name\": \"json\"}, {\"url\": \"https://curl.se/docs/CVE-2026-8286.html\", \"name\": \"www\"}, {\"url\": \"https://hackerone.com/reports/3718195\", \"name\": \"issue\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"A vulnerability exists where a new transfer that uses STARTTLS to upgrade the\\nconnection might reuse an existing live connection even though the TLS\\nconfiguration mismatches so it should not.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"description\": \"CWE-295 Improper Certificate Validation\"}]}], \"providerMetadata\": {\"orgId\": \"2499f714-1537-4658-8207-48ae4bb9eae9\", \"shortName\": \"curl\", \"dateUpdated\": \"2026-07-03T06:14:17.541Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-8286\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-06T17:33:50.416Z\", \"dateReserved\": \"2026-05-11T07:06:37.906Z\", \"assignerOrgId\": \"2499f714-1537-4658-8207-48ae4bb9eae9\", \"datePublished\": \"2026-07-03T06:14:17.541Z\", \"assignerShortName\": \"curl\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Tags
Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.