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CVE-2026-8286— wrong STARTTLS connection reuse

Quick assessment

Affected
curl curl
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

curl是瑞典cURL团队开源的一款用于从服务器传输数据或向服务器传输数据的工具。 curl存在加密问题漏洞，该漏洞源于使用STARTTLS升级连接时，可能重用不匹配TLS配置的现有活动连接，导致证书验证不当。

AI Predicted 5.9 Difficulty: Moderate EPSS 0.31% · P22

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 117

VendorProduct Version RangeStatus
curl curl 7.30.0< 8.14.2 affected
8.15.0< 8.16.1 affected
8.17.0< 8.20.1 affected
a1701eea289fe7ea80651f801cf992838a491dde< a86efdd7ca5433de9231e650f18247de8319ad16 affected
8.20.0 affected
8.19.0 affected
8.18.0 affected
8.17.0 affected
… +109 more rows
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I. Basic Information for CVE-2026-8286

Vulnerability Information
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Vulnerability Title
wrong STARTTLS connection reuse
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
证书验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
curl 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
curl是瑞典cURL团队开源的一款用于从服务器传输数据或向服务器传输数据的工具。 curl存在加密问题漏洞，该漏洞源于使用STARTTLS升级连接时，可能重用不匹配TLS配置的现有活动连接，导致证书验证不当。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
curl curl 7.30.0 ~ 8.14.2 -
curl curl a1701eea289fe7ea80651f801cf992838a491dde ~ a86efdd7ca5433de9231e650f18247de8319ad16 -
curl curl 8.20.0 -

II. Public POCs for CVE-2026-8286

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III. Intelligence Information for CVE-2026-8286

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Vendor Advisories for CVE-2026-8286 (2)

Other References for CVE-2026-8286 (1)

Same Patch Batch · curl · 2026-07-03 · 18 CVEs total

CVE-2026-9546 sending old referer
CVE-2026-8932 incomplete mTLS config matching in conn reuse
CVE-2026-8458 wrong reuse for different services
CVE-2026-8925 SASL double-free
CVE-2026-8927 env-set cross-proxy Digest auth state leak
CVE-2026-8926 password leak with netrc and user in URL
CVE-2026-8924 trailing dot domain super cookie
CVE-2026-12064 proto-default skips SSH verification
CVE-2026-10536 HTTP/2 stream-dependency tree UAF
CVE-2026-11352 QUIC zero-length UDP datagrams busy-loop
CVE-2026-9545 exposing HTTP/3 early data
CVE-2026-9080 UAF after pause in socket callback
CVE-2026-9547 SSH improper host validation
CVE-2026-9079 stale proxy password leak
CVE-2026-11564 Native CA trust persist
CVE-2026-11856 cross-origin Digest auth state leak
CVE-2026-11586 WS Auto-PONG memory exhaustion

IV. Related Vulnerabilities

Same product: curl
Same vendor: curl
Same weakness: CWE-295

V. Comments for CVE-2026-8286

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