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CVE-2026-82208— wolfSSL CA-cache hit overrides callback

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 8.21.0及之前版本存在加密问题漏洞，该漏洞源于使用wolfSSL后端时，在启用CA缓存且CURLOPT_SSL_CTX_FUNCTION回调替换信任存储后，libcurl会在回调返回后静默重新安装缓存存储，导致被缓存存储信任但被回调所选存储拒绝的证书被错误接受。

AI Predicted 6.8 Difficulty: Moderate EPSS 0.43% · P36

Affected Version Matrix 22

VendorProduct Version RangeStatus
curl curl 8.9.1< 8.14.2 affected
8.15.0< 8.16.1 affected
8.17.0< 8.20.1 affected
8.21.0< 8.22.0 affected
0f2876b2c33f6784a27b6f7345bd8cd95b46352a< ed0338befd1d865a8ea1fbaa90013a096dedd07a affected
8.21.0 affected
8.20.0 affected
8.19.0 affected
… +14 more rows
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I. Basic Information for CVE-2026-82208

Vulnerability Information
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Vulnerability Title
wolfSSL CA-cache hit overrides callback
Source: CVE Program / CVE List V5
Vulnerability Description
With the wolfSSL backend, when CA caching is enabled and an `CURLOPT_SSL_CTX_FUNCTION` callback replaces the trust store, libcurl can silently reinstall the cached store after the callback returns. A certificate trusted by the cached store but rejected by the callback-selected store is then incorrectly accepted.
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 8.21.0及之前版本存在加密问题漏洞，该漏洞源于使用wolfSSL后端时，在启用CA缓存且CURLOPT_SSL_CTX_FUNCTION回调替换信任存储后，libcurl会在回调返回后静默重新安装缓存存储，导致被缓存存储信任但被回调所选存储拒绝的证书被错误接受。
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 8.9.1 ~ 8.14.2 -
curl curl 0f2876b2c33f6784a27b6f7345bd8cd95b46352a ~ ed0338befd1d865a8ea1fbaa90013a096dedd07a -
curl curl 8.21.0 -

II. Public POCs for CVE-2026-82208

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III. Intelligence Information for CVE-2026-82208

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Vendor Advisories for CVE-2026-82208 (2)

Vendor Pages for CVE-2026-82208 (1)

Same Patch Batch · curl · 2026-09-06 · 9 CVEs total

CVE-2026-82209 domain-scoped PSL domain cookie
CVE-2026-18924 HTTP/2 server push UAF
CVE-2026-19931 Negotiate ambient user conn reuse
CVE-2026-80231 native CA store conn reuse
CVE-2026-80229 OpenSSL provider use-after-free
CVE-2026-80230 OpenSSL pinning bypass
CVE-2026-80255 secure cookie attribute bypass with tab
CVE-2026-13608 OpenLDAP SASL authentication bypass

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-82208

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