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

What is CVE-2026-82208?

CVE-2026-82208 is a high-severity vulnerability in Haxx Curl, published on 6 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-295

Which versions are affected by CVE-2026-82208?

It affects 1 product.

Products include Haxx Curl.

How do I fix CVE-2026-82208?

Apply the vendor's patch.

Is CVE-2026-82208 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-82208 exists.

Other vulnerabilities in Haxx Curl

• CVE-2026-19931 Negotiate ambient user conn reuse Critical 9.8
• CVE-2026-10536 HTTP/2 stream-dependency tree UAF Critical 9.8
• CVE-2026-11856 cross-origin Digest auth state leak Critical 9.8
• CVE-2026-8925 SASL double-free Critical 9.8
• CVE-2026-9079 stale proxy password leak Critical 9.8

All Haxx Curl vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as ALPINE-CVE-2026-82208, AZL-99756, AZL-99798, AZL-99840, AZL-99849, BELL-CVE-2026-82208 and 9 more.