Vulnerability · Published Sep 6, 2026 · Assigned by curl
CVE-2026-82208wolfSSL CA-cache hit overrides callback
High 7.5
In plain English
A high-severity improper certificate validation in curl from curl. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 35% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.4%top 64.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.23 | curl | 8.22.0-r0 | ALPINE-CVE-2026-82208 |
| Alpine:v3.24 | curl | 8.22.0-r0 | ALPINE-CVE-2026-82208 |
| Debian:13 | curl | no fix listed | DEBIAN-CVE-2026-82208 |
| Debian:14 | curl | 8.22.0-1 | DEBIAN-CVE-2026-82208 |
| Ubuntu:22.04:LTS | curl | no fix listed | UBUNTU-CVE-2026-82208 |
| Ubuntu:24.04:LTS | curl | no fix listed | UBUNTU-CVE-2026-82208 |
| Ubuntu:26.04:LTS | curl | no fix listed | UBUNTU-CVE-2026-82208 |
Affected products (as reported)
Weakness: CWE-295 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N