CVE-2026-82208

wolfSSL CA-cache hit overrides callback

HIGH
7.5
CVSS Score
Published: September 6, 2026 at 05:49 PM UTC
Updated: September 15, 2026 at 07:35 AM UTC
1 product affected across 1 vendorCurl

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Severity
HIGH7.5
Exploit prediction
EPSS 0.4%
SSVC
PoC

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

8.15.0 ≤ v < 8.16.18.17.0 ≤ v < 8.20.18.21.0 ≤ v < 8.22.08.9.1 ≤ v < 8.14.28.9.1 ≤ v < 8.22.00f2876b2c33f6784a27b6f7345bd8cd95b46352a8.10.08.10.18.11.08.11.18.12.08.12.18.13.08.14.08.14.18.15.08.16.08.17.08.18.08.19.08.20.08.21.08.9.1
Vendor states this is fixed in ed0338befd1d865a8ea1fbaa90013a096dedd07a (fixed)
Affected range stops below 8.14.2, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.16.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.20.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.22.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (3)

Vendor Advisory
Source: cverecord
https://curl.se/docs/CVE-2026-82208.json
PatchVendor Advisory
Source: cverecord
https://curl.se/docs/CVE-2026-82208.html
ExploitMitigationThird Party Advisory
Source: cverecord
https://hackerone.com/reports/3973090

SSVC — Action Prioritization

SSVCPoCAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-295

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