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libcurl EUVDEUVD-2026-72152

| CVE-2026-82208 HIGH
Improper Certificate Validation (CWE-295)
7.5
CVSS 3.1 · Vendor
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Severity by source

Vendor (CNA) PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
vuln.today AI
7.4 HIGH

MITM network position plus three simultaneous non-default configuration prerequisites raise AC to H; MITM capability enables both read and inject, so I:H applies.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
4.0 AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
SUSE
3.1 MEDIUM
AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N

Primary rating from Vendor (CNA).

CVSS VectorVendor

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

Lifecycle Timeline

5
Analysis Updated
Sep 08, 2026 - 19:37 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Sep 08, 2026 - 19:23 vuln.today
cvss_changed
CVSS changed
Sep 08, 2026 - 19:23 NVD
7.5 (HIGH)
Analysis Generated
Sep 02, 2026 - 12:18 vuln.today
CVE Published
Sep 02, 2026 - 10:57 oss-security
CRITICAL

Description PRE-NVD

Disclosed via oss-security. NVD scoring and full description are pending.

AnalysisAI

Certificate validation bypass in libcurl (curl 8.9.1 through 8.21.0) with the wolfSSL TLS backend allows a network-positioned attacker to intercept encrypted communications by exploiting a post-callback CA store reinstatement bug. When an application uses CURLOPT_SSL_CTX_FUNCTION to install a custom trust store at connection time, libcurl silently overwrites that callback-selected store with the previously cached CA bundle, causing certificates that the callback explicitly rejected to be accepted without error. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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Delivery
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Vulnerability AssessmentAI

Exploitation Three conditions must hold simultaneously: (1) curl/libcurl must be compiled and running with the wolfSSL TLS backend - not the default on most Linux distributions or macOS, which ship OpenSSL or GnuTLS builds; (2) CA caching must be enabled within the wolfSSL integration layer; (3) the application must register a CURLOPT_SSL_CTX_FUNCTION callback and use it to replace the SSL context's trust store with a custom bundle. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The vendor-assigned CVSS 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N) overstates attacker convenience: AV:N and AC:L imply broad unauthenticated network exploitability, but exploitation actually requires three non-default concurrent conditions - wolfSSL as the TLS backend, CA caching enabled, and active use of CURLOPT_SSL_CTX_FUNCTION - none of which represent a default curl deployment. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade curl/libcurl to the patched release documented at https://curl.se/docs/vuln-8.21.0.html; the curl project's security advisory at https://curl.se/docs/CVE-2026-82208.html provides authoritative fix guidance. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours, identify whether your organization uses libcurl with wolfSSL backend and CURLOPT_SSL_CTX_FUNCTION custom CA store callbacks; document findings and escalation path for any identified systems. …

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SLES15-SP5-CHOST-BYOS-SAP-CCloud Not-Affected
SLES15-SP6-CHOST-BYOS Not-Affected
SLES15-SP6-CHOST-BYOS-Aliyun Not-Affected
SLES15-SP6-CHOST-BYOS-Azure Not-Affected
SLES15-SP6-CHOST-BYOS-EC2 Not-Affected

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EUVD-2026-72152 vulnerability details – vuln.today

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