HOMEVULNERABILITIESCVE-2026-6091
MEDIUM

CVE-2026-6091

CWE-295Published: June 25, 2026· Updated: Jun 26, 2026

6.5
CVSS v3.1
EPSS:0.12%probability of exploitation in 30 daysPercentile:2.2th

Official Description

Partial-chain certificate verification may accept chains that terminate at a peer-supplied, untrusted intermediate certificate rather than a trusted anchor. An attacker could present a chain that ends at an intermediate they control and have it accepted as valid. This affects the OpenSSL compatibility certificate-path-building path (wolfSSL_X509_verify_cert / X509_STORE, OPENSSL_EXTRA) when the X509_V_FLAG_PARTIAL_CHAIN verify flag is enabled.

NVD Source

Technical Analysis

CVE-2026-6091 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in full integrity compromise (data manipulation), with a CVSS base score of 6.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Affected Vendors & Products

wolfssl1 product
wolfssl
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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Official Patches & Advisories

PATCHhttps://github.com/wolfSSL/wolfssl/pull/10170
ADVISORYhttps://www.wolfssl.com/docs/security-vulnerabilities/

All References (2)

→
https://github.com/wolfSSL/wolfssl/pull/10170Issue Tracking · Patch
→
https://www.wolfssl.com/docs/security-vulnerabilities/Vendor Advisory

Quick Facts

CVE IDCVE-2026-6091
CVSS Score6.5 / 10
SeverityMEDIUM
WeaknessCWE-295
CISA KEVNo
EPSS (30d)0.12%
Affected1 vendor
PublishedJun 25, 2026

Related CVEs (CWE-295)

CVE-2026-4370
10.0
CVE-2026-9258
9.8
CVE-2026-9259
9.8
CVE-2026-20184
9.8
CVE-2025-15573
9.4
CVE-2026-5194
9.3

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-6091 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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