Medium severity · published Jun 25, 2026
CVE-2026-6678
Integer underflow in wc_PKCS7_DecryptOri handling crafted Other Recipient Info
5.3
CVSS
0.3%
EPSS
No
On KEV
Description
Integer underflow in wc_PKCS7_DecryptOri when handling crafted Other Recipient Info, leading to incorrect length handling during decryption.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 26% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WO
wolfSSL · wolfSSL
3.15.5 through 5.9.1 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-6678
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-6678
Issue Tracking
https://github.com/wolfSSL/wolfssl/pull/10203
Vendor Advisory
https://www.wolfssl.com/docs/security-vulnerabilities/
www.talosintelligence.com
https://www.talosintelligence.com/vulnerability_reports/TALOS-2026-2408
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