Cyber Resilience

CVE-2026-6678

Low

Published: 25 June 2026

Published
25 June 2026
Modified
01 July 2026
KEV Added
—
Patch
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CVSS Score v4 1.0 CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Clear
EPSS Score 0.0019 8.8th percentile
Risk Priority 15 floored blend · peak EPSS

Summary

CVE-2026-6678 is a low-severity Wrap or Wraparound (CWE-191) vulnerability in Wolfssl Wolfssl. Its CVSS base score is 1.0 (Low).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 8.8th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

Integer underflow in wc_PKCS7_DecryptOri when handling crafted Other Recipient Info, leading to incorrect length handling during decryption.

CWE(s)
CWE-191

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
Why these techniques?

Integer underflow in PKCS7 decryption handling enables remote exploitation of applications using the affected library via crafted inputs.

Confidence: MEDIUM · MITRE ATT&CK Enterprise v19.0

CVEs Like This One

CVE-2026-6679Same product: Wolfssl Wolfssl
CVE-2026-11703Same product: Wolfssl Wolfssl
CVE-2025-11931Same product: Wolfssl Wolfssl
CVE-2026-5187Same product: Wolfssl Wolfssl
CVE-2026-4395Same product: Wolfssl Wolfssl
CVE-2026-5194Same product: Wolfssl Wolfssl
CVE-2026-5501Same product: Wolfssl Wolfssl
CVE-2026-55960Same product: Wolfssl Wolfssl
CVE-2026-3549Same product: Wolfssl Wolfssl
CVE-2026-10097Same product: Wolfssl Wolfssl

Affected Assets

wolfssl
wolfssl
3.15.5 — 5.9.2

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References