What is CVE-2026-55967?

CVE-2026-55967 is a high-severity vulnerability in Wolfssl, classified under Reusing a Nonce, Key Pair in Encryption. CVSS score: 7.5/10. Published 2026-06-25.

How severe is CVE-2026-55967?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Wolfssl

CVE-2026-55967

AES-GCM encryption/decryption with extremely large cumulative single message sizes (>64 GiB) were not properly rejected by the streaming APIs, allowing counter wrap, keystream reuse, and consequent plaintext recovery.

EPSS: 0.001 (1.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Wolfssl — versions 4.8.0

Weakness classification (CWE)

CWE-323 — Reusing a Nonce, Key Pair in Encryption

References

facts@wolfssl.com (Patch, patch, Issue Tracking)
facts@wolfssl.com (Vendor Advisory)

Frequently asked questions

What is CVE-2026-55967?: CVE-2026-55967 is a high-severity vulnerability in Wolfssl, classified under Reusing a Nonce, Key Pair in Encryption. CVSS score: 7.5/10. Published 2026-06-25.
How severe is CVE-2026-55967?: High severity. CVSS v3 base score is 7.5 out of 10.