What’s Vulnerable › Vulnerabilities
CVE-2026-55967: AES-GCM streaming APIs do not reject >64 GiB cumulative single messages, enabling counter wrap and keystream reuse
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-06-25 · updated 2026-10-24
- Weakness: CWE-323
Description
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.
Affected products
- wolfSSL: from 4.8.0 before 5.9.2 — fixed in 5.9.2
How to fix
Upgrade to a fixed version: wolfSSL 5.9.2. Check the vendor advisory for mitigations.
References
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