Vulnerability in Golang Crypto

CVE-2026-39829

The RSA and DSA public key parsers did not enforce size limits on key parameters. A crafted public key with an excessively large modulus or DSA parameter could cause several minutes of CPU consumption during signature verification. This could be triggered by unauthenticated clients during public key authentication. RSA moduli are now limited to 8192 bits, and DSA parameters are validated per FIPS 186-2.

EPSS: 0.005 (38.7th 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:N/I:N/A:H.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-39829?
CVE-2026-39829 is a high-severity vulnerability in Golang Crypto, classified under Improper Verification of Cryptographic Signature. CVSS score: 7.5/10. Published 2026-05-22.
How severe is CVE-2026-39829?
High severity. CVSS v3 base score is 7.5 out of 10.