Review reviewHigh

CVE-2026-39829

golang.org/x/crypto golang.org/x/crypto/ssh, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8

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.

CVSS: 7.5
EPSS: 0.47%
CISA KEV: Not listed
Published: 2026.05.22

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability0.47%

Technical severityCVSS 7.5

Vulnerability overview

Affected product and versions

Product: golang.org/x/crypto golang.org/x/crypto/ssh, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8
Affected versions: < 0.52.0
Fixed versions: 0.52.0

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that golang.org/x/crypto golang.org/x/crypto/ssh, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8 and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE: CWE-1284, CWE-347