CVE-2026-39829

HIGH

Invoking pathological RSA/DSA parameters may cause DoS in golang.org/x/crypto/ssh

Title source: cna
STIX 2.1

Description

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.

References (53)

Core 53
Core References

Scores

CVSS v3 7.5
EPSS 0.0047
EPSS Percentile 38.0%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-1284 CWE-347
Status published
Products (3)
golang/crypto < 0.52.0
golang.org/x/crypto/golang.org/x/crypto/ssh < 0.52.0
x/crypto 0 - 0.52.0Go
Published May 22, 2026
Tracked Since May 22, 2026