CVE-2026-39829

HIGH 7.5

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

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

10th

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.

Vendor	golang.org/x/crypto
Product	golang.org/x/crypto/ssh
Published	May 22, 2026
Last Updated	May 22, 2026

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Affected Versions

golang.org/x/crypto / golang.org/x/crypto/ssh

0 < 0.52.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

go.dev: https://go.dev/issue/79565 groups.google.com: https://groups.google.com/g/golang-announce/c/a082jnz-LvI go.dev: https://go.dev/cl/781641 go.dev: https://go.dev/cl/781661 pkg.go.dev: https://pkg.go.dev/vuln/GO-2026-5018

Credits

NCC Group Cryptography Services, sponsored by Teleport