CVE-2026-39829

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

CVSS 7.5 HIGHEPSS 0.3%

Vexday Risk Score

21Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 7.5EPSS 0.3%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

22 May 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

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

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References

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