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

cve-program · severity unknownCVSS unknownCheck source for fixed versionsKEV status unknown

Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.

cve-program · CVE-2026-39829

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-39829

Published

golang.org/x/crypto/ssh

https://pkg.go.dev

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "golang.org/x/crypto",
                    "product": "golang.org/x/crypto/ssh",
                    "collectionURL": "https://pkg.go.dev",
                    "packageName": "golang.org/x/crypto/ssh",
                    "versions": [
                        {
                            "version": "0",
                            "lessThan": "0.52.0",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ],
                    "programRoutines": [
                        {
                            "name": "parseRSA"
                        },
                        {
                            "name": "checkDSAParams"
                        },
                        {
                            "name": "parseDSA"
                        },
                        {
                            "name": "Dial"
                        },
                        {
                            "name": "NewClientConn"
                        },
                        {
                            "name": "NewServerConn"
                        },
                        {
                            "name": "NewSignerFromKey"
                        },
                        {
                            "name": "ParseAuthorizedKey"
                        },
                        {
                            "name": "ParseKnownHosts"
                        },
                        {
                            "name": "ParsePrivateKey"
                        },
                        {
                            "name": "ParsePrivateKeyWithPassphrase"
                        },
                        {
                            "name": "ParsePublicKey"
                        },
                        {
                            "name": "ParseRawPrivateKey"
                        },
                        {
                            "name": "ParseRawPrivateKeyWithPassphrase"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }

Original source record · Cite this exact observation · Complete original publisher JSON

ChangeIntel

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Sources read 15 Nov 22:09 UTC · 274 of 275 readable · 268 fully read · documentation 469/469 current