What is the CVSS score of CVE-2026-46597?

CVE-2026-46597 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.0%.

Which versions of golang.org/x/crypto/ssh are affected by CVE-2026-46597?

Go applications using the golang.org/x/crypto/ssh library (versions prior to 0.52.0) are vulnerable to denial-of-service attacks from remote, unauthenticated adversaries.. A patch is available.

Is there a public PoC exploit available for CVE-2026-46597?

Yes, a public proof-of-concept exploit is available for CVE-2026-46597. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-46597?

Within 24 hours: Inventory all internal Go applications and third-party services using golang.org/x/crypto/ssh; prioritize SSH servers exposed to untrusted networks. Within 7 days: Upgrade golang.org/x/crypto to version 0.52.0 or later and redeploy affected services. Within 30 days: Validate patch deployment across all systems and monitor for SSH connection anomalies or unexpected restart events.

golang.org/x/crypto/ssh CVE-2026-46597

EUVD-2026-31388 HIGH

Incorrect Type Conversion or Cast (CWE-704)

2026-05-22 Go

GHSA-q4h4-gmj2-qvw2

Information Disclosure Golang Org X Crypto Ssh Suse

7.5

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

7.5 HIGH

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

SUSE

HIGH

qualitative

Primary rating from NVD.

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

Analysis Generated

May 28, 2026 - 15:08 vuln.today

CVSS changed

May 28, 2026 - 15:07 NVD

7.5 (None) 7.5 (HIGH)

Patch available

May 22, 2026 - 04:31 EUVD

CVE Published

May 22, 2026 - 02:31 nvd

UNKNOWN (no severity yet)

DescriptionCVE.org

An incorrectly placed cast from bytes to int allowed for server-side panic in the AES-GCM packet decoder for well-crafted inputs.

AnalysisAI

Denial of service in the Go golang.org/x/crypto/ssh package (versions prior to 0.52.0) allows remote unauthenticated attackers to crash SSH server processes by sending crafted AES-GCM encrypted packets. An incorrectly placed bytes-to-int cast in the AES-GCM packet decoder triggers a server-side panic when processing well-crafted inputs. No public exploit identified at time of analysis, and EPSS exploitation probability is very low at 0.02%.

Technical ContextAI

The vulnerability resides in golang.org/x/crypto/ssh, the official Go SSH protocol implementation widely embedded in Go-based servers, bastions, CI/CD agents, and tooling (per CPE cpe:2.3:a:golang.org/x/crypto:golang.org/x/crypto/ssh). The root cause is classified as CWE-704 (Incorrect Type Conversion or Cast): an incorrectly placed cast from bytes to int within the AES-GCM packet decoder. When the decoder processes a malformed but well-formed-enough encrypted packet, the bad cast leads to a runtime panic, terminating the SSH server goroutine or process. AES-GCM is one of the default authenticated encryption modes negotiated during SSH transport setup, so the decoder is reached early in any SSH session.

RemediationAI

Upgrade the golang.org/x/crypto dependency to version 0.52.0 or later (Vendor-released patch: 0.52.0), then rebuild and redeploy any Go binary that embeds an SSH server - run 'go get golang.org/x/crypto@v0.52.0' followed by 'go mod tidy' and verify with 'govulncheck ./...' against GO-2026-5013. The fix landed in Go change https://go.dev/cl/781620 and was announced at https://groups.google.com/g/golang-announce/c/a082jnz-LvI. If immediate patching is not possible, compensating controls include restricting SSH server exposure to trusted source IPs via firewall/security-group ACLs and disabling AES-GCM ciphers in the server's negotiated cipher list (falling back to ChaCha20-Poly1305 or AES-CTR) - the trade-off is reduced interoperability with clients that only support GCM and a small performance penalty for ChaCha20-Poly1305 on platforms without AES-NI.