High 7.5Published May 21, 2026

CVE-2026-39829Invoking pathological RSA/DSA parameters may cause DoS in golang.org/x/crypto/ssh

Updated under an hour ago (Oct 27, 2026, 9:23 AM ET)

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It affects golang.org/x/crypto/ssh and 35 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for golang.org/x/crypto/ssh

Exploited in the last 30 days

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: 7.5 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-1176, CWE-1284
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Go
NVD analysis: Modified
Record last updated: Sep 18, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

golang.org/x/crypto golang.org/x/crypto/ssh golang.org_x_crypto:ssh (from the name)	before 0.52.0	CNA record
Red Hat Cryostat 4 on RHEL 9 redhat:cryostat	from 4.2.0-19 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux	from 2:1.43.1-3.el10_2 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service redhat:rhel_tus	from 8080020260721142025.63b34585 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions redhat:rhel_e4s	from 8080020260721142025.63b34585 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support redhat:rhel_eus	from 5:5.4.0-22.el9_6.5 not affected	CISA ADP
Red Hat RHEM 1.0 for RHEL 9 redhat:edge_manager	from 0:1.0.3-1.el9em not affected	CISA ADP
Red Hat Cluster Observability Operator 1.5.0 redhat:cluster_observability_operator	from 1787593637 not affected	CISA ADP
Red Hat DevWorkspace Operator 0.42 redhat:devworkspace	from 1782400868 not affected	CISA ADP
Red Hat multicluster engine for Kubernetes 2.1 redhat:multicluster_engine	from 1784646026 not affected	CISA ADP
1–10 of 36

References

References

https://go.dev/issue/79565	issue-tracking
https://groups.google.com/g/golang-announce/c/a082jnz-LvI	mailing-list
https://go.dev/cl/781641	issue-tracking
https://go.dev/cl/781661	issue-tracking
https://pkg.go.dev/vuln/GO-2026-5018	vendor-advisory
https://access.redhat.com/errata/RHSA-2026:26546
https://access.redhat.com/errata/RHSA-2026:26547
https://access.redhat.com/errata/RHSA-2026:29455
https://access.redhat.com/errata/RHSA-2026:35833
https://access.redhat.com/errata/RHSA-2026:36199
1–10 of 25

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.