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

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.

Published May 22, 2026Updated Sep 18, 2026Sources: cvelistV5, Go

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the scoring sources call it.

Exploitation

Unreported

no source claims exploitation

EPSS

chance of exploitation in 30 days

Affects

golang org x crypto

76 products listed

CVSS base

7.5

HIGH

CISA SSVC assessment

Three decision points CISA publishes for the CVEs it assesses · SSVC 2.0.3. A stakeholder decision, not a severity score.

CISA

Exploitation

None

none · proof-of-concept · active

Automatable

Yes

can an attacker script all four kill-chain steps

Technical impact

Partial

partial · total control of the vulnerable component

Affected scope

The catalog records vendors and products as separate lists, not pairs, so which product belongs to which vendor is not something this page can say.

Vendors (2)

golang org x crypto redhat

Products (76)

golang org x crypto sshcryostat 4 on rhel 9red hat enterprise linux 10red hat enterprise linux 8red hat enterprise linux 8 8 telecommunications update servicered hat enterprise linux 8 8 update services for sap solutionsred hat enterprise linux 9red hat enterprise linux 9 6 extended update supportrhem 1 0 for rhel 9rhem 1 1 for rhel 10rhem 1 1 for rhel 9cluster observability operator 1 5 0devworkspace operator 0 42multicluster engine for kubernetes 2 1multicluster engine for kubernetes 2 11multicluster engine for kubernetes 2 17multicluster engine for kubernetes 2 6multicluster engine for kubernetes 2 8multicluster engine for kubernetes 2 9openshift api for data protection 1 3openshift api for data protection 1 4openshift api for data protection 1 5openshift api for data protection 1 6red hat advanced cluster management for kubernetes 2 15red hat advanced cluster management for kubernetes 2 16red hat advanced cluster security 4 9red hat advanced cluster security for kubernetes 4 10red hat advanced cluster security for kubernetes 4 11red hat edge manager 1 0red hat edge manager 1 1red hat openshift ai 2 25red hat openshift ai 3 4red hat openshift builds 1 7 3red hat openshift builds 1 8 1red hat openshift container platform 4 19red hat openshift container platform 4 20red hat openshift container platform 4 21red hat openshift container platform 4 22red hat openshift data foundation 4 22red hat openshift dev spaces 3 29red hat openshift gitops 1 19red hat openshift gitops 1 20red hat openstack platform 16 2red hat quay 3 10red hat quay 3 12red hat quay 3 15red hat quay 3 16red hat quay 3 9red hat trusted artifact signer 1 3red hat trusted artifact signer 1 4assisted installer for red hat openshift container platform 2cert manager operator for red hat openshiftconfidential compute attestationexternaldns operatorexternal secrets operator for red hat openshiftlogging subsystem for red hat openshiftmulticluster engine for kubernetesopenshift api for data protectionopenshift pipelinesopenshift serverlessred hat advanced cluster management for kubernetes 2red hat advanced cluster security 4red hat openshift ai rhoaired hat openshift container platform 4red hat openshift data foundation 4red hat openshift for windows containersred hat openshift gitopsred hat openshift on awsred hat openshift virtualization 4red hat openstack platform 17 1red hat openstack platform 18 0red hat quay 3red hat trusted artifact signersecurity profiles operatorzero trust workload identity managerzero trust workload identity manager tech preview

Every base score collected

Sources score independently and disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Source
7.5	CVSS 3.1	HIGH	—	—	cvelistV5

Weakness & attack patterns

CWE-1284

References

25 on the record

go.dev/issue/79565
reference
groups.google.com/g/golang-announce/c/a082jnz-LvI
reference
go.dev/cl/781641
reference
go.dev/cl/781661
reference
pkg.go.dev/vuln/GO-2026-5018
reference
access.redhat.com/security/cve/CVE-2026-39829
vdb-entry, x_refsource_REDHAT
bugzilla.redhat.com/show_bug.cgi?id=2480681
issue-tracking, x_refsource_REDHAT
security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-39829.json
x_sadp-csaf-vex

Elsewhere on this site

golang org x cryptoevery CVE for this vendor
redhatevery CVE for this vendor
CWE-1284other pages naming this weakness

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.