CVE-2026-39829 (GCVE-0-2026-39829)

Vulnerability from cvelistv5 – Published: 2026-05-22 02:31 – Updated: 2026-07-10 12:05
VLAI
Title
Invoking pathological RSA/DSA parameters may cause DoS in golang.org/x/crypto/ssh
Summary
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.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-1176 - Inefficient CPU Computation
  • CWE-1284 - Improper Validation of Specified Quantity in Input
Assigner
Go
References
URL Tags
https://go.dev/issue/79565
https://groups.google.com/g/golang-announce/c/a08…
https://go.dev/cl/781641
https://go.dev/cl/781661
https://pkg.go.dev/vuln/GO-2026-5018
https://access.redhat.com/security/cve/CVE-2026-39829 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2480681 issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v… x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:36796 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36199 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:37072 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:35833 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:29455 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:37123 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36808 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26547 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36625 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36207 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26546 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36319 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36651 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36648 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36820 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:37387 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36797 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:37271 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:37268 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:37272 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:37278 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:37286 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:37296 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36883 vendor-advisoryx_refsource_REDHAT
Impacted products
Vendor Product Version
golang.org/x/crypto golang.org/x/crypto/ssh Affected: 0 , < 0.52.0 (semver)
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Red Hat RHEM 1.0 for RHEL 9     cpe:/a:redhat:edge_manager:1.0::el9
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Red Hat Red Hat Enterprise Linux AppStream (v. 10)     cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux AppStream (v. 8)     cpe:/a:redhat:enterprise_linux:8::appstream
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Red Hat Red Hat Enterprise Linux AppStream (v. 9)     cpe:/a:redhat:enterprise_linux:9::appstream
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Red Hat Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)     cpe:/o:redhat:enterprise_linux:10.2
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Red Hat DevWorkspace Operator 0.42     cpe:/a:redhat:devworkspace:0.42::el9
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Red Hat Red Hat Advanced Cluster Security for Kubernetes 4.10     cpe:/a:redhat:advanced_cluster_security:4.10::el8
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Red Hat Red Hat Advanced Cluster Security for Kubernetes 4.11     cpe:/a:redhat:advanced_cluster_security:4.11::el9
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Red Hat Red Hat Advanced Cluster Security for Kubernetes 4.9     cpe:/a:redhat:advanced_cluster_security:4.9::el8
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Red Hat Red Hat Edge Manager 1.0     cpe:/a:redhat:edge_manager:1.0::el9
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Red Hat Red Hat OpenShift Builds 1.7.4     cpe:/a:redhat:openshift_builds:1.7::el9
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Red Hat Red Hat OpenShift Dev Spaces 3.29     cpe:/a:redhat:openshift_devspaces:3.29::el9
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Red Hat Red Hat Openshift Data Foundation 4.22     cpe:/a:redhat:openshift_data_foundation:4.22::el9
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Red Hat Red Hat Trusted Artifact Signer 1.4     cpe:/a:redhat:trusted_artifact_signer:1.4::el9
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Red Hat multicluster engine for Kubernetes 2.9     cpe:/a:redhat:multicluster_engine:2.9::el9
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Red Hat Assisted Installer for Red Hat OpenShift Container Platform 2     cpe:/a:redhat:assisted_installer:2
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Red Hat cert-manager Operator for Red Hat OpenShift     cpe:/a:redhat:cert_manager:1
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Red Hat Confidential Compute Attestation     cpe:/a:redhat:confidential_compute_attestation:1
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Red Hat External Secrets Operator for Red Hat OpenShift     cpe:/a:redhat:external_secrets_operator:1
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Red Hat Multicluster Engine for Kubernetes     cpe:/a:redhat:multicluster_engine
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Red Hat OpenShift API for Data Protection     cpe:/a:redhat:openshift_api_data_protection:1
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Red Hat OpenShift Pipelines     cpe:/a:redhat:openshift_pipelines:1
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Red Hat OpenShift Serverless     cpe:/a:redhat:serverless:1
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Red Hat Red Hat Advanced Cluster Management for Kubernetes 2     cpe:/a:redhat:acm:2
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Red Hat Red Hat Advanced Cluster Security 4     cpe:/a:redhat:advanced_cluster_security:4
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Red Hat Red Hat Ceph Storage 9     cpe:/a:redhat:ceph_storage:9
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Red Hat Red Hat Edge Manager 1     cpe:/a:redhat:edge_manager:1
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Red Hat Red Hat Enterprise Linux 10     cpe:/o:redhat:enterprise_linux:10
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Red Hat Red Hat Enterprise Linux 9     cpe:/o:redhat:enterprise_linux:9
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Red Hat Red Hat OpenShift AI (RHOAI)     cpe:/a:redhat:openshift_ai
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Red Hat Red Hat OpenShift Container Platform 4     cpe:/a:redhat:openshift:4
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Red Hat Red Hat OpenShift for Windows Containers     cpe:/a:redhat:windows_machine_config
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Red Hat Red Hat OpenShift GitOps     cpe:/a:redhat:openshift_gitops:1
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Red Hat Red Hat OpenShift on AWS     cpe:/a:redhat:openshift_service_on_aws:1
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Red Hat Red Hat OpenShift Virtualization 4     cpe:/a:redhat:container_native_virtualization:4
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Red Hat Red Hat OpenStack Platform 16.2     cpe:/a:redhat:openstack:16.2
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Red Hat Red Hat OpenStack Platform 17.1     cpe:/a:redhat:openstack:17.1
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Red Hat Red Hat OpenStack Platform 18.0     cpe:/a:redhat:openstack:18.0
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Red Hat Red Hat Quay 3     cpe:/a:redhat:quay:3
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Red Hat Red Hat Trusted Artifact Signer     cpe:/a:redhat:trusted_artifact_signer:1
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Red Hat Security Profiles Operator     cpe:/a:redhat:openshift_security_profiles_operator:1
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Red Hat Zero Trust Workload Identity Manager     cpe:/a:redhat:zero_trust_workload_identity_manager:1
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Red Hat Zero Trust Workload Identity Manager - Tech Preview     cpe:/a:redhat:zero_trust_workload_identity_manager:0
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Red Hat Cryostat 4     cpe:/a:redhat:cryostat:4
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Red Hat Red Hat Openshift Data Foundation 4     cpe:/a:redhat:openshift_data_foundation:4
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Credits
NCC Group Cryptography Services, sponsored by Teleport
Show details on NVD website
To clipboard 

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            "cpes": [
              "cpe:/a:redhat:quay:3"
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            "vendor": "Red Hat"
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            "cpes": [
              "cpe:/a:redhat:openshift_security_profiles_operator:1"
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            "defaultStatus": "affected",
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          },
          {
            "cpes": [
              "cpe:/a:redhat:zero_trust_workload_identity_manager:1"
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            "defaultStatus": "affected",
            "product": "Zero Trust Workload Identity Manager",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:zero_trust_workload_identity_manager:0"
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            "defaultStatus": "affected",
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            "vendor": "Red Hat"
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            "cpes": [
              "cpe:/a:redhat:cryostat:4"
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        "datePublic": "2026-05-22T02:31:27.324Z",
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            "url": "https://access.redhat.com/errata/RHSA-2026:36796"
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            "lang": "en",
            "time": "2026-05-22T02:31:27.324Z",
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        ],
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        "workarounds": [
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            "lang": "en",
            "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."
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      "credits": [
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          "lang": "en",
          "value": "NCC Group Cryptography Services, sponsored by Teleport"
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      "problemTypes": [
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      "providerMetadata": {
        "dateUpdated": "2026-05-22T02:31:27.324Z",
        "orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
        "shortName": "Go"
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        {
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      "title": "Invoking  pathological RSA/DSA parameters may cause DoS in golang.org/x/crypto/ssh"
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    "dateReserved": "2026-04-07T18:13:03.528Z",
    "dateUpdated": "2026-07-10T12:05:35.912Z",
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      "title": "golang.org/x/crypto/ssh: golang.org/x/crypto/ssh: Denial of Service via crafted public key with excessive parameters",
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Successful exploitation could lead to a denial of service (DoS) due to prolonged CPU consumption during signature verification.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-1284\", \"description\": \"Improper Validation of Specified Quantity in Input\"}]}], \"providerMetadata\": {\"orgId\": \"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\", \"shortName\": \"redhat-SADP\", \"dateUpdated\": \"2026-07-10T12:05:35.912Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.5, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-39829\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-05-22T18:52:38.155082Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-05-22T18:53:29.195Z\"}}], \"cna\": {\"title\": \"Invoking  pathological RSA/DSA parameters may cause DoS in golang.org/x/crypto/ssh\", \"credits\": [{\"lang\": \"en\", \"value\": \"NCC Group Cryptography Services, sponsored by Teleport\"}], \"affected\": [{\"vendor\": \"golang.org/x/crypto\", \"product\": \"golang.org/x/crypto/ssh\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"0.52.0\", \"versionType\": \"semver\"}], \"packageName\": \"golang.org/x/crypto/ssh\", \"collectionURL\": \"https://pkg.go.dev\", \"defaultStatus\": \"unaffected\", \"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\"}]}], \"references\": [{\"url\": \"https://go.dev/issue/79565\"}, {\"url\": \"https://groups.google.com/g/golang-announce/c/a082jnz-LvI\"}, {\"url\": \"https://go.dev/cl/781641\"}, {\"url\": \"https://go.dev/cl/781661\"}, {\"url\": \"https://pkg.go.dev/vuln/GO-2026-5018\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"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.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"description\": \"CWE-1176: Inefficient CPU Computation\"}]}], \"providerMetadata\": {\"orgId\": \"1bb62c36-49e3-4200-9d77-64a1400537cc\", \"shortName\": \"Go\", \"dateUpdated\": \"2026-05-22T02:31:27.324Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-39829\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-10T12:05:35.912Z\", \"dateReserved\": \"2026-04-07T18:13:03.528Z\", \"assignerOrgId\": \"1bb62c36-49e3-4200-9d77-64a1400537cc\", \"datePublished\": \"2026-05-22T02:31:27.324Z\", \"assignerShortName\": \"Go\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.