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

Vulnerability from cvelistv5 – Published: 2026-05-22 02:31 – Updated: 2026-07-03 12:04
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
CWE
  • CWE-1176 - Inefficient CPU Computation
Assigner
Go
References
Impacted products
Vendor Product Version
golang.org/x/crypto golang.org/x/crypto/ssh Affected: 0 , < 0.52.0 (semver)
Create a notification for this product.
Credits
NCC Group Cryptography Services, sponsored by Teleport
Show details on NVD website
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[\"cpe:/a:redhat:openshift_gitops:1\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat OpenShift GitOps\", \"defaultStatus\": \"affected\"}, {\"cpes\": [\"cpe:/a:redhat:openshift_service_on_aws:1\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat OpenShift on AWS\", \"defaultStatus\": \"affected\"}, {\"cpes\": [\"cpe:/a:redhat:container_native_virtualization:4\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat OpenShift Virtualization 4\", \"defaultStatus\": \"affected\"}, {\"cpes\": [\"cpe:/a:redhat:openstack:16.2\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat OpenStack Platform 16.2\", \"defaultStatus\": \"affected\"}, {\"cpes\": [\"cpe:/a:redhat:openstack:17.1\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat OpenStack Platform 17.1\", \"defaultStatus\": \"affected\"}, {\"cpes\": [\"cpe:/a:redhat:openstack:18.0\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat OpenStack Platform 18.0\", \"defaultStatus\": \"affected\"}, {\"cpes\": [\"cpe:/a:redhat:quay:3\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Quay 3\", \"defaultStatus\": \"affected\"}, {\"cpes\": [\"cpe:/a:redhat:trusted_artifact_signer:1\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Trusted Artifact Signer\", \"defaultStatus\": \"affected\"}, {\"cpes\": [\"cpe:/a:redhat:openshift_security_profiles_operator:1\"], \"vendor\": \"Red Hat\", \"product\": \"Security Profiles Operator\", \"defaultStatus\": \"affected\"}, {\"cpes\": [\"cpe:/a:redhat:zero_trust_workload_identity_manager:1\"], \"vendor\": \"Red Hat\", \"product\": \"Zero Trust Workload Identity Manager\", \"defaultStatus\": \"affected\"}, {\"cpes\": [\"cpe:/a:redhat:zero_trust_workload_identity_manager:0\"], \"vendor\": \"Red Hat\", \"product\": \"Zero Trust Workload Identity Manager - Tech Preview\", \"defaultStatus\": \"affected\"}, {\"cpes\": [\"cpe:/a:redhat:openshift_data_foundation:4\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Openshift Data Foundation 4\", \"defaultStatus\": \"unaffected\"}], \"timeline\": [{\"lang\": \"en\", \"time\": \"2026-05-22T04:01:30.092Z\", \"value\": \"Reported to Red Hat.\"}, {\"lang\": \"en\", \"time\": \"2026-05-22T02:31:27.324Z\", \"value\": \"Made public.\"}], \"solutions\": [{\"lang\": \"en\", \"value\": \"RHSA-2026:29455: Red Hat Enterprise Linux AppStream (v. 9)\"}, {\"lang\": \"en\", \"value\": \"RHSA-2026:26547: Red Hat Advanced Cluster Security for Kubernetes 4.10\"}, {\"lang\": \"en\", \"value\": \"RHSA-2026:26546: Red Hat Advanced Cluster Security for Kubernetes 4.9\"}], \"x_adpType\": \"supplier\", \"datePublic\": \"2026-05-22T02:31:27.324Z\", \"references\": [{\"url\": \"https://access.redhat.com/security/cve/CVE-2026-39829\", \"tags\": [\"vdb-entry\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://bugzilla.redhat.com/show_bug.cgi?id=2480681\", \"name\": \"RHBZ#2480681\", \"tags\": [\"issue-tracking\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-39829.json\", \"tags\": [\"x_sadp-csaf-vex\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:29455\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:26547\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:26546\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}], \"workarounds\": [{\"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.\"}], \"x_generator\": {\"engine\": \"sadp-cli 1.0.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"A flaw was found in golang.org/x/crypto/ssh. The RSA and DSA public key parsers in the affected component did not enforce size limits on key parameters. This vulnerability allows an unauthenticated client to provide a crafted public key with an excessively large modulus or DSA parameter during public key authentication. 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\": \"2026-07-03T12:04:53.309Z\"}}, {\"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\": \"2026-07-03T12:04:53.309Z\", \"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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Taxonomy of the tags.




Sightings

Author Source Type Date

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.