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No exploitation reportedFix available

CVE-2026-39830

No exploitation reported by the sources we read.

  • Published2026-05-22
  • Fixed in0.52.0
  • WeaknessCWE-119 · CWE-772

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

A malicious SSH peer could send unsolicited global request responses to fill an internal buffer, blocking the connection's read loop. The blocked goroutine could not be released by calling Close(), resulting in a resource leak per connection. Unsolicited global responses are now discarded.

Timeline

dates in UTC
  1. 2026-05-2204:16CVE publishedNVD

Versions per branch

NVD · OSV
Golang crypto
BranchAffectedFixed in
0.52< 0.52.00.52.0

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As Go, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • golang.org/x/crypto/sshother versions: not affected

    https://pkg.go.dev

    Affected
    • < 0.52.0fixed in 0.52.0semver

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-05-22

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • aardvark-dnsRocky Linux:8all versions · fixed in 2:1.10.1-2.module+el8.10.0+1874+ce489889
  • aardvark-dnsRocky Linux:8all versions · fixed in 2:1.10.1-2.module+el8.10.0+1880+8e896d1b
  • aardvark-dnsRocky Linux:8all versions · fixed in 2:1.10.1-2.module+el8.10.0+1896+b18fa106
  • aardvark-dnsRocky Linux:8all versions · fixed in 2:1.10.1-2.module+el8.10.0+1948+4b5cd4a9
  • aardvark-dnsRocky Linux:8all versions · fixed in 2:1.10.1-2.module+el8.10.0+2001+6a33db9f
  • aardvark-dnsRocky Linux:8all versions · fixed in 2:1.10.1-2.module+el8.10.0+40047+0c0a73f4
  • aardvark-dnsRocky Linux:8all versions · fixed in 2:1.10.1-2.module+el8.10.0+40133+32c21f88
  • aardvark-dnsAlmaLinux:8all versions · fixed in 2:1.10.1-2.module_el8.10.0+3901+4b80ecd7

766 more package ranges on OSV.dev

Vendor advisories

  • CVE-2026-39830 Red Hat Product Security1,174 products fixed · 110 known affected

    golang.org/x/crypto/ssh: golang.org/x/crypto/ssh: Denial of Service via resource leak from unsolicited SSH responses

    assisted/agent-preinstall-image-builder-rhel9 as a component of Assisted Installer for Red Hat OpenShift Container Platform 2 · openshift-sandboxed-containers/osc-cloud-api-adaptor-rhel9 as a component of Confidential Compute Attestation · openshift-sandboxed-containers/osc-podvm-payload-rhel9 as a component of Confidential Compute Attestation · +107 more

  • RHSA-2026:90274 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: OpenShift Container Platform 4.12.102 bug fix and security update

  • RHSA-2026:82785 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: OpenShift Container Platform 4.14.76 bug fix and security update

  • RHSA-2026:82813 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: OpenShift Container Platform 4.15.70 bug fix and security update

  • RHSA-2026:79039 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: OpenShift Container Platform 4.18.57 bug fix and security update

  • RHSA-2026:77552 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: OpenShift Container Platform 4.17.59 bug fix and security update

73 more advisories

Full record on NVD

Fix

  1. Update Golang crypto to 0.52.0
  2. Vendor fix Red Hat Product Security RHSA-2026:90274 · 1 productFor OpenShift Container Platform 4.12 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.redhat.com/en/documentation/openshift_container_platform/4.…
  3. Vendor fix Red Hat Product Security RHSA-2026:82785 · 4 productsFor OpenShift Container Platform 4.14 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.redhat.com/en/documentation/openshift_container_platform/4.…
  4. Vendor fix Red Hat Product Security RHSA-2026:82813 · 4 productsFor OpenShift Container Platform 4.15 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.redhat.com/en/documentation/openshift_container_platform/4.…
  5. Vendor fix Red Hat Product Security RHSA-2026:79039 · 4 productsFor OpenShift Container Platform 4.18 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.redhat.com/en/documentation/openshift_container_platform/4.…
  6. Vendor fix Red Hat Product Security RHSA-2026:77552 · 4 productsFor OpenShift Container Platform 4.17 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.redhat.com/en/documentation/openshift_container_platform/4.…
  7. Vendor fix Red Hat Product Security RHSA-2026:82322 · 4 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. The steps to apply the upgraded images are different depending on the installation plan approval policy you used when installing the cert-manager Operator for Red Hat OpenShift. - If t…

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2026-05-22
Last Modified
2026-09-16
NVD status
Modified
MSRC Title
Invoking client can cause server deadlock on unexpected responses in golang.org/x/crypto/ssh
GitHub Advisory
GHSA-vgwf-h737-ff37

Frequently asked questions

What is CVE-2026-39830?

A malicious SSH peer could send unsolicited global request responses to fill an internal buffer, blocking the connection's read loop. The blocked goroutine could not be released by calling Close(), resulting in a resource leak per connection. Unsolicited global responses are now discarded.

Is CVE-2026-39830 actively exploited?

Active exploitation of CVE-2026-39830 has not been confirmed. Its EPSS score was 0.7% on 2026-11-09, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-39830?

CVE-2026-39830 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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