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No exploitation reportedFix available

CVE-2026-39832

No exploitation reported by the sources we read.

  • Published2026-05-22
  • Fixed in0.52.0
  • WeaknessCWE-281 · CWE-502

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

When adding a key to a remote agent constraint extensions such as restrict-destination-v00@openssh.com were not serialized in the request. Destination restrictions were silently stripped when forwarding keys, allowing unrestricted use of the key on the remote host. The client now serializes all constraint extensions. Additionally, the in-memory keyring returned by NewKeyring() now rejects keys with unsupported constraint extensions instead of silently ignoring them.

Timeline

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

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-39832?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-39832?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

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.

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-dnsAlmaLinux:8all versions · fixed in 2:1.10.1-2.module_el8.10.0+3901+4b80ecd7
  • aardvark-dnsAlmaLinux:8all versions · fixed in 2:1.10.1-2.module_el8.10.0+3909+6e1c1eb7
  • aardvark-dnsAlmaLinux:8all versions · fixed in 2:1.10.1-2.module_el8.10.0+4047+545787c4
  • aardvark-dnsAlmaLinux:8all versions · fixed in 2:1.10.1-2.module_el8.10.0+4089+ce72bbbe
  • buildahAlmaLinux:10all versions · fixed in 2:1.43.1-3.el10_2and 1 other package
  • buildahAlmaLinux:9all versions · fixed in 2:1.43.1-3.el9_8and 1 other package
  • buildahAlmaLinux:8all versions · fixed in 2:1.33.14-4.module_el8.10.0+4213+0493256band 1 other package
  • cockpit-podmanAlmaLinux:8all versions · fixed in 84.1-1.module_el8.10.0+4102+6c76e544

55 more package ranges on OSV.dev

Vendor advisories

  • CVE-2026-39832 Red Hat Product Security1,058 products fixed · 64 known affected

    golang.org/x/crypto/ssh/agent: golang.org/x/crypto/ssh/agent: Security bypass due to improper handling of key restrictions

    assisted/agent-preinstall-image-builder-rhel9 as a component of Assisted Installer for Red Hat OpenShift Container Platform 2 · external-secrets-operator/external-secrets-rhel9 as a component of External Secrets Operator for Red Hat OpenShift · openshift-pipelines-client.src as a component of OpenShift Pipelines · +61 more

  • 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

  • RHSA-2026:82322 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: cert-manager Operator for Red Hat OpenShift 1.17.2

46 more advisories

Full record on NVD

Fix

  1. Update Golang crypto to 0.52.0
  2. 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.…
  3. 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.…
  4. 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.…
  5. 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.…
  6. 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…
  7. Vendor fix Red Hat Product Security RHSA-2026:73853 · 4 productsFor OpenShift Container Platform 4.16 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.…

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
Published
2026-05-22
Last Modified
2026-09-15
NVD status
Modified
MSRC Title
Invoking agent constraints dropped when forwarding keys in golang.org/x/crypto/ssh/agent

Frequently asked questions

What is CVE-2026-39832?

When adding a key to a remote agent constraint extensions such as restrict-destination-v00@openssh.com were not serialized in the request. Destination restrictions were silently stripped when forwarding keys, allowing unrestricted use of the key on the remote host. The client now serializes all constraint extensions. Additionally, the in-memory keyring returned by NewKeyring() now rejects keys with unsupported constraint extensions instead of silently ignoring them.

Is CVE-2026-39832 actively exploited?

Active exploitation of CVE-2026-39832 has not been confirmed. Its EPSS score was 0.7% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-39832?

CVE-2026-39832 has a CVSS v3 base score of 8.7 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N.

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