# CVE-2026-39834: Invoking  infinite loop on large channel writes in golang.org/x/crypto/ssh

CVE-2026-39834 is fixed in 38 products on 1 platform, first by golang-go.crypto-dev 1:0.0~git20170629.0.5ef0053-2ubuntu0.1~esm2, released May 21, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-39834
- Priority: High
- CVSS: 9.1 (Important)
- EPSS: 0.0060
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 21, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-39834

## Description

When writing data larger than 4GB in a single Write call on an SSH channel, an integer overflow in the internal payload size calculation caused the write loop to spin indefinitely, sending empty packets without making progress. The size comparison now uses int64 to prevent truncation.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | alloy opensuse-leap 16.0 | 1.17.0-160000.1.1 | [OPENSUSE-SU-2026:21251-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21251-1.md) | Jul 7, 2026 |
| Linux | alloy sles 15.7 | 1.17.1-150700.15.23.1 | [SUSE-SU-2026:2824-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2824-1.md) | Jul 9, 2026 |
| Linux | alloy sles 16.0 | 1.17.0-160000.1.1 | [SUSE-SU-2026:22575-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22575-1.md) | Jul 7, 2026 |
| Linux | amazon-cloudwatch-agent amzn 2023 | 1.300069.1-1.amzn2023 | [ALAS2023-2026-2025](https://patchblox.com/security/data/fix/linux/alas2023-2026-2025.md) | Aug 3, 2026 |
| Linux | amazon-ssm-agent amzn 2023 | 3.3.4624.0-1.amzn2023 | [ALAS2023-2026-1952](https://patchblox.com/security/data/fix/linux/alas2023-2026-1952.md) | Jul 20, 2026 |
| Linux | amazon-ssm-agent opensuse-leap 16.0 | 3.3.4624.0-160000.1.1 | [OPENSUSE-SU-2026:21079-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21079-1.md) | Jun 17, 2026 |
| Linux | amazon-ssm-agent sles 15.6 | 3.3.4624.0-150000.5.37.1 | [SUSE-SU-2026:2467-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2467-1.md) | Jun 19, 2026 |
| Linux | amazon-ssm-agent sles 15.7 | 3.3.4624.0-150000.5.37.1 | [SUSE-SU-2026:2467-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2467-1.md) | Jun 19, 2026 |
| Linux | amazon-ssm-agent sles 16.0 | 3.3.4624.0-160000.1.1 | [SUSE-SU-2026:22157-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22157-1.md) | Jun 17, 2026 |
| Linux | apptainer sles 15.7 | 1.5.1-150600.4.24.1 | [SUSE-SU-2026:2609-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2609-1.md) | Jun 24, 2026 |
| Linux | buildah sles 15.6 | 1.35.5-150500.3.62.1 | [SUSE-SU-2026:2733-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2733-1.md) | Jul 2, 2026 |
| Linux | buildah sles 15.7 | 1.35.5-150500.3.62.1 | [SUSE-SU-2026:2733-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2733-1.md) | Jul 2, 2026 |
| Linux | cloudflared opensuse-leap 16.0 | 2026.9.1-bp160.1.1 | [OPENSUSE-SU-2026:21924-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21924-1.md) | Sep 21, 2026 |
| Linux | containerd amzn 2023 | 2.2.4-1.amzn2023.0.1 | [ALAS2023-2026-1784](https://patchblox.com/security/data/fix/linux/alas2023-2026-1784.md) | Jun 8, 2026 |
| Linux | containerd-debuginfo amzn 2023 | 2.2.4-1.amzn2023.0.1 | [ALAS2023-2026-1784](https://patchblox.com/security/data/fix/linux/alas2023-2026-1784.md) | Jun 8, 2026 |
| Linux | containerd-debugsource amzn 2023 | 2.2.4-1.amzn2023.0.1 | [ALAS2023-2026-1784](https://patchblox.com/security/data/fix/linux/alas2023-2026-1784.md) | Jun 8, 2026 |
| Linux | containerd-stress amzn 2023 | 2.2.4-1.amzn2023.0.1 | [ALAS2023-2026-1784](https://patchblox.com/security/data/fix/linux/alas2023-2026-1784.md) | Jun 8, 2026 |
| Linux | containerd-stress-debuginfo amzn 2023 | 2.2.4-1.amzn2023.0.1 | [ALAS2023-2026-1784](https://patchblox.com/security/data/fix/linux/alas2023-2026-1784.md) | Jun 8, 2026 |
| Linux | containerized-data-importer sles 15.7 | 1.64.0-150700.9.14.1 | [SUSE-SU-2026:4209-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4209-1.md) | Sep 16, 2026 |
| Linux | containerized-data-importer1.65 opensuse-leap 16.0 | 1.65.0-160000.3.1 | [OPENSUSE-SU-2026:21824-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21824-1.md) | Sep 9, 2026 |
| Linux | cosign opensuse-leap 16.0 | 3.1.1-160000.1.1 | [OPENSUSE-SU-2026:21281-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21281-1.md) | Jul 10, 2026 |
| Linux | cosign sles 15.6 | 3.1.1-150400.3.45.1 | [SUSE-SU-2026:2827-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2827-1.md) | Jul 9, 2026 |
| Linux | cosign sles 15.7 | 3.1.1-150400.3.45.1 | [SUSE-SU-2026:2827-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2827-1.md) | Jul 9, 2026 |
| Linux | cosign sles 16.0 | 3.1.1-160000.1.1 | [SUSE-SU-2026:22613-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22613-1.md) | Jul 10, 2026 |
| Linux | distribution opensuse-leap 16.0 | 3.1.1-160000.1.1 | [OPENSUSE-SU-2026:21084-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21084-1.md) | Jun 18, 2026 |
| Linux | distribution sles 15.6 | 3.1.1-150400.9.41.1 | [SUSE-SU-2026:4212-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4212-1.md) | Sep 16, 2026 |
| Linux | distribution sles 15.7 | 3.1.1-150400.9.41.1 | [SUSE-SU-2026:4212-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4212-1.md) | Sep 16, 2026 |
| Linux | distribution sles 16.0 | 3.1.1-160000.1.1 | [SUSE-SU-2026:22159-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22159-1.md) | Jun 18, 2026 |
| Linux | glab opensuse-leap 16.0 | 1.114.0-bp160.1.1 | [OPENSUSE-SU-2026:21662-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21662-1.md) | Aug 26, 2026 |
| Linux | golang-go.crypto Debian 14 | 1:0.52.0-1 | [DEBIAN-CVE-2026-39834](https://patchblox.com/security/data/fix/linux/debian-cve-2026-39834.md) | May 22, 2026 |
| Linux | golang-go.crypto-dev Ubuntu 18.04.6 LTS (bionic) | 1:0.0~git20170629.0.5ef0053-2ubuntu0.1~esm2 | [golang-go.crypto-dev 1:0.0~git20170629.0.5ef0053-2ubuntu0.1~esm2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-golang-go.crypto-dev-1-0.0-git20170629.0.5ef0053-2ubuntu0.1-esm2.md) | May 21, 2026 |
| Linux | golang-golang-x-crypto-dev Ubuntu 18.04.6 LTS (bionic) | 1:0.0~git20170629.0.5ef0053-2ubuntu0.1~esm2 | [golang-golang-x-crypto-dev 1:0.0~git20170629.0.5ef0053-2ubuntu0.1~esm2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-golang-golang-x-crypto-dev-1-0.0-git20170629.0.5ef0053-2ubuntu0.1-esm2.md) | May 21, 2026 |
| Linux | golang-golang-x-crypto-dev Ubuntu 20.04 LTS (focal) | 1:0.0~git20200221.2aa609c-1ubuntu0.1~esm2 | [golang-golang-x-crypto-dev 1:0.0~git20200221.2aa609c-1ubuntu0.1~esm2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-golang-golang-x-crypto-dev-1-0.0-git20200221.2aa609c-1ubuntu0.1-esm2.md) | May 21, 2026 |
| Linux | golang-golang-x-crypto-dev Ubuntu 22.04.1 LTS (jammy) | 1:0.0~git20211202.5770296-1ubuntu0.1~esm2 | [golang-golang-x-crypto-dev 1:0.0~git20211202.5770296-1ubuntu0.1~esm2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-golang-golang-x-crypto-dev-1-0.0-git20211202.5770296-1ubuntu0.1-esm2.md) | May 21, 2026 |
| Linux | golang-golang-x-crypto-dev Ubuntu 24.04.5 LTS (noble) | 1:0.19.0-1ubuntu0.1~esm2 | [golang-golang-x-crypto-dev 1:0.19.0-1ubuntu0.1~esm2](https://patchblox.com/security/data/fix/linux/ubuntu-noble-golang-golang-x-crypto-dev-1-0.19.0-1ubuntu0.1-esm2.md) | May 21, 2026 |
| Linux | golang-golang-x-crypto-dev Ubuntu 26.04.1 LTS (resolute) | 1:0.47.0-1ubuntu0.1~esm1 | [golang-golang-x-crypto-dev 1:0.47.0-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-golang-golang-x-crypto-dev-1-0.47.0-1ubuntu0.1-esm1.md) | May 21, 2026 |
| Linux | google-guest-agent Ubuntu 18.04.6 LTS (bionic) | 20241011.01-0ubuntu1~18.04.0+esm3 | [google-guest-agent 20241011.01-0ubuntu1~18.04.0+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-google-guest-agent-20241011.01-0ubuntu1-18.04.0-esm3.md) | May 21, 2026 |
| Linux | google-guest-agent Ubuntu 20.04 LTS (focal) | 20250116.00-0ubuntu1~20.04.0+esm3 | [google-guest-agent 20250116.00-0ubuntu1~20.04.0+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-google-guest-agent-20250116.00-0ubuntu1-20.04.0-esm3.md) | May 21, 2026 |
| Linux | google-guest-agent Ubuntu 22.04.1 LTS (jammy) | 20250116.00-0ubuntu1~22.04.3 | [google-guest-agent 20250116.00-0ubuntu1~22.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-google-guest-agent-20250116.00-0ubuntu1-22.04.3.md) | May 21, 2026 |
| Linux | google-guest-agent Ubuntu 24.04.5 LTS (noble) | 20250116.00-0ubuntu1~24.04.4 | [google-guest-agent 20250116.00-0ubuntu1~24.04.4](https://patchblox.com/security/data/fix/linux/ubuntu-noble-google-guest-agent-20250116.00-0ubuntu1-24.04.4.md) | May 21, 2026 |
| Linux | google-guest-agent Ubuntu 25.10 (questing) | 20250506.01-0ubuntu1.2 | [google-guest-agent 20250506.01-0ubuntu1.2](https://patchblox.com/security/data/fix/linux/ubuntu-questing-google-guest-agent-20250506.01-0ubuntu1.2.md) | May 21, 2026 |
| Linux | google-guest-agent Ubuntu 26.04.1 LTS (resolute) | 20250506.01-0ubuntu2.1 | [google-guest-agent 20250506.01-0ubuntu2.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-google-guest-agent-20250506.01-0ubuntu2.1.md) | May 21, 2026 |
| Linux | google-guest-agent opensuse-leap 16.0 | 20260529.00-160000.1.1 | [OPENSUSE-SU-2026:21069-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21069-1.md) | Jun 26, 2026 |
| Linux | google-guest-agent sles 15.6 | 20260529.00-150000.1.70.1 | [SUSE-SU-2026:2612-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2612-1.md) | Jun 24, 2026 |
| Linux | google-guest-agent sles 15.7 | 20260529.00-150000.1.70.1 | [SUSE-SU-2026:2612-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2612-1.md) | Jun 24, 2026 |
| Linux | google-guest-agent sles 16.0 | 20260529.00-160000.1.1 | [SUSE-SU-2026:22376-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22376-1.md) | Jun 26, 2026 |
| Linux | google-osconfig-agent opensuse-leap 16.0 | 20260615.01-160000.1.2 | [OPENSUSE-SU-2026:21210-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21210-1.md) | Jul 6, 2026 |
| Linux | google-osconfig-agent sles 15.6 | 20260615.01-150000.1.55.1 | [SUSE-SU-2026:2611-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2611-1.md) | Jun 24, 2026 |
| Linux | google-osconfig-agent sles 15.7 | 20260615.01-150000.1.55.1 | [SUSE-SU-2026:2611-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2611-1.md) | Jun 24, 2026 |
| Linux | google-osconfig-agent sles 16.0 | 20260615.01-160000.1.2 | [SUSE-SU-2026:22558-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22558-1.md) | Jul 6, 2026 |
| Linux | govulncheck-vulndb opensuse-leap 16.0 | 0.0.20260723T184607-160000.1.1 | [OPENSUSE-SU-2026:21483-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21483-1.md) | Jul 30, 2026 |
| Linux | keepassxc Fedora 43 | 2.8.0-2.fc43 | [FEDORA-2026-4D8F0CDDEF](https://patchblox.com/security/data/fix/linux/fedora-2026-4d8f0cddef.md) | Nov 7, 2026 |
| Linux | keepassxc-debuginfo Fedora 43 | 2.8.0-2.fc43 | [FEDORA-2026-4D8F0CDDEF](https://patchblox.com/security/data/fix/linux/fedora-2026-4d8f0cddef.md) | Nov 7, 2026 |
| Linux | keepassxc-debugsource Fedora 43 | 2.8.0-2.fc43 | [FEDORA-2026-4D8F0CDDEF](https://patchblox.com/security/data/fix/linux/fedora-2026-4d8f0cddef.md) | Nov 7, 2026 |
| Linux | kubevirt sles 15.7 | 1.7.4-150700.3.30.1 | [SUSE-SU-2026:3203-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3203-1.md) | Jul 23, 2026 |
| Linux | kubevirt1.8 opensuse-leap 16.0 | 1.8.4-160000.1.1 | [OPENSUSE-SU-2026:21590-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21590-1.md) | Aug 18, 2026 |
| Linux | lxd Ubuntu 18.04.6 LTS (bionic) | 3.0.3-0ubuntu1~18.04.2+esm3 | [lxd 3.0.3-0ubuntu1~18.04.2+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-lxd-3.0.3-0ubuntu1-18.04.2-esm3.md) | May 21, 2026 |
| Linux | lxd-client Ubuntu 18.04.6 LTS (bionic) | 3.0.3-0ubuntu1~18.04.2+esm3 | [lxd-client 3.0.3-0ubuntu1~18.04.2+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-lxd-client-3.0.3-0ubuntu1-18.04.2-esm3.md) | May 21, 2026 |
| Linux | lxd-tools Ubuntu 18.04.6 LTS (bionic) | 3.0.3-0ubuntu1~18.04.2+esm3 | [lxd-tools 3.0.3-0ubuntu1~18.04.2+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-lxd-tools-3.0.3-0ubuntu1-18.04.2-esm3.md) | May 21, 2026 |
| Linux | mcphost opensuse-leap 16.0 | 0.34.0-160000.2.1 | [OPENSUSE-SU-2026:21120-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21120-1.md) | Jun 20, 2026 |
| Linux | mcphost sles 16.0 | 0.34.0-160000.2.1 | [SUSE-SU-2026:22193-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22193-1.md) | Jun 20, 2026 |
| Linux | nerdctl amzn 2023 | 2.2.2-1.amzn2023.0.3 | [ALAS2023-2026-1788](https://patchblox.com/security/data/fix/linux/alas2023-2026-1788.md) | Jun 8, 2026 |
| Linux | podman opensuse-leap 16.0 | 5.4.2-160000.5.1 | [OPENSUSE-SU-2026:21244-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21244-1.md) | Jul 6, 2026 |
| Linux | rclone amzn 2023 | 1.74.2-80.amzn2023 | [ALAS2023-2026-1810](https://patchblox.com/security/data/fix/linux/alas2023-2026-1810.md) | Jun 8, 2026 |
| Linux | rclone opensuse-leap 16.0 | 1.74.4-bp160.1.1 | [OPENSUSE-SU-2026:21436-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21436-1.md) | Jul 22, 2026 |
| Linux | rclone-debuginfo amzn 2023 | 1.74.2-80.amzn2023 | [ALAS2023-2026-1810](https://patchblox.com/security/data/fix/linux/alas2023-2026-1810.md) | Jun 8, 2026 |
| Linux | rclone-debugsource amzn 2023 | 1.74.2-80.amzn2023 | [ALAS2023-2026-1810](https://patchblox.com/security/data/fix/linux/alas2023-2026-1810.md) | Jun 8, 2026 |
| Linux | runfinch-finch amzn 2023 | 1.17.1-1.amzn2023.0.2 | [ALAS2023-2026-1809](https://patchblox.com/security/data/fix/linux/alas2023-2026-1809.md) | Jun 8, 2026 |
| Linux | trivy opensuse-leap 16.0 | 0.71.0-160000.1.1 | [OPENSUSE-SU-2026:20956-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20956-1.md) | Jun 11, 2026 |

---

Data as of 2026-11-08T19:12:23Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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