# CVE-2026-56855: Prevent DoS on deadlocked established channel in golang.org/x/crypto/ssh CVE-2026-56855 is fixed in 32 products on 1 platform, first by DEBIAN-CVE-2026-56855, released September 8, 2026. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2026-56855 - Priority: High - CVSS: 7.5 (Moderate) - EPSS: 0.0050 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Sep 2, 2026 - Weakness: Allocation of Resources Without Limits or Throttling - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56855 ## Description The buildah package provides a tool for facilitating building OCI container images. Among other things, buildah enables you to: Create a working container, either from scratch or using an image as a starting point; Create an image, either from a working container or using the instructions in a Dockerfile; Build both Docker and OCI images. Security Fix(es): * podman: Arbitrary file write when importing OCI archive (CVE-2025-11395) * golang.org/x/crypto/ssh: golang.org/x/crypto/ssh: Denial of Service via crafted messages (CVE-2026-56855) * net/[http:](http:) golang: golang: Denial of Service via crafted HTTP Range headers (CVE-2026-78667) * crypto/x509: golang: crypto/x509: Man-in-the-middle attacks via untrusted intermediate certificates (CVE-2026-111943) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | alloy opensuse-leap 16.0 | 1.19.2-160000.1.1 | [OPENSUSE-SU-2026:22032-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-22032-1.md) | Oct 6, 2026 | | Linux | alloy sles 15.7 | 1.19.2-150700.15.29.1 | [SUSE-SU-2026:4408-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4408-1.md) | Oct 1, 2026 | | Linux | alloy sles 16.0 | 1.19.2-160000.1.1 | [SUSE-SU-2026:24148-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-24148-1.md) | Oct 6, 2026 | | Linux | amazon-ssm-agent amzn 2023 | 3.3.5390.0-1.amzn2023 | [ALAS2023-2026-3160](https://patchblox.com/security/data/fix/linux/alas2023-2026-3160.md) | Nov 7, 2026 | | Linux | amazon-ssm-agent opensuse-leap 16.0 | 3.3.5390.0-160000.1.1 | [OPENSUSE-SU-2026:21884-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21884-1.md) | Sep 20, 2026 | | Linux | amazon-ssm-agent sles 15.6 | 3.3.5390.0-150000.5.43.1 | [SUSE-SU-2026:4372-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4372-1.md) | Sep 28, 2026 | | Linux | amazon-ssm-agent sles 15.7 | 3.3.5390.0-150000.5.43.1 | [SUSE-SU-2026:4372-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4372-1.md) | Sep 28, 2026 | | Linux | apptainer opensuse-leap 16.0 | 1.5.3-bp160.4.1 | [OPENSUSE-SU-2026:21927-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21927-1.md) | Sep 21, 2026 | | Linux | apptainer sles 15.7 | 1.5.3-150600.4.43.1 | [SUSE-SU-2026:4308-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4308-1.md) | Sep 23, 2026 | | Linux | buildah RHEL 9 | 2:1.43.4-2.el9_8 | [RHSA-2026:90424](https://patchblox.com/security/data/fix/linux/rhsa-2026-90424.md) | Sep 24, 2026 | | Linux | buildah almalinux 9 | 2:1.43.4-2.el9_8 | [ALSA-2026:90424](https://patchblox.com/security/data/fix/linux/alsa-2026-90424.md) | Nov 7, 2026 | | Linux | buildah ol 9 | 2:1.43.3-2.0.1.el9_8 | [ELSA-2026-70640](https://patchblox.com/security/data/fix/linux/elsa-2026-70640.md) | Sep 24, 2026 | | Linux | buildah rocky 9 | 2:1.43.4-2.el9_8 | [RLSA-2026:90424](https://patchblox.com/security/data/fix/linux/rlsa-2026-90424.md) | Nov 7, 2026 | | Linux | buildah-tests RHEL 9 | 2:1.43.4-2.el9_8 | [RHSA-2026:90424](https://patchblox.com/security/data/fix/linux/rhsa-2026-90424.md) | Sep 24, 2026 | | Linux | buildah-tests almalinux 9 | 2:1.43.4-2.el9_8 | [ALSA-2026:90424](https://patchblox.com/security/data/fix/linux/alsa-2026-90424.md) | Nov 7, 2026 | | Linux | buildah-tests ol 9 | 2:1.43.3-2.0.1.el9_8 | [ELSA-2026-70640](https://patchblox.com/security/data/fix/linux/elsa-2026-70640.md) | Sep 24, 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 | 2.3.7-1.amzn2023.0.1 | [ALAS2023-2026-3273](https://patchblox.com/security/data/fix/linux/alas2023-2026-3273.md) | Nov 7, 2026 | | Linux | containerd-debuginfo amzn 2023 | 2.3.7-1.amzn2023.0.1 | [ALAS2023-2026-3273](https://patchblox.com/security/data/fix/linux/alas2023-2026-3273.md) | Nov 7, 2026 | | Linux | containerd-debugsource amzn 2023 | 2.3.7-1.amzn2023.0.1 | [ALAS2023-2026-3273](https://patchblox.com/security/data/fix/linux/alas2023-2026-3273.md) | Nov 7, 2026 | | Linux | containerd-stress amzn 2023 | 2.3.7-1.amzn2023.0.1 | [ALAS2023-2026-3273](https://patchblox.com/security/data/fix/linux/alas2023-2026-3273.md) | Nov 7, 2026 | | Linux | containerd-stress-debuginfo amzn 2023 | 2.3.7-1.amzn2023.0.1 | [ALAS2023-2026-3273](https://patchblox.com/security/data/fix/linux/alas2023-2026-3273.md) | Nov 7, 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 | 3.1.3-160000.1.1 | [OPENSUSE-SU-2026:22064-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-22064-1.md) | Nov 7, 2026 | | Linux | cosign sles 15.6 | 3.1.3-150400.3.57.1 | [SUSE-SU-2026:4392-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4392-1.md) | Sep 29, 2026 | | Linux | cosign sles 15.7 | 3.1.3-150400.3.57.1 | [SUSE-SU-2026:4392-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4392-1.md) | Sep 29, 2026 | | Linux | cosign sles 16.0 | 3.1.3-160000.1.1 | [SUSE-SU-2026:24213-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-24213-1.md) | Nov 7, 2026 | | Linux | gh opensuse-leap 16.0 | 2.100.0-bp160.1.1 | [OPENSUSE-SU-2026:21861-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21861-1.md) | Sep 15, 2026 | | Linux | golang-go.crypto Debian 14 | 1:0.56.0-1 | [DEBIAN-CVE-2026-56855](https://patchblox.com/security/data/fix/linux/debian-cve-2026-56855.md) | Sep 8, 2026 | | Linux | google-guest-agent opensuse-leap 16.0 | 20260903.01-160000.1.1 | [OPENSUSE-SU-2026:21879-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21879-1.md) | Sep 18, 2026 | | Linux | google-guest-agent sles 15.6 | 20260903.01-150000.1.85.1 | [SUSE-SU-2026:4270-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4270-1.md) | Sep 21, 2026 | | Linux | google-guest-agent sles 15.7 | 20260903.01-150000.1.85.1 | [SUSE-SU-2026:4270-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4270-1.md) | Sep 21, 2026 | | Linux | google-osconfig-agent opensuse-leap 16.0 | 20260911.00-160000.1.1 | [OPENSUSE-SU-2026:21882-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21882-1.md) | Sep 19, 2026 | | Linux | google-osconfig-agent sles 15.6 | 20260911.00-150000.1.67.1 | [SUSE-SU-2026:4293-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4293-1.md) | Sep 23, 2026 | | Linux | google-osconfig-agent sles 15.7 | 20260911.00-150000.1.67.1 | [SUSE-SU-2026:4293-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4293-1.md) | Sep 23, 2026 | | Linux | govulncheck-vulndb opensuse-leap 16.0 | 0.0.20260902T191204-160000.1.1 | [OPENSUSE-SU-2026:21812-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21812-1.md) | Sep 8, 2026 | | Linux | govulncheck-vulndb sles 16.0 | 0.0.20260902T191204-160000.1.1 | [SUSE-SU-2026:23712-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23712-1.md) | Sep 8, 2026 | | Linux | hauler opensuse-leap 16.0 | 2.1.0-bp160.3.1 | [OPENSUSE-SU-2026:21841-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21841-1.md) | Sep 14, 2026 | | Linux | hcloud Fedora 43 | 1.69.0-1.fc43 | [FEDORA-2026-6D4A64A6B0](https://patchblox.com/security/data/fix/linux/fedora-2026-6d4a64a6b0.md) | Sep 30, 2026 | | Linux | hcloud-debuginfo Fedora 43 | 1.69.0-1.fc43 | [FEDORA-2026-6D4A64A6B0](https://patchblox.com/security/data/fix/linux/fedora-2026-6d4a64a6b0.md) | Sep 30, 2026 | | Linux | hcloud-debugsource Fedora 43 | 1.69.0-1.fc43 | [FEDORA-2026-6D4A64A6B0](https://patchblox.com/security/data/fix/linux/fedora-2026-6d4a64a6b0.md) | Sep 30, 2026 | | Linux | helm opensuse-leap 16.0 | 4.3.0-160000.1.1 | [OPENSUSE-SU-2026:21983-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21983-1.md) | Sep 30, 2026 | | Linux | helm sles 16.0 | 4.3.0-160000.1.1 | [SUSE-SU-2026:23984-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23984-1.md) | Sep 30, 2026 | | Linux | keybase-client opensuse-leap 16.0 | 6.6.3-bp160.3.1 | [OPENSUSE-SU-2026:21846-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21846-1.md) | Sep 14, 2026 | | Linux | nerdctl amzn 2023 | 2.3.5-1.amzn2023.0.2 | [ALAS2023-2026-3274](https://patchblox.com/security/data/fix/linux/alas2023-2026-3274.md) | Nov 7, 2026 | | Linux | rclone amzn 2023 | 1.75.1-1.amzn2023 | [ALAS2023-2026-3129](https://patchblox.com/security/data/fix/linux/alas2023-2026-3129.md) | Sep 28, 2026 | | Linux | rclone opensuse-leap 16.0 | 1.75.1-bp160.1.1 | [OPENSUSE-SU-2026:21999-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21999-1.md) | Sep 28, 2026 | | Linux | rclone-debuginfo amzn 2023 | 1.75.1-1.amzn2023 | [ALAS2023-2026-3129](https://patchblox.com/security/data/fix/linux/alas2023-2026-3129.md) | Sep 28, 2026 | | Linux | rclone-debugsource amzn 2023 | 1.75.1-1.amzn2023 | [ALAS2023-2026-3129](https://patchblox.com/security/data/fix/linux/alas2023-2026-3129.md) | Sep 28, 2026 | | Linux | runfinch-finch amzn 2023 | 1.19.0-1.amzn2023.0.1 | [ALAS2023-2026-3140](https://patchblox.com/security/data/fix/linux/alas2023-2026-3140.md) | Sep 28, 2026 | | Linux | trivy opensuse-leap 16.0 | 0.74.0-160000.3.1 | [OPENSUSE-SU-2026:21835-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21835-1.md) | Sep 14, 2026 | | Linux | zk opensuse-leap 16.0 | 0.15.6-bp160.2.1 | [OPENSUSE-SU-2026:21814-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21814-1.md) | Sep 8, 2026 | --- Data as of 2026-11-09T01:18:40Z UTC. 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