# CVE-2026-39833: Invoking key constraints not enforced in golang.org/x/crypto/ssh/agent CVE-2026-39833 is fixed in 41 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-2026-39833 - Priority: High - CVSS: 9.1 (Important) - EPSS: 0.0047 - 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-2026-39833 ## Description This update for buildah fixes the following issues - CVE-2026-25680,CVE-2026-25681,CVE-2026-27136,CVE-2026-42502,CVE-2026-42506: golang.org/x/net/html: multiple issues when parsing HTML files (bsc#1267179). - CVE-2026-34986: github.com/go-jose/go-jose/v4,github.com/go-jose/go-jose/v3: crafted JWE input with a missing encrypted key can lead to a denial of service (bsc#1262953). - CVE-2026-39821: golang.org/x/net/idna: failure to reject ASCII-only Punycode-encoded labels allows for validation bypass and privilege escalation (bsc#1266648). - CVE-2026-39827: Invoking memory leak when rejecting channels can lead to DoS in golang.org/x/crypto/ssh (bsc#1266191). - CVE-2026-39828: Invoking bypass of certificate restrictions in golang.org/x/crypto/ssh (bsc#1266191). - CVE-2026-39829: Invoking pathological RSA/DSA parameters may cause DoS in golang.org/x/crypto/ssh (bsc#1266191). - CVE-2026-39830: Invoking client can cause server deadlock on unexpected responses in golang.org/x/crypto/ssh (bsc#1266191). - CVE-2026-39831: Invoking bypass of FIDO/U2F security keys physical interaction in golang.org/x/crypto/ssh (bsc#1266191). - CVE-2026-39832: Invoking agent constraints dropped when forwarding keys in golang.org/x/crypto/ssh/agent (bsc#1266191). - CVE-2026-39833: Invoking key constraints not enforced in golang.org/x/crypto/ssh/agent (bsc#1266191). - CVE-2026-39834: Invoking infinite loop on large channel writes in golang.org/x/crypto/ssh (bsc#1266191). - CVE-2026-39835: Invoking server panic during CheckHostKey/Authenticate in golang.org/x/crypto/ssh (bsc#1266191). - CVE-2026-42508: Invoking auth bypass via unenforced @revoked status in golang.org/x/crypto/ssh/knownhosts (bsc#1266191). - CVE-2026-46595: Invoking VerifiedPublicKeyCallback permissions skip enforcement in golang.org/x/crypto/ssh (bsc#1266191). - CVE-2026-46597: Invoking byte arithmetic causes underflow and panic in golang.org/x/crypto/ssh (bsc#1266191). - CVE-2026-46598: Invoking pathological inputs can lead to client panic in golang.org/x/crypto/ssh/agent (bsc#1266191). ## 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 | 1.300067.1-1.amzn2023 | [ALAS2023-2026-1896](https://patchblox.com/security/data/fix/linux/alas2023-2026-1896.md) | Jun 22, 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 | docker amzn 2023 | 25.0.16-1.amzn2023.0.1 | [ALAS2023-2026-1783](https://patchblox.com/security/data/fix/linux/alas2023-2026-1783.md) | Jun 8, 2026 | | Linux | docker-debuginfo amzn 2023 | 25.0.16-1.amzn2023.0.1 | [ALAS2023-2026-1783](https://patchblox.com/security/data/fix/linux/alas2023-2026-1783.md) | Jun 8, 2026 | | Linux | docker-debugsource amzn 2023 | 25.0.16-1.amzn2023.0.1 | [ALAS2023-2026-1783](https://patchblox.com/security/data/fix/linux/alas2023-2026-1783.md) | Jun 8, 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-2026-39833](https://patchblox.com/security/data/fix/linux/debian-cve-2026-39833.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 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 | 0.0.20260827T195228-160000.1.1 | [OPENSUSE-SU-2026:21761-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21761-1.md) | Sep 4, 2026 | | Linux | govulncheck-vulndb sles 16.0 | 0.0.20260827T195228-160000.1.1 | [SUSE-SU-2026:23625-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23625-1.md) | Sep 4, 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 | restic Fedora 43 | 0.19.1-1.fc43 | [FEDORA-2026-A006788209](https://patchblox.com/security/data/fix/linux/fedora-2026-a006788209.md) | Jul 20, 2026 | | Linux | restic-debuginfo Fedora 43 | 0.19.1-1.fc43 | [FEDORA-2026-A006788209](https://patchblox.com/security/data/fix/linux/fedora-2026-a006788209.md) | Jul 20, 2026 | | Linux | restic-debugsource Fedora 43 | 0.19.1-1.fc43 | [FEDORA-2026-A006788209](https://patchblox.com/security/data/fix/linux/fedora-2026-a006788209.md) | Jul 20, 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 2026-11-08T13:06:02Z UTC. 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