CVE-2026-42505
Invoking Encrypted Client Hello privacy leak in crypto/tls
CVE-2026-42505 is fixed in 59 products on 2 platforms, first by ALSA-2026:37436, released July 9, 2026. It is not reported as exploited. Patch Radar priority: Routine.
RoutineFixed on 2 platforms
CVSS
5.3
Moderate
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0038
32nd percentile
Handshakes which used Encrypted Client Hello could be de-anonymized by a passive network observer due to a disclosure of pre-shared key identities in the unencrypted client hello.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Windows apps | |||
| Go Programming Language | 1.27.3 | Go Programming Language 1.27.3 | Oct 19, 2026 |
| Linux | |||
| amazon-cloudwatch-agent · amzn 2023 | 1.300069.1-1.amzn2023 | ALAS2023-2026-2025 | Aug 3, 2026 |
| amazon-ecr-credential-helper · amzn 2023 | 0.12.0-4.amzn2023 | ALAS2023-2026-3180 | Nov 7, 2026 |
| amazon-ssm-agent · amzn 2023 | 3.3.5226.0-1.amzn2023 | ALAS2023-2026-3149 | Sep 30, 2026 |
| compat-golang-github-cpuguy83-md2man-2-devel · amzn 2023 | 2.0.2-24.amzn2023.0.9 | ALAS2023-2026-1989 | Jul 20, 2026 |
| containerd · amzn 2023 | 2.2.7-1.amzn2023.0.1 | ALAS2023-2026-2131 | Sep 9, 2026 |
| containerd-debuginfo · amzn 2023 | 2.2.7-1.amzn2023.0.1 | ALAS2023-2026-2131 | Sep 9, 2026 |
| containerd-debugsource · amzn 2023 | 2.2.7-1.amzn2023.0.1 | ALAS2023-2026-2131 | Sep 9, 2026 |
| containerd-stress · amzn 2023 | 2.2.7-1.amzn2023.0.1 | ALAS2023-2026-2131 | Sep 9, 2026 |
| containerd-stress-debuginfo · amzn 2023 | 2.2.7-1.amzn2023.0.1 | ALAS2023-2026-2131 | Sep 9, 2026 |
| credentials-fetcher · amzn 2023 | 2.0.3-1.amzn2023.0.2 | ALAS2023-2026-1975 | Jul 20, 2026 |
| delve · RHEL 8 | 0:1.26.1-1.module+el8.10.0+24516+40554724 | RHSA-2026:38995 | Jul 14, 2026 |
| delve · almalinux 8 | 1.26.1-1.module_el8.10.0+4223+bd807c2e | ALSA-2026:38995 | Jul 13, 2026 |
| docker · amzn 2023 | 25.0.16-1.amzn2023.0.5 | ALAS2023-2026-3205 | Nov 7, 2026 |
| docker-debuginfo · amzn 2023 | 25.0.16-1.amzn2023.0.5 | ALAS2023-2026-3205 | Nov 7, 2026 |
| docker-debugsource · amzn 2023 | 25.0.16-1.amzn2023.0.5 | ALAS2023-2026-3205 | Nov 7, 2026 |
| git-lfs · RHEL 9 | 0:3.7.1-4.el9_8.3 | RHSA-2026:66364 | Sep 13, 2026 |
| git-lfs · almalinux 9 | 3.7.1-4.el9_8.3 | ALSA-2026:66364 | Sep 10, 2026 |
| go-toolset · RHEL 8 | 0:1.26.5-1.module+el8.10.0+24506+6809f2d9 | RHSA-2026:38995 | Jul 14, 2026 |
| go-toolset · RHEL 9 | 0:1.26.5-1.el9_8 | RHSA-2026:37435 | Jul 11, 2026 |
| go-toolset · almalinux 10 | 1.26.5-1.el10_2.alma.1 | ALSA-2026:37436 | Jul 9, 2026 |
| go-toolset · almalinux 8 | 1.26.5-1.module_el8.10.0+4223+bd807c2e | ALSA-2026:38995 | Jul 13, 2026 |
| go-toolset · almalinux 9 | 1.26.5-1.el9_8 | ALSA-2026:37435 | Jul 9, 2026 |
| go1.25 · opensuse-leap 16.0 | 1.25.12-160000.1.1 | OPENSUSE-SU-2026:21324-1 | Jul 13, 2026 |
| go1.25 · sles 15.6 | 1.25.12-150000.1.44.1 | SUSE-SU-2026:2817-1 | Jul 9, 2026 |
| go1.25 · sles 15.7 | 1.25.12-150000.1.44.1 | SUSE-SU-2026:2817-1 | Jul 9, 2026 |
| go1.25 · sles 16.0 | 1.25.12-160000.1.1 | SUSE-SU-2026:22643-1 | Jul 13, 2026 |
| go1.25-openssl · opensuse-leap 16.0 | 1.25.12-160000.1.1 | OPENSUSE-SU-2026:21319-1 | Jul 13, 2026 |
| go1.25-openssl · sles 15.6 | 1.25.12-150600.13.21.1 | SUSE-SU-2026:3151-1 | Jul 21, 2026 |
| go1.25-openssl · sles 15.7 | 1.25.12-150600.13.21.1 | SUSE-SU-2026:3151-1 | Jul 21, 2026 |
| go1.25-openssl · sles 16.0 | 1.25.12-160000.1.1 | SUSE-SU-2026:22638-1 | Jul 13, 2026 |
| go1.26 · opensuse-leap 16.0 | 1.26.5-160000.1.1 | OPENSUSE-SU-2026:21341-1 | Jul 14, 2026 |
| go1.26 · sles 15.6 | 1.26.5-150000.1.18.1 | SUSE-SU-2026:2818-1 | Jul 9, 2026 |
| go1.26 · sles 15.7 | 1.26.5-150000.1.18.1 | SUSE-SU-2026:2818-1 | Jul 9, 2026 |
| go1.26 · sles 16.0 | 1.26.5-160000.1.1 | SUSE-SU-2026:22656-1 | Jul 14, 2026 |
| go1.26-openssl · opensuse-leap 16.0 | 1.26.5-160000.1.1 | OPENSUSE-SU-2026:21321-1 | Jul 13, 2026 |
| go1.26-openssl · sles 15.6 | 1.26.5-150600.13.9.1 | SUSE-SU-2026:3102-1 | Jul 17, 2026 |
| go1.26-openssl · sles 15.7 | 1.26.5-150600.13.9.1 | SUSE-SU-2026:3102-1 | Jul 17, 2026 |
| go1.26-openssl · sles 16.0 | 1.26.5-160000.1.1 | SUSE-SU-2026:22641-1 | Jul 13, 2026 |
| golang · RHEL 10 | 1.26.5-1.el10_2 | RHSA-2026:37436 | Aug 1, 2026 |
| golang · RHEL 8 | 0:1.26.5-1.module+el8.10.0+24506+6809f2d9 | RHSA-2026:38995 | Jul 14, 2026 |
| golang · RHEL 9 | 0:1.26.5-1.el9_8 | RHSA-2026:37435 | Jul 11, 2026 |
| golang · almalinux 10 | 1.26.5-1.el10_2.alma.1 | ALSA-2026:37436 | Jul 9, 2026 |
| golang · almalinux 8 | 1.26.5-1.module_el8.10.0+4223+bd807c2e | ALSA-2026:38995 | Jul 13, 2026 |
| golang · almalinux 9 | 1.26.5-1.el9_8 | ALSA-2026:37435 | Jul 9, 2026 |
| golang · amzn 2023 | 1.25.12-1.amzn2023.0.1 | ALAS2023-2026-1979 | Jul 20, 2026 |
| golang-1.26 · Debian 14 | 1.26.5-1 | DEBIAN-CVE-2026-42505 | Jul 10, 2026 |
| golang-1.27 · Debian 14 | 1.27~rc2-1 | DEBIAN-CVE-2026-42505 | Jul 10, 2026 |
| golang-bin · RHEL 8 | 0:1.26.5-1.module+el8.10.0+24506+6809f2d9 | RHSA-2026:38995 | Jul 14, 2026 |
| golang-bin · RHEL 9 | 0:1.26.5-1.el9_8 | RHSA-2026:37435 | Jul 11, 2026 |
| golang-bin · almalinux 10 | 1.26.5-1.el10_2.alma.1 | ALSA-2026:37436 | Jul 9, 2026 |
| golang-bin · almalinux 8 | 1.26.5-1.module_el8.10.0+4223+bd807c2e | ALSA-2026:38995 | Jul 13, 2026 |
| golang-bin · almalinux 9 | 1.26.5-1.el9_8 | ALSA-2026:37435 | Jul 9, 2026 |
| golang-bin · amzn 2023 | 1.25.12-1.amzn2023.0.1 | ALAS2023-2026-1979 | Jul 20, 2026 |
| golang-docs · RHEL 8 | 0:1.26.5-1.module+el8.10.0+24506+6809f2d9 | RHSA-2026:38995 | Jul 14, 2026 |
| golang-docs · RHEL 9 | 0:1.26.5-1.el9_8 | RHSA-2026:37435 | Jul 11, 2026 |
| golang-docs · almalinux 10 | 1.26.5-1.el10_2.alma.1 | ALSA-2026:37436 | Jul 9, 2026 |
| golang-docs · almalinux 8 | 1.26.5-1.module_el8.10.0+4223+bd807c2e | ALSA-2026:38995 | Jul 13, 2026 |
| golang-docs · almalinux 9 | 1.26.5-1.el9_8 | ALSA-2026:37435 | Jul 9, 2026 |
| golang-docs · amzn 2023 | 1.25.12-1.amzn2023.0.1 | ALAS2023-2026-1979 | Jul 20, 2026 |
| golang-github-burntsushi-toml · amzn 2023 | 1.5.0-1.amzn2023.0.3 | ALAS2023-2026-1978 | Jul 20, 2026 |
| golang-github-burntsushi-toml-debuginfo · amzn 2023 | 1.5.0-1.amzn2023.0.3 | ALAS2023-2026-1978 | Jul 20, 2026 |
| golang-github-burntsushi-toml-debugsource · amzn 2023 | 1.5.0-1.amzn2023.0.3 | ALAS2023-2026-1978 | Jul 20, 2026 |
| golang-github-burntsushi-toml-devel · amzn 2023 | 1.5.0-1.amzn2023.0.3 | ALAS2023-2026-1978 | Jul 20, 2026 |
| golang-github-burntsushi-toml-test · amzn 2023 | 0.2.0-8.amzn2023.0.5 | ALAS2023-2026-1977 | Jul 20, 2026 |
| golang-github-burntsushi-toml-test-debuginfo · amzn 2023 | 0.2.0-8.amzn2023.0.5 | ALAS2023-2026-1977 | Jul 20, 2026 |
| golang-github-burntsushi-toml-test-debugsource · amzn 2023 | 0.2.0-8.amzn2023.0.5 | ALAS2023-2026-1977 | Jul 20, 2026 |
| golang-github-burntsushi-toml-test-devel · amzn 2023 | 0.2.0-8.amzn2023.0.5 | ALAS2023-2026-1977 | Jul 20, 2026 |
| golang-github-cpuguy83-md2man · amzn 2023 | 2.0.2-24.amzn2023.0.9 | ALAS2023-2026-1989 | Jul 20, 2026 |
| golang-github-cpuguy83-md2man-debuginfo · amzn 2023 | 2.0.2-24.amzn2023.0.9 | ALAS2023-2026-1989 | Jul 20, 2026 |
| golang-github-cpuguy83-md2man-debugsource · amzn 2023 | 2.0.2-24.amzn2023.0.9 | ALAS2023-2026-1989 | Jul 20, 2026 |
| golang-github-cpuguy83-md2man-devel · amzn 2023 | 2.0.2-24.amzn2023.0.9 | ALAS2023-2026-1989 | Jul 20, 2026 |
| golang-misc · RHEL 8 | 0:1.26.5-1.module+el8.10.0+24506+6809f2d9 | RHSA-2026:38995 | Jul 14, 2026 |
| golang-misc · RHEL 9 | 0:1.26.5-1.el9_8 | RHSA-2026:37435 | Jul 11, 2026 |
| golang-misc · almalinux 10 | 1.26.5-1.el10_2.alma.1 | ALSA-2026:37436 | Jul 9, 2026 |
| golang-misc · almalinux 8 | 1.26.5-1.module_el8.10.0+4223+bd807c2e | ALSA-2026:38995 | Jul 13, 2026 |
| golang-misc · almalinux 9 | 1.26.5-1.el9_8 | ALSA-2026:37435 | Jul 9, 2026 |
| golang-misc · amzn 2023 | 1.25.12-1.amzn2023.0.1 | ALAS2023-2026-1979 | Jul 20, 2026 |
| golang-race · RHEL 8 | 0:1.26.5-1.module+el8.10.0+24506+6809f2d9 | RHSA-2026:38995 | Jul 14, 2026 |
| golang-race · RHEL 9 | 0:1.26.5-1.el9_8 | RHSA-2026:37435 | Jul 11, 2026 |
| golang-race · almalinux 10 | 1.26.5-1.el10_2.alma.1 | ALSA-2026:37436 | Jul 9, 2026 |
| golang-race · almalinux 8 | 1.26.5-1.module_el8.10.0+4223+bd807c2e | ALSA-2026:38995 | Jul 13, 2026 |
| golang-race · almalinux 9 | 1.26.5-1.el9_8 | ALSA-2026:37435 | Jul 9, 2026 |
| golang-shared · amzn 2023 | 1.25.12-1.amzn2023.0.1 | ALAS2023-2026-1979 | Jul 20, 2026 |
| golang-src · RHEL 8 | 0:1.26.5-1.module+el8.10.0+24506+6809f2d9 | RHSA-2026:38995 | Jul 14, 2026 |
| golang-src · RHEL 9 | 0:1.26.5-1.el9_8 | RHSA-2026:37435 | Jul 11, 2026 |
| golang-src · almalinux 10 | 1.26.5-1.el10_2.alma.1 | ALSA-2026:37436 | Jul 9, 2026 |
| golang-src · almalinux 8 | 1.26.5-1.module_el8.10.0+4223+bd807c2e | ALSA-2026:38995 | Jul 13, 2026 |
| golang-src · almalinux 9 | 1.26.5-1.el9_8 | ALSA-2026:37435 | Jul 9, 2026 |
| golang-src · amzn 2023 | 1.25.12-1.amzn2023.0.1 | ALAS2023-2026-1979 | Jul 20, 2026 |
| golang-tests · RHEL 8 | 0:1.26.5-1.module+el8.10.0+24506+6809f2d9 | RHSA-2026:38995 | Jul 14, 2026 |
| golang-tests · RHEL 9 | 0:1.26.5-1.el9_8 | RHSA-2026:37435 | Jul 11, 2026 |
| golang-tests · almalinux 10 | 1.26.5-1.el10_2.alma.1 | ALSA-2026:37436 | Jul 9, 2026 |
| golang-tests · almalinux 8 | 1.26.5-1.module_el8.10.0+4223+bd807c2e | ALSA-2026:38995 | Jul 13, 2026 |
| golang-tests · almalinux 9 | 1.26.5-1.el9_8 | ALSA-2026:37435 | Jul 9, 2026 |
| golang-tests · amzn 2023 | 1.25.12-1.amzn2023.0.1 | ALAS2023-2026-1979 | Jul 20, 2026 |
| golist · amzn 2023 | 0.10.4-12.amzn2023.0.11 | ALAS2023-2026-1976 | Jul 20, 2026 |
| golist-debuginfo · amzn 2023 | 0.10.4-12.amzn2023.0.11 | ALAS2023-2026-1976 | Jul 20, 2026 |
| golist-debugsource · amzn 2023 | 0.10.4-12.amzn2023.0.11 | ALAS2023-2026-1976 | Jul 20, 2026 |
| govulncheck-vulndb · opensuse-leap 16.0 | 0.0.20260723T184607-160000.1.1 | OPENSUSE-SU-2026:21483-1 | Jul 30, 2026 |
| nerdctl · amzn 2023 | 2.3.5-1.amzn2023.0.1 | ALAS2023-2026-2129 | Aug 31, 2026 |
| oci-add-hooks · amzn 2023 | 0-0.1.20200504git268e3bb.amzn2023.0.12 | ALAS2023-2026-3206 | Nov 7, 2026 |
| oci-add-hooks-debuginfo · amzn 2023 | 0-0.1.20200504git268e3bb.amzn2023.0.12 | ALAS2023-2026-3206 | Nov 7, 2026 |
| oci-add-hooks-debugsource · amzn 2023 | 0-0.1.20200504git268e3bb.amzn2023.0.12 | ALAS2023-2026-3206 | Nov 7, 2026 |
| rclone · amzn 2023 | 1.75.1-1.amzn2023 | ALAS2023-2026-3129 | Sep 28, 2026 |
| rclone-debuginfo · amzn 2023 | 1.75.1-1.amzn2023 | ALAS2023-2026-3129 | Sep 28, 2026 |
| rclone-debugsource · amzn 2023 | 1.75.1-1.amzn2023 | ALAS2023-2026-3129 | Sep 28, 2026 |
| runc · amzn 2023 | 1.3.6-1.amzn2023.0.1 | ALAS2023-2026-2138 | Sep 14, 2026 |
| runc-debuginfo · amzn 2023 | 1.3.6-1.amzn2023.0.1 | ALAS2023-2026-2138 | Sep 14, 2026 |
| runc-debugsource · amzn 2023 | 1.3.6-1.amzn2023.0.1 | ALAS2023-2026-2138 | Sep 14, 2026 |
| runfinch-finch · amzn 2023 | 1.17.2-1.amzn2023.0.3 | ALAS2023-2026-2023 | Aug 3, 2026 |
| soci-snapshotter · amzn 2023 | 0.16.0-1.amzn2023.0.1 | ALAS2023-2026-3153 | Nov 7, 2026 |
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