synced 9 MIN AGO
01 Record

CVE-2026-42505

Invoking Encrypted Client Hello privacy leak in crypto/tls

MediumPUBLISHEDCNA: Go
CNA base score5.3 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
View raw JSON

02 Description

Invoking Encrypted Client Hello privacy leak in crypto/tls

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.38% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 31.9% of scored records. A rank, not a probability.
NVD base score
5.3 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
NVD analysis status
Analyzed. NVD last modified this record on 2026-10-25.
Red Hat severity
Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2026-07-08 15:46Z3 MO AGO
Last updated
2026-07-08 19:38Z3 MO AGO
Reserved
2026-04-28
Assigning CNA
Go
Record state
PUBLISHED
Severity
Medium (CVSS 5.3)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Weaknesses
  • CWE-201Insertion of Sensitive Information Into Sent DataBase
Data version
5.2
Document digest
87b96109e0610425d8b23e64bdebba9cada5fefb733f3f7cea885dabc3426893

05 Affected products

VendorProductVersionsPlatforms
Go standard librarycrypto/tls0 to < 1.25.12, 1.26.0-0 to < 1.26.5, 1.27.0-0 to < 1.27.0-rc.2—

06 References

07 Fixed in

AlmaLinux 8

  • delve
    Fixed in 1.26.1-1.module_el8.10.0+4223+bd807c2e
  • go-toolset
    Fixed in 1.26.5-1.module_el8.10.0+4223+bd807c2e
  • golang
    Fixed in 1.26.5-1.module_el8.10.0+4223+bd807c2e
  • golang-bin
    Fixed in 1.26.5-1.module_el8.10.0+4223+bd807c2e
  • golang-docs
    Fixed in 1.26.5-1.module_el8.10.0+4223+bd807c2e
  • golang-misc
    Fixed in 1.26.5-1.module_el8.10.0+4223+bd807c2e
  • golang-race
    Fixed in 1.26.5-1.module_el8.10.0+4223+bd807c2e
  • golang-src
    Fixed in 1.26.5-1.module_el8.10.0+4223+bd807c2e
  • golang-tests
    Fixed in 1.26.5-1.module_el8.10.0+4223+bd807c2e

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

AlmaLinux 9

  • git-lfs
    Fixed in 3.7.1-4.el9_8.3
  • go-toolset
    Fixed in 1.26.5-1.el9_8
  • golang
    Fixed in 1.26.5-1.el9_8
  • golang-bin
    Fixed in 1.26.5-1.el9_8
  • golang-docs
    Fixed in 1.26.5-1.el9_8
  • golang-misc
    Fixed in 1.26.5-1.el9_8
  • golang-race
    Fixed in 1.26.5-1.el9_8
  • golang-src
    Fixed in 1.26.5-1.el9_8
  • golang-tests
    Fixed in 1.26.5-1.el9_8

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

AlmaLinux 10

  • go-toolset
    Fixed in 1.26.5-1.el10_2.alma.1
  • golang
    Fixed in 1.26.5-1.el10_2.alma.1
  • golang-bin
    Fixed in 1.26.5-1.el10_2.alma.1
  • golang-docs
    Fixed in 1.26.5-1.el10_2.alma.1
  • golang-misc
    Fixed in 1.26.5-1.el10_2.alma.1
  • golang-race
    Fixed in 1.26.5-1.el10_2.alma.1
  • golang-src
    Fixed in 1.26.5-1.el10_2.alma.1
  • golang-tests
    Fixed in 1.26.5-1.el10_2.alma.1

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 8

  • delve
    Fixed in 1.26.1-1.module_el8.10.0+4223+bd807c2e
  • go-toolset
    Fixed in 1.26.5-1.module_el8.10.0+4223+bd807c2e
  • golang
    Fixed in 1.26.5-1.module_el8.10.0+4223+bd807c2e
  • golang-bin
    Fixed in 1.26.5-1.module_el8.10.0+4223+bd807c2e
  • golang-docs
    Fixed in 1.26.5-1.module_el8.10.0+4223+bd807c2e
  • golang-misc
    Fixed in 1.26.5-1.module_el8.10.0+4223+bd807c2e
  • golang-race
    Fixed in 1.26.5-1.module_el8.10.0+4223+bd807c2e
  • golang-src
    Fixed in 1.26.5-1.module_el8.10.0+4223+bd807c2e
  • golang-tests
    Fixed in 1.26.5-1.module_el8.10.0+4223+bd807c2e

Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 9

  • git-lfs
    Fixed in 3.7.1-4.el9_8.3
  • go-toolset
    Fixed in 1.26.5-1.el9_8
  • golang
    Fixed in 1.26.5-1.el9_8
  • golang-bin
    Fixed in 1.26.5-1.el9_8
  • golang-docs
    Fixed in 1.26.5-1.el9_8
  • golang-misc
    Fixed in 1.26.5-1.el9_8
  • golang-race
    Fixed in 1.26.5-1.el9_8
  • golang-src
    Fixed in 1.26.5-1.el9_8
  • golang-tests
    Fixed in 1.26.5-1.el9_8

Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 10

  • go-toolset
    Fixed in 1.26.5-1.el10_2.alma.1
  • golang
    Fixed in 1.26.5-1.el10_2.alma.1
  • golang-bin
    Fixed in 1.26.5-1.el10_2.alma.1
  • golang-docs
    Fixed in 1.26.5-1.el10_2.alma.1
  • golang-misc
    Fixed in 1.26.5-1.el10_2.alma.1
  • golang-race
    Fixed in 1.26.5-1.el10_2.alma.1
  • golang-src
    Fixed in 1.26.5-1.el10_2.alma.1
  • golang-tests
    Fixed in 1.26.5-1.el10_2.alma.1

Derived from AlmaLinux 10. Partial coverage: only packages taken from AlmaLinux 10 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

  • golang-1.24
    No fix yet

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

  • golang-1.26
    Fixed in 1.26.5-1
  • golang-1.27
    Fixed in 1.27~rc2-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 14.04 LTS

  • golang-1.10
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 16.04 LTS

  • golang-1.10
    No fix yet
  • golang-1.6
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 18.04 LTS

  • golang-1.10
    No fix yet
  • golang-1.8
    No fix yet
  • golang-1.9
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 20.04 LTS

  • golang-1.13
    No fix yet
  • golang-1.14
    No fix yet
  • golang-1.18
    No fix yet
  • golang-1.20
    No fix yet
  • golang-1.21
    No fix yet
  • golang-1.22
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 22.04 LTS

  • golang-1.17
    No fix yet
  • golang-1.18
    No fix yet
  • golang-1.20
    No fix yet
  • golang-1.21
    No fix yet
  • golang-1.22
    No fix yet
  • golang-1.23
    No fix yet
  • golang-1.24
    No fix yet
  • golang-1.25
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 24.04 LTS

  • golang-1.21
    No fix yet
  • golang-1.22
    No fix yet
  • golang-1.23
    No fix yet
  • golang-1.24
    No fix yet
  • golang-1.25
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 25.10

  • golang-1.23
    No fix yet
  • golang-1.24
    No fix yet
  • golang-1.25
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 26.04 LTS

  • golang-1.23
    No fix yet
  • golang-1.24
    No fix yet
  • golang-1.25
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 16.04 LTS

  • golang-1.13
    No fix yet
  • golang-1.18
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 18.04 LTS

  • golang-1.13
    No fix yet
  • golang-1.16
    No fix yet
  • golang-1.18
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 20.04 LTS

  • golang-1.16
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 22.04 LTS

  • golang-1.13
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.