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🛡️ CVE-2026-42505 on Ubuntu — golang-1.10

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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.

Distribution advisory

This page covers CVE-2026-42505 as tracked by Ubuntu, for the package golang-1.10. No fixed version has been recorded for this distribution yet.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality low, integrity none, availability none.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: None — an unauthenticated stranger can try it.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: Low — limited, and the attacker does not choose what is affected.
  • Integrity impact: None.
  • Availability impact: None.

Weakness class

UBUNTU-CVE-2026-42505 is classified as CWE-201: Insertion of Sensitive Information Into Sent Data. The code transmits data to another actor, but a portion of the data includes sensitive information that should not be accessible to that actor.

Affected software

UBUNTU-CVE-2026-42505 is recorded against 15 packages.

  • golang-1.10
  • golang-1.13
  • golang-1.14
  • golang-1.16
  • golang-1.17
  • golang-1.18
  • golang-1.20
  • golang-1.21
  • golang-1.22
  • golang-1.23
  • golang-1.24
  • golang-1.25
  • golang-1.6
  • golang-1.8
  • golang-1.9

Timeline and source

Published on 8 July 2026 and last revised on 15 July 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

ubuntu.com (Report)
www.cve.org (Report)
groups.google.com (Report)
github.com (Report)

Other advisories for this package

golang-1.10 has other advisories on record. If you are patching this one, these are worth checking on the same host:

Same weakness in other software

These advisories are the same class of weakness (CWE-201: Insertion of Sensitive Information Into Sent Data) in other software:

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2026-07-08
Updated 2026-08-20
Modified 2026-07-15
Fix URL N/A

Affected Packages

Software From version Fixed in
golang-1.10 — —
golang-1.13 — —
golang-1.14 — —
golang-1.16 — —
golang-1.17 — —
golang-1.18 — —
golang-1.20 — —
golang-1.21 — —
golang-1.22 — —
golang-1.23 — —
golang-1.24 — —
golang-1.25 — —
golang-1.6 — —
golang-1.8 — —
golang-1.9 — —

Vulnerability Monitoring

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