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VulnerabilityPublished Updated

CVE-2026-39833: Golang go.crypto · The in-memory keyring returned by NewKeyring() silently accepted keys with the

Affects golang-go.cryptoSource GCVE Database

0
Authoritative record:CVE-2026-39833· Critical 9.1

Not known to be exploited · CVSS 9.1 Critical · fixed in 1:0.0~git20151201.0.7b85b09-2ubuntu0.1~esm2 : patch golang-go.crypto as a priority.

Data as of 26 Oct 2026, 14:05 UTC

CVSS 3.1 base score
9.1Critical
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.4% chance of exploitation in 30 days – higher than 40% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 1:0.0~git20151201.0.7b85b09-2ubuntu0.1~esm2, 2.0.11-0ubuntu1~16.04.4+esm3, 3.0.3-0ubuntu1~18.04.2+esm3 +5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 22 May 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
Ubuntu 26.10snapdpkg:deb/ubuntu/snapd?arch=source&distro=stonkingOther threatsAffected
  • 2.74.1+ubuntu26.04.4 – 2.77.1+ubuntu26.10.1
5 affected builds
Fixed in–
Ubuntu 26.04 LTSsnapdpkg:deb/ubuntu/snapd?arch=source&distro=resoluteOther threatsAffected
  • 2.71.1+ubuntu25.10.1 – 2.77.1+ubuntu26.04.2
12 affected builds
Fixed in–
Ubuntu Pro 26.04 LTSgolang-go.cryptopkg:deb/ubuntu/golang-go.crypto?arch=source&distro=esm-apps/resoluteOther threatsAffected
  • <1:0.47.0-1ubuntu0.1~esm1
Fixed in
  • 1:0.47.0-1ubuntu0.1~esm1
Ubuntu 25.10golang-go.cryptopkg:deb/ubuntu/golang-go.crypto?arch=source&distro=questingOther threatsAffected
  • =1:0.25.0-1
  • =1:0.25.0-1ubuntu0.1
Fixed in–
Ubuntu 25.10snapdpkg:deb/ubuntu/snapd?arch=source&distro=questingOther threatsAffected
  • 2.67.1+25.04 – 2.75.2+ubuntu25.10
9 affected builds
Fixed in–
Ubuntu 24.04 LTSsnapdpkg:deb/ubuntu/snapd?arch=source&distro=nobleOther threatsAffected
  • 2.60.4+23.10 – 2.77.1+ubuntu24.04
21 affected builds
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

Description

The in-memory keyring returned by NewKeyring() silently accepted keys with the ConfirmBeforeUse constraint but never enforced it. The key would sign without any confirmation prompt, with no indication to the caller that the constraint was not in effect. NewKeyring() now returns an error when unsupported constraints are requested.

References

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