CryptoApplication · Golang
CVE-2026-39833
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedThe 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.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceThe in-memory keyring's NewKeyring() function silently accepted keys with the ConfirmBeforeUse security constraint but never enforced it, allowing cryptographic key operations to proceed without user confirmation while falsely indicating such protection was active. This represents a security control bypass where the constraint was accepted but ineffective.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data
CryptoApplication
< 0.52.0CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Check installed golang crypto versionRun 'go list -m all' or 'go get golang.org/x/crypto@latest' to see the currently installed version of the crypto moduleAffected if The version listed is below 0.52.0 (e.g., 0.51.0, 0.50.0, etc.)
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Find NewKeyring usage in codebaseSearch source code for occurrences of 'NewKeyring(' function calls, using grep or IDE search across .go filesAffected if Code calls NewKeyring() to create an in-memory keyring
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Identify ConfirmBeforeUse constraint usageSearch for 'ConfirmBeforeUse' in the same files or contexts where NewKeyring is called, look for keyring constraints being passed to NewKeyringAffected if The code passes ConfirmBeforeUse as a constraint option to NewKeyring()
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Verify error handling for constraint validationExamine how NewKeyring() return values are handled - check if errors are checked and if the constraint validation failure would be caughtAffected if The code does not check for errors from NewKeyring() or does not handle the case where ConfirmBeforeUse is rejected (in fixed versions)
You are affected if you use golang crypto version below 0.52.0 and your code relies on NewKeyring() with ConfirmBeforeUse constraint expecting user confirmation, because the constraint is silently ignored with no error or warning.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped0.52.0
Upgrade to the version containing the fix where NewKeyring() returns errors for unsupported constraints, then audit all code paths that request ConfirmBeforeUse to implement proper error handling or alternative confirmation mechanisms.
golang.org/x/crypto v0.52.0 or later
- Locate the go.mod file in your project that imports the crypto package
- Update the crypto package version to 0.52.0 or later in go.mod (e.g., golang.org/x/crypto v0.52.0)
- Run 'go mod tidy' to update dependencies and verify the upgrade
- Rebuild your application with 'go build ./...','Run tests to ensure the upgrade does not break existing functionality
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in Crypto
Scoped from the published advisory
- Consultation4.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,120.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-39833 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-39833 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Version or environment caveats, and links to real fixes
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