CVE-2025-3757
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 · uneditedVersions of OpenPubkey library prior to 0.10.0 contained a vulnerability that would allow a specially crafted JWS to bypass signature verification.
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 · high confidenceThe OpenPubkey library versions before 0.10.0 contain a signature verification bypass vulnerability where specially crafted JWS (JSON Web Signature) tokens can bypass the cryptographic signature validation, allowing attackers to forge tokens and potentially authenticate as any user or service.
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< 0.10.0CVSS 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
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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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Identify OpenPubkey installationLocate the OpenPubkey library in your environment by searching for openpubkey packages or modules (e.g., via package manager, dependency files, or installed libraries)Affected if OpenPubkey library is present in your environment
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Determine installed OpenPubkey versionQuery the installed version of the OpenPubkey library using your package manager (e.g., pip show, npm list, or similar) or inspect version metadata in your dependency configurationAffected if The installed version is below 0.10.0 (e.g., 0.9.x, 0.8.x, etc.)
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Verify JWS token processing is in useInspect your application code and configuration for usage of JWS (JSON Web Signature) token creation, parsing, or verification functions provided by OpenPubkeyAffected if Your application processes or validates JWS tokens using OpenPubkey
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Check signature verification configurationReview your OpenPubkey configuration to confirm that signature verification is enabled for token validation (look for verify, validate, or signature-related flags)Affected if Signature verification is enabled and you are using a version below 0.10.0
You are affected if OpenPubkey library below version 0.10.0 is installed and your application uses OpenPubkey to process JWS tokens with signature verification enabled.
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 · scoped0.10.0
Upgrade OpenPubkey library to version 0.10.0 or later to remediate this vulnerability.
0.10.0
- Update the OpenPubkey library to version 0.10.0 or later using your package manager (e.g., pip install openpubkey>=0.10.0 or npm install openpubkey@^0.10.0)
- After upgrading, verify that JWS signature verification is working correctly in your implementation
- Test that the previously vulnerable code paths now properly validate signatures
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation8.0 h
- Testing12.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $7,616.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-3757 — 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-2025-3757 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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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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