Improper Verification of Cryptographic Signature Affecting openpgp package, versions >=5.0.1 <5.11.3>=6.0.0-alpha.0 <6.1.1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-OPENPGP-10185678
- published20 May 2025
- disclosed19 May 2025
- creditEdoardo Geraci, Thomas Rinsma
Introduced: 19 May 2025
NewCVE-2025-47934 (opens in a new tab)How to fix?
Upgrade openpgp to version 5.11.3, 6.1.1 or higher.
Overview
openpgp is a JavaScript implementation of the OpenPGP protocol.
Affected versions of this package are vulnerable to Improper Verification of Cryptographic Signature through the openpgp.verify or openpgp.decrypt functions. An attacker can manipulate the message content to appear as legitimately signed by constructing a message with any data of their choice, using a valid signature from a different message.
Note:
This is only exploitable if the attacker has access to a valid signature and the plaintext data that was legitimately signed.
Workaround
This vulnerability can be mitigated by extracting the message and signatures from the message returned by openpgp.readMessage, and verifying each signature as a detached signature by passing the signature and a new message containing only the data (created using openpgp.createMessage) to openpgp.verify. For signed+encrypted messages, decrypt and verify the message in two steps, by first calling openpgp.decrypt without verificationKeys, and then passing the returned signature(s) and a new message containing the decrypted data (created using openpgp.createMessage) to openpgp.verify.