CVE-2026-87735
Deferred Deferred - Pending Action

Mirage Crypto PK RSA Decryption Exception

Publication date: 2026-09-09

Last updated on: 2026-09-09

Assigner: MITRE

Description
An issue was discovered in the mirage-crypto-pk package before 2.3.0 for OCaml. There is an undocumented exception for a small message during RSA decryption or encryption.

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Meta Information

Published
2026-09-09
Last Modified
2026-09-09
Generated
2026-09-29
AI Q&A
2026-09-10
EPSS Evaluated
2026-09-27
NVD
CVE-2026-87735
EUVD
EUVD-2026-74621

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
mirage mirage-crypto-pk to 2.3.0 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-1284 The product receives input that is expected to specify a quantity (such as size or length), but it does not validate or incorrectly validates that the quantity has the required properties.

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Executive Summary

This vulnerability involves an undocumented exception in the mirage-crypto-pk package before version 2.3.0 for OCaml. It allows a small message to bypass proper RSA decryption or encryption, potentially leading to incorrect handling of encrypted data.

Detection Guidance

Detection requires checking the version of the mirage-crypto-pk package in OCaml environments. Use commands like 'opam list mirage-crypto-pk' or 'opam show mirage-crypto-pk' to verify if the installed version is below 2.3.0.

Impact Analysis

The impact includes potential data integrity issues during RSA operations. Attackers might exploit this to manipulate small messages, causing unexpected behavior in applications relying on this library for encryption or decryption.

Compliance Impact

The vulnerability in the mirage-crypto-pk package involves an undocumented exception during RSA decryption or encryption for small messages. This could potentially lead to improper handling of sensitive data, which may impact compliance with standards like GDPR or HIPAA if cryptographic operations are involved in processing personal or health information.

Mitigation Strategies

Upgrade the mirage-crypto-pk package to version 2.3.0 or later. Use 'opam update' followed by 'opam upgrade mirage-crypto-pk' to apply the fix.

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