5.3

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2025-67897

CVE-2025-67897: Sequoia PGP has Subtraction Overflow when aes_key_unwrap function is provided ciphertext that is too short

In Sequoia before 2.1.0, aes_key_unwrap panics if passed a ciphertext that is too short. A remote attacker can take advantage of this issue to crash an application by sending a victim an encrypted message with a crafted PKESK or SKESK packet.

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2025-67897

CVE-2025-67897:

5.3

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
sequoia-openpgp	rust	< 2.1.0	2.1.0

Technical Details

Vulnerability Intelligence
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Root Cause Analysis

The vulnerability lies in the aes_key_unwrap function within the sequoia-openpgp crate. The function is supposed to handle AES key unwrapping as specified in RFC 6637. However, it fails to properly validate the length of the input ciphertext before performing calculations on it. Specifically, the calculation let n = c.len() / 8 - 1; can lead to a subtraction overflow if the ciphertext is too short. c is a slice of the ciphertext starting from the 8th byte. If the total length of the ciphertext is less than 16 bytes, c.len() will be less than 8, causing the division to be 0 and the subtraction to underflow. This underflow results in a panic, which can be triggered remotely by sending a crafted encrypted message, leading to a denial of service. The patch for this vulnerability introduces a check to ensure the ciphertext is at least 16 bytes long, thus preventing the underflow.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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