CVE-2025-67897 Sequoia PGP has Subtraction Overflow when aes_key_unwrap function is provided ciphertext that is too short
A remote attacker can crash applications using the Sequoia PGP library by sending crafted encrypted messages with short ciphertexts.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2025-67897?
CVE-2025-67897 is a medium-severity denial of service vulnerability in sequoia-pgp sequoia, published on 14 Dec 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-195
Which versions are affected by CVE-2025-67897?
3 open source packages ship an affected version, including sequoia-openpgp.
| Package | Affected | Fixed in |
|---|---|---|
sequoia-openpgp crates.io | All versions | 2.1.0 |
sequoia-openpgp crates.io | All versions | 2.1.0 |
sequoia-openpgp crates.io | From 0.0.0-0 | 2.1.0 |
How do I fix CVE-2025-67897?
Upgrade sequoia-openpgp to 2.1.0 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2025-67897 being exploited?
There is no known exploitation of CVE-2025-67897 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2025-67897, GHSA-v6x3-9r38-r27q, RUSTSEC-2025-0136, UBUNTU-CVE-2025-67897.