# CVE-2025-67897: RUSTSEC-2025-0136 - Underflow in aes_key_unwrap function

Source: https://junglewise.ai/threats/cve-2025-67897-sequoia-pgp-has-subtraction-overflow-when-aes-key-unwrap-function  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2025-12-14  
License: CC BY 4.0 with a link back

CVE-2025-67897 · Severity: medium · CVSS 5.3 · Published 2025-12-14

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.

Technologies: [sequoia-openpgp (crates.io)](https://junglewise.ai/threats/technologies/crates-io-sequoia-openpgp). Vendors: [crates.io](https://junglewise.ai/threats/vendors/crates-io).

## Quick answers

**Is CVE-2025-67897 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-67897 being exploited in the wild.

**How severe is CVE-2025-67897?** Medium severity, with a CVSS score of 5.3, published 14 December 2025.

**Which products and versions are affected?** sequoia-openpgp (crates.io) SEMVER:introduced=0,fixed=2.1.0, SEMVER:introduced=0.0.0-0,fixed=2.1.0.

**Is there a fix for CVE-2025-67897?** Yes. sequoia-openpgp (crates.io): upgrade to 2.1.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2025-67897?** Check whether you run sequoia-openpgp (crates.io) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- sequoia-openpgp (crates.io): upgrade to 2.1.0 or later

  ```sh
  cargo update -p sequoia-openpgp
  ```


## Affected products

- sequoia-openpgp (crates.io) SEMVER:introduced=0,fixed=2.1.0, SEMVER:introduced=0.0.0-0,fixed=2.1.0

## Identifiers

- CVE-2025-67897
- GHSA-v6x3-9r38-r27q
- RUSTSEC-2025-0136

## Related threats

- [Duplicate Advisory: sequoia-openpgp vulnerable to out-of-bounds array access leading to panic](https://junglewise.ai/threats/duplicate-advisory-sequoia-openpgp-vulnerable-to-out-of-bounds-array-ce1c8b7a)
- [Duplicate Advisory: Low severity (DoS) vulnerability in sequoia-openpgp](https://junglewise.ai/threats/duplicate-advisory-low-severity-dos-vulnerability-in-sequoia-openpgp-daec4f2a)
- [RUSTSEC-2024-0345 - Low severity (DoS) vulnerability in sequoia-openpgp](https://junglewise.ai/threats/cve-2024-58261-low-severity-dos-vulnerability-in-sequoia-openpgp)
- [RUSTSEC-2023-0038 - Out-of-bounds array access leads to panic](https://junglewise.ai/threats/cve-2023-53160-sequoia-openpgp-vulnerable-to-out-of-bounds-array-access-leading)