GHSA-v6x3-9r38-r27q — sequoia-openpgp
MEDIUMGHSA-v6x3-9r38-r27q is a medium-severity (CVSS 5.3) CWE-195 vulnerability in sequoia-openpgp. A fix is available for sequoia-openpgp — see the affected versions and patch details below.
Sequoia PGP has Subtraction Overflow when aes_key_unwrap function is provided ciphertext that is too short
Exploitation Status
No confirmed exploitation observed yet
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for GHSA-v6x3-9r38-r27q.
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
How urgent is this, really
GHSA-v6x3-9r38-r27q plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE doesn't sit, though severity or exploitability alone can still warrant action.
Where this sits among everything scored
Of 378,156 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
Real-World Exposure
sequoia-openpgpReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects crates.io packages — download data is not available via public APIs for these ecosystems.
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.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🦀crates.io | sequoia-openpgp | all versions | 2.1.0cargo update -p sequoia-openpgp --precise 2.1.0 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for sequoia-openpgp, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update sequoia-openpgp to 2.1.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-v6x3-9r38-r27q is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like GHSA-v6x3-9r38-r27q can be triaged on real exposure rather than presence alone.
Tailored to GHSA-v6x3-9r38-r27q. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-v6x3-9r38-r27q in your dependencies?
O3 Security finds GHSA-v6x3-9r38-r27q across crates.io dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.