How severe is GHSA-mhpq-9638-x6pw?

GHSA-mhpq-9638-x6pw has a CVSS score of 5.3/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by GHSA-mhpq-9638-x6pw?

GHSA-mhpq-9638-x6pw affects the following packages: github.com/dvsekhvalnov/jose2go (Go). Ecosystems affected: Go.

How do I fix GHSA-mhpq-9638-x6pw?

Update github.com/dvsekhvalnov/jose2go to 1.5.1-0.20231206184617-48ba0b76bc88 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-mhpq-9638-x6pw is resolved across your whole dependency graph.

How do I detect GHSA-mhpq-9638-x6pw in my Go dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/dvsekhvalnov/jose2go. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.

How do I mitigate GHSA-mhpq-9638-x6pw if there is no patch (or I can't update yet)?

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 does O3 Security protect against GHSA-mhpq-9638-x6pw?

O3 pinpoints whether GHSA-mhpq-9638-x6pw is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Is GHSA-mhpq-9638-x6pw actively exploited in the wild?

No public exploit code has been indexed for GHSA-mhpq-9638-x6pw yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for GHSA-mhpq-9638-x6pw?

GHSA-mhpq-9638-x6pw has an EPSS (Exploit Prediction Scoring System) score of 0.8%, placing it in the 53th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

When was GHSA-mhpq-9638-x6pw published, and has it been updated?

GHSA-mhpq-9638-x6pw was published on December 20, 2023 and was last updated on February 4, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

Withdrawn — this advisory has been retracted

🐹 Go

GHSA-mhpq-9638-x6pw

MEDIUM

Duplicate Advisory: Denial of service when decrypting attack controlled input in github.com/dvsekhvalnov/jose2go

Also known asCVE-2023-50658 GHSA-6294-6rgp-fr7rGO-2023-2409

Published

Dec 20, 2023

Updated

Feb 4, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

EPSS Exploitation Probability

via FIRST.org ↗

0.8%probability of exploitation in next 30 days

Lower Risk53th percentile+0.77%

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.

Blast Radius

1 pkg affected

🐹github.com/dvsekhvalnov/jose2go

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

Description

Duplicate Advisory

This advisory has been withdrawn because it is a duplicate of GHSA-6294-6rgp-fr7r. This link is maintained to preserve external references.

Original Description

An attacker controlled input of a PBES2 encrypted JWE blob can have a very large p2c value that, when decrypted, produces a denial-of-service.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐹Go	`github.com/dvsekhvalnov/jose2go`	all versions	1.5.1-0.20231206184617-48ba0b76bc88

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/dvsekhvalnov/jose2go. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update github.com/dvsekhvalnov/jose2go to 1.5.1-0.20231206184617-48ba0b76bc88 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-mhpq-9638-x6pw 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 pinpoints whether GHSA-mhpq-9638-x6pw is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Tailored to GHSA-mhpq-9638-x6pw. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

## Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-6294-6rgp-fr7r. This link is maintained to preserve external references. ## Original Description An attacker controlled input of a PBES2 encrypted JWE blob can have a very large p2c value that, when decrypted, produces a denial-of-service.

O3 Security · Impact-Aware SCA

Is GHSA-mhpq-9638-x6pw in your dependencies?

O3 detects GHSA-mhpq-9638-x6pw across Go dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

Scan my dependencies How O3 SCA works