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HIGH severity

GHSA-jp4j-47f9-2vc3

HIGHFix: nats-io/nats-server#1053

GHSA-jp4j-47f9-2vc3 is a high-severity (CVSS 7.5) CWE-190 vulnerability in github.com/nats-io/nats-server/v2. O3 Security confirms whether GHSA-jp4j-47f9-2vc3 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.

Integer Overflow or Wraparound in NATS Server

Also known asCVE-2019-13126GO-2022-0852
Published
May 18, 2021
Updated
Feb 4, 2026
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Feb 4, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected
🐹github.com/nats-io/nats-server/v2

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

An integer overflow in NATS Server before 2.2.0 allows a remote attacker to crash the server by sending a crafted request.

Specific Go Packages Affected

github.com/nats-io/nats-server/v2/server

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐹Gogithub.com/nats-io/nats-server/v2all versions2.2.0

Detection & mitigation playbook

Open-source dependency
  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/nats-io/nats-server/v2. 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.

  2. Fix

    Update github.com/nats-io/nats-server/v2 to 2.2.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-jp4j-47f9-2vc3 is resolved across your whole dependency graph.

  3. 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.

  4. How O3 protects you

    O3 pinpoints whether GHSA-jp4j-47f9-2vc3 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-jp4j-47f9-2vc3. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

An integer overflow in NATS Server before 2.2.0 allows a remote attacker to crash the server by sending a crafted request. ### Specific Go Packages Affected github.com/nats-io/nats-server/v2/server
O3 Security · Impact-Aware SCA

Is GHSA-jp4j-47f9-2vc3 in your dependencies?

O3 detects GHSA-jp4j-47f9-2vc3 across Go dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

GHSA-jp4j-47f9-2vc3: Integer Overflow or… | O3 Security