GHSA-fmjh-f678-cv3x is a medium-severity (CVSS 5.3) CWE-1286 vulnerability in github.com/nyaruka/phonenumbers. A fix is available for github.com/nyaruka/phonenumbers — see the affected versions and patch details below.
github.com/nyaruka/phonenumbers Vulnerable to Improper Validation of Syntactic Correctness of Input
Exploitation Status
Proof-of-concept exploit code exists
- CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
Exploitation and automatability from CISA’s SSVC triage for GHSA-fmjh-f678-cv3x.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
GHSA-fmjh-f678-cv3x by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.
Where this sits among everything scored
Of 379,842 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.
Real-World Exposure
github.com/nyaruka/phonenumbersReal-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
Versions of the package github.com/nyaruka/phonenumbers before 1.2.2 are vulnerable to Improper Validation of Syntactic Correctness of Input in the phonenumbers.Parse() function. An attacker can cause a panic by providing crafted input causing a "runtime error: slice bounds out of range".
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐹Go | github.com/nyaruka/phonenumbers | all versions | 1.2.2go get github.com/nyaruka/phonenumbers@v1.2.2 |
Affected Products
phonenumberstextitDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/nyaruka/phonenumbers, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update github.com/nyaruka/phonenumbers to 1.2.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-fmjh-f678-cv3x 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.
Frequently Asked Questions
Is GHSA-fmjh-f678-cv3x in your dependencies?
Find it across Go, including transitive dependencies.