What is CVE-2023-42444?

CVE-2023-42444 is a high-severity vulnerability in Whisperfish Phonenumber, classified under CWE-248. CVSS score: 8.6/10. Published 2023-09-19.

How severe is CVE-2023-42444?

High severity. CVSS v3 base score is 8.6 out of 10.

Vulnerability in Whisperfish Phonenumber

CVE-2023-42444

phonenumber is a library for parsing, formatting and validating international phone numbers. Prior to versions `0.3.3+8.13.9` and `0.2.5+8.11.3`, the phonenumber parsing code may panic due to a panic-guarded out-of-bounds access on the phonenumber string. In a typical deployment of `rust-phonenumber`, this may get triggered by feeding a maliciously crafted phonenumber over the network, specifically the string `.;phone-context=`. Versions `0.3.3+8.13.9` and `0.2.5+8.11.3` contain a patch for this issue. There are no known workarounds.

Published 2023-09-19 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.009 (58.0th percentile), scored 2026-10-19.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 58.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.009 · change: +0.002

Affected products

Whisperfish Phonenumber
Whisperfish Rust-Phonenumber — versions < 0.2.5+8.11.3, >= 0.3.0, < 0.3.3+8.3.19

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2023-42444?: CVE-2023-42444 is a high-severity vulnerability in Whisperfish Phonenumber, classified under CWE-248. CVSS score: 8.6/10. Published 2023-09-19.
How severe is CVE-2023-42444?: High severity. CVSS v3 base score is 8.6 out of 10.