CVE•Published 2026-03-19•Modified 2026-05-03•0 articles on news•5 live references•NVD data

CVE-2026-4426Libarchive · Libarchive

Vulnerability data via NVD (ingested)

CVSS v3.1

6.5

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

EPSS percentile

Exploit Prediction Scoring System · top 69% of all CVEs

Weaknesses (CWE)

CWE-1335Incorrect Bitwise Shift of Integer

Description

A flaw was found in libarchive. An Undefined Behavior vulnerability exists in the zisofs decompression logic, caused by improper validation of a field (`pz_log2_bs`) read from ISO9660 Rock Ridge extensions. A remote attacker can exploit this by supplying a specially crafted ISO file. This can lead to incorrect memory allocation and potential application crashes, resulting in a denial-of-service (DoS) condition.

Timeline

Published 2026-03-19

Modified 2026-05-03

External references

NVD MITRE Exploit-DB GitHub PoC VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2026-4426

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Libarchive Libarchive"

All exposed Libarchive Libarchive instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Libarchive"

HTTP body or banner mentions "Libarchive" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-4426