CVE-2026-26157: busybox External Control of File Name or Path
Vulnerability summary
CVE-2026-26157 is a high (CVSS 7.0) External Control of File Name or Path vulnerability in busybox. EPSS estimates a 0.69% chance of exploitation in the next 30 days, higher than 51.9% of scored vulnerabilities. 1 public exploit is recorded.
Advisory lineage
Upstream 0 · Downstream 7 · Related 7Timeline
- 11-02-2026PublishedVulnerability first disclosed.
- 15-07-2026Last modifiedVulnerability information updated.
Description
A flaw was found in BusyBox. Incomplete path sanitization in its archive extraction utilities allows an attacker to craft malicious archives that when extracted, and under specific conditions, may write to files outside the intended directory. This can lead to arbitrary file overwrite, potentially enabling code execution through the modification of sensitive system files.
CVSS metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated7.0HighCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.0HighCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
- NVDNIST7.0HighCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.69%
Chance of exploitation in the next 30 days
Percentile
52%
Versus all other CVEs
30-day change
-0.02 pp
From 0.71% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundBusyBox 1.37.0 - Path Traversal
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Chainguard1 product
- busybox< 1.37.0-r58
Debian1 product
- busyboxAll versions (No fix recorded) | < 1:1.37.0-10.1
Opensuse1 product
- busybox&distro=openSUSE Tumbleweed< 1.37.0-10.1
Ubuntu1 product
- busyboxAll versions (No fix recorded)
Wolfi1 product
- busybox< 1.37.0-r58
5 vendors · 5 products
