CVE-2026-59946: composer Path Traversal
Vulnerability summary
CVE-2026-59946 is a medium (CVSS 6.1) Path Traversal vulnerability in composer. EPSS estimates a 0.17% chance of exploitation in the next 30 days, higher than 6.2% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 7 · Related 7Timeline
- 08-07-2026PublishedVulnerability first disclosed.
- 09-07-2026Last modifiedVulnerability information updated.
Description
Composer is a dependency Manager for the PHP language. Prior to 2.2.29 and 2.10.2, a Composer package bin entry containing .. path segments can resolve outside the package install directory and cause Composer's binary installation flow to chmod an existing host file to a world-readable and world-executable mode during composer install, update, or require. This issue is fixed in versions 2.2.29 and 2.10.2.
CVSS metrics
5 scores · 5 sources · 1 version- OSV · Red hatEcosystem advisory · calculated5.6MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:NDiffers
- OSV · UbuntuEcosystem advisory · calculated6.1MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
- OSV · DebianEcosystem advisory · calculated6.1MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
- NVDNIST6.1MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
EPSS trend
Probability
0.17%
Chance of exploitation in the next 30 days
Percentile
6%
Versus all other CVEs
30-day change
0.00 pp
From 0.17% on 20-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.
- CWE-732Incorrect Permission Assignment for Critical ResourceThe product specifies permissions for a security-critical resource in a way that allows that resource to be read or modified by unintended actors.
Affected systems
Composer1 product
- composer≥ 1.0, < 2.2.29 | ≥ 2.3.0, < 2.10.2
Debian1 product
- composerAll versions (No fix recorded) | < 2.10.2-1
Redhat1 product
- composer< 0:2.10.2-1.hum1
Ubuntu1 product
- composerAll versions (No fix recorded)
4 vendors · 4 products
References
15 links- github.com/composer/composer/security/advisories/GHSA-gjfg-22fp-rrxxX Refsource CONFIRMARTICLEREPORT
- images.redhat.comARTICLE
