Composer is a dependency Manager for the PHP language. Prior to 2.2.29 and 2.10.2, a maliciously crafted package from an untrusted repository other than Packagist.org or Private Packagist can cause Composer to write attacker-controlled files outside the vendor directory and outside the project during install or update by using an invalid package name that is not correctly validated before dependency-resolution results are written or installed. This issue is fixed in versions 2.2.29 and 2.10.2.
CVE-2026-59948
HIGHPre-NVD 7.07.0
EchelonGraph scoreLOW confidence
This high-severity CVE scores 7.0 under the CNA's CVSS (NVD's own analysis pending). EPSS exploit-prediction score not yet available (the EPSS model rescores nightly; freshly-published CVEs typically appear within 48 hours). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: cna:github_m
7.0
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: —CVSS: 7.0Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 7.0
- EG Score
- 7.0(low)
- EPSS
- —
- KEV
- Not listed
Published
July 8, 2026
Last Modified
July 8, 2026
Advisory Details (5)
Auto-updated Jul 8, 2026Patch available. Sources: github_commit, github_release, github.
github Patch Available
Arbitrary file write outside vendor via malicious transitive package name · Advisory · composer/composer · GitHub
https://github.com/composer/composer/security/advisories/GHSA-499r-g7pc-vmp9github_release Patch Available
2.2.29
Patch available: composer/composer 2.2.29
https://github.com/composer/composer/releases/tag/2.2.29github_release Patch Available
2.10.2
Patch available: composer/composer 2.10.2
https://github.com/composer/composer/releases/tag/2.10.2github_commit Patch Available
commit c50b1efd13eb (composer/composer)
Patch available: composer/composer 2.2.29 (contains commit c50b1efd13eb)
https://github.com/composer/composer/commit/c50b1efd13ebd73f6dca19b31424c5a02bf93cc1github_commit Patch Available
commit 502c6c4f6998 (composer/composer)
Patch available: composer/composer 2.10.2 (contains commit 502c6c4f6998)
https://github.com/composer/composer/commit/502c6c4f699802d9cf464728b3e8a95674f919a0Weakness Classification(2)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 2× in last 7d / 2× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-07-08 19:46 UTCEG score recompute
- 2026-07-08 19:44 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
Same CWE
10 shownCWE-22 · CWE-787
Frequently asked(4)
What is CVE-2026-59948?
CVE-2026-59948 is a high vulnerability published on July 8, 2026. Composer is a dependency Manager for the PHP language. Prior to 2.2.29 and 2.10.2, a maliciously crafted package from an untrusted repository other than Packagist.org or Private Packagist can cause Composer to write attacker-controlled files outside the vendor directory and outside the project…
When was CVE-2026-59948 disclosed?
CVE-2026-59948 was first published in the National Vulnerability Database on July 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-59948?
CVE-2026-59948 has a CVSS v3 base score of 7.0 (NVD). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2026-59948?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-59948, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-59948
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