CVE-2026-65954

HIGHPre-NVD 8.68.6
EchelonGraph scoreLOW confidence

This high-severity CVE scores 8.6 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
8.6EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: —CVSS: 8.6Exploit: None knownExposed services: Not assessed

No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.

PHPCSUtils: Remote code execution via eval() in AbstractArrayDeclarationSniff::getActualArrayKey()

Impact

PHPCSUtils versions 1.0.0-alpha1 through 1.2.2 contain an arbitrary code execution vulnerability in PHPCSUtils\AbstractSniffs\AbstractArrayDeclarationSniff::getActualArrayKey(). The vulnerable method is reached by any sniff that extends AbstractArrayDeclarationSniff and calls getActualArrayKey().

Running PHPCS over untrusted PHP code through such a sniff, for example, in a CI pipeline that lints pull requests, or on a developer machine reviewing third-party code, could lead to arbitrary command execution on the scanning host.

The vulnerability happens when the method determines the value of an array key using eval(). A maliciously crafted array key such as 'system'('id') would be executed when the code was scanned.

Known attack vectors

Known code paths that reach the vulnerable method include the following PHPCSExtra sniffs:

  • Universal.Arrays.DuplicateArrayKey
  • Universal.Arrays.MixedArrayKeyTypes

Other packages that call AbstractArrayDeclarationSniff::getActualArrayKey() may also be vulnerable.

Patches

This issue has been fixed in PHPCSUtils 1.2.3. We recommend all users upgrade to 1.2.3 or later.

Workaround

Users who cannot upgrade immediately can disable the sniffs that reach the vulnerable method by adding ` tags to their custom ruleset (replace the placeholder standard and sniff names with the ones used in your setup):

For example, to disable the two PHPCSExtra sniffs listed under "Known attack vectors":

To verify that the sniffs have been disabled, run PHPCS with the -e` flag, which lists all the sniffs a standard will run. The excluded sniffs should no longer appear in the output:

phpcs -e --standard=/path/to/ruleset.xml

Credits

Many thanks to @rodrigoprimo for responsibly disclosing this vulnerability.

How can I report a security bug?

Please report security vulnerabilities privately via the "Security and quality" tab on the PHPCSUtils repository.

CVSS v3
8.6
EG Score
8.6HIGHlow confidence
EG Risk
43
EG Risk 43/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity86% × 45%
Exploitation0% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
—
EPSS %ILE
—
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track or Attend at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 29, 2026

Last Modified

September 29, 2026

Vendor Advisories for CVE-2026-65954(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
Packagist(1)
PackageVulnerable rangeFix by version rangeDependents
phpcsstandards/phpcsutils1.0.0 ... 1.2.2 (25 versions)
  • 1.0.0-alpha1 up to 1.2.3: fixed in 1.2.3
—

Data Freshness Timeline

(refreshed 1× in last 7d / 1× 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.

  1. 2026-09-29 18:23 UTCEG score recompute

Frequently asked(4)

What is CVE-2026-65954?
CVE-2026-65954 is a high vulnerability published on September 29, 2026. PHPCSUtils: Remote code execution via eval() in AbstractArrayDeclarationSniff::getActualArrayKey() Impact PHPCSUtils versions 1.0.0-alpha1 through 1.2.2 contain an arbitrary code execution vulnerability in PHPCSUtils\AbstractSniffs\AbstractArrayDeclarationSniff::getActualArrayKey(). The vulnerable…
When was CVE-2026-65954 disclosed?
CVE-2026-65954 was first published on September 29, 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-2026-65954?
CVE-2026-65954 has a CVSS base score of 8.6 (the CNA's own assessment, by github_m; NVD's own analysis pending). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2026-65954?
No fix for CVE-2026-65954 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-65954 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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