Assessment
Why it matters
EPSS is 0.1%; technical severity is CVSS 5.4.
Circular symbolic links in phar archives could lead to unbounded recursion, exhausting the C stack and crashing the PHP process, in PHP versions from 8.2.* before 8.2.33, from 8.3.* before 8.3.33, from 8.4.* before 8.4.24, and from 8.5.* before 8.5.9.
Who should care
- Teams operating PHP
- Vulnerability and exposure management teams
- Security operations teams monitoring exploitation activity
Response plan
What I would do
- Confirm whether PHP is present in the environment.
- Identify affected versions and establish whether vulnerable services are exposed or reachable.
- Vendor advisory from github.com
- Review relevant security telemetry for evidence of attempted or successful exploitation.
- Document the remediation decision and track it to verified completion.
Treatment intelligence
Remediation intelligence
Vendor sources are listed before government and third-party guidance. Confirm product applicability and change prerequisites before deployment.
Verification noteAutomated link verification has not completed for this guidance yet.
Technical details
- CVSS vector
- CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- CWE
- CWE-121
- Affected versions
- PHP PHP (Start Including 8.2.0, End Excluding 8.2.33 | Start Including 8.3.0, End Excluding 8.3.33 | Start Including 8.4.0, End Excluding 8.4.24 | Start Including 8.5.0, End Excluding 8.5.9)
- Fixed versions
- PHP PHP (Fixed from 8.2.33, 8.3.33, 8.4.24, 8.5.9)
- Published
- 30 July 2026
- Attack vector
- Local
- Privileges required
- None
- User interaction
- Active
Signal timeline
- CVE published
- Latest EPSS score: 0.1%
- Signal calculated at 9