Out-of-bounds Read in PHP
CVE-2026-93682
When the HTTP stream wrapper follows a redirect and the response carries a Location header with an empty value, the redirect code reads one byte past the end of the heap buffer holding the location. The value of that out-of-bounds byte decides which redirect target is built, so a malicious server controls whether the client is sent to the host root or to the current directory.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.003 (27.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 27.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.003 · change: -0.000
Affected products
Weakness classification (CWE)
References
- github.com/php/php-src/security/advisories/GHSA-7875-c8px-7q5f (Exploit, vendor-advisory, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-93682?
- CVE-2026-93682 is a medium-severity vulnerability in PHP, classified under Out-of-bounds Read. CVSS score: 5.8/10. Published 2026-09-25.
- How severe is CVE-2026-93682?
- Medium severity. CVSS v3 base score is 5.8 out of 10.