Description
In Vinyl Cache before 9.0,2, workspace buffer overflow vulnerability was found in the .upper() and .lower() string type methods of VCL. This can be used as a remote denial of service (DoS) vector to make the child process segfault or assert, and then restart. Effectively exploiting this vulnerability requires prior knowledge about the VCL in use and the ability to craft a request that contains a string that is long enough to fill the remaining workspace at the call site while staying under the different request size limits (http_req_size, http_req_hdr_len, etc.).
Published: 2026-09-18
Score: 2.3 Low
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

Vendor Solution

Update to unaffected Version

Vendor Workaround

replace the .upper() and .lower() VCL type method calls by their respective vmod_std counterparts: std.toupper() and std.tolower().

Tracking

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Advisories

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History

Sat, 19 Sep 2026 17:00:00 +0000

Type Values Removed Values Added
Title Workspace Buffer Overflow in Vinyl Cache .upper() and .lower() Methods Leading to Remote Denial of Service

Sat, 19 Sep 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Fri, 18 Sep 2026 21:30:00 +0000

Type Values Removed Values Added
Description In Vinyl Cache before 9.0,2, workspace buffer overflow vulnerability was found in the .upper() and .lower() string type methods of VCL. This can be used as a remote denial of service (DoS) vector to make the child process segfault or assert, and then restart. Effectively exploiting this vulnerability requires prior knowledge about the VCL in use and the ability to craft a request that contains a string that is long enough to fill the remaining workspace at the call site while staying under the different request size limits (http_req_size, http_req_hdr_len, etc.).
Weaknesses CWE-787
References
Metrics cvssV4_0

{'score': 2.3, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/AU:N/R:A/V:D/RE:L/U:Clear'}

Subscriptions

No data.

cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-09-19T14:01:28.211Z

Reserved: 2026-09-18T20:30:04.310Z

Link: CVE-2026-93894

cve-icon Vulnrichment

Updated: 2026-09-19T13:59:31.404Z

cve-icon NVD

Status : Received

Published: 2026-09-18T21:18:49.297

Modified: 2026-09-19T14:17:06.097

Link: CVE-2026-93894

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-19T16:45:16Z

Weaknesses