CVE-2026-93894
In Vinyl Cache before 9.0,2, workspace buffer overflow vulnerability was found in the .upper()...
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.).
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
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.).
- Record
CVE-2026-93894- CVSS 4.0
- 2.3 Low
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 - Weakness
- CWE-787
- Updated
- 2026-11-02
EUVDEUVD-2026-83400
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.).
- Record
EUVD-2026-83400- CVSS 4.0
- 2.3 Low
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 - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-pfj3-384h-g8q8
In Vinyl Cache before 9.0,2, workspace buffer overflow vulnerability was found in the .upper()...
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.).
- Record
GHSA-pfj3-384h-g8q8- CVSS 4.0
- 2.3 Low
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/E:X/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:N/R:A/V:D/RE:L/U:Clear - Weakness
- CWE-787
- Updated
- 2026-11-02
NVD
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.).
- Record
CVE-2026-93894- CVSS 4.0
- 2.3 Low
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/E:X/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:N/R:A/V:D/RE:L/U:Clear - Weakness
- CWE-787
- Updated
- 2026-11-02
OSVDEBIAN-CVE-2026-93894
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.).
- Record
DEBIAN-CVE-2026-93894- CVSS 4.0
- 2.3 Low
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/E:X/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:N/R:A/V:D/RE:L/U:Clear - Updated
- 2026-11-04
OSVUBUNTU-CVE-2026-93894
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.).
- Record
UBUNTU-CVE-2026-93894- CVSS 4.0
- 2.3 Low
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 - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
varnishDebian:12 |
All versions, plus listed versions 7.1.1-1.17.1.1-1.1+deb12u17.1.1-1.27.1.1-2+deb12u17.5.0-1 Show 15 moreShow less7.5.0-27.5.0-37.6.0-17.6.0-27.6.1-17.6.1-27.7.0-17.7.0-27.7.0-37.7.1-17.7.2-17.7.2-27.7.3-17.7.3-27.7.3-3 |
None known |
varnishDebian:13 |
before 7.7.0-3+deb13u2, plus listed versions 7.7.0-37.7.0-3+deb13u1 |
7.7.0-3+deb13u2 |
vinyl-cacheDebian:14 |
before 9.0.1-4.1, plus listed versions 9.0.0+20260429-29.0.0+20260429-39.0.1-19.0.1-29.0.1-39.0.1-4 |
9.0.1-4.1 |
varnishUbuntu:14.04:LTS |
All versions, plus listed versions 3.0.4-1ubuntu13.0.4-1ubuntu23.0.5-1ubuntu23.0.5-23.0.5-2ubuntu0.1 |
None known |
varnishUbuntu:Pro:16.04:LTS |
All versions, plus listed versions 4.0.3-14.1.0-14.1.0-24.1.1-14.1.1-1ubuntu0.24.1.1-1ubuntu0.2+esm1 |
None known |
varnishUbuntu:Pro:18.04:LTS |
All versions, plus listed versions 5.0.0-7.15.2.1-15.2.1-1ubuntu0.15.2.1-1ubuntu0.1+esm1 |
None known |
varnishUbuntu:Pro:20.04:LTS |
All versions, plus listed versions 6.1.1-16.2.1-26.2.1-2ubuntu0.1~esm16.2.1-2ubuntu0.1~esm26.2.1-2ubuntu0.16.2.1-2ubuntu0.26.2.1-2ubuntu0.2+esm1 |
None known |
varnishUbuntu:Pro:22.04:LTS |
All versions, plus listed versions 6.5.2-16.6.1-16.6.1-1ubuntu0.26.6.1-1ubuntu0.2+esm1 |
None known |
varnishUbuntu:24.04:LTS |
All versions, plus listed versions 7.1.1-1.1ubuntu1 |
None known |
varnishUbuntu:26.10 |
All versions, plus listed versions 7.7.3-1build1 |
None known |
vinyl-cacheUbuntu:26.10 |
All versions, plus listed versions 9.0.1-4 |
None known |
varnishUbuntu:26.04:LTS |
All versions, plus listed versions 7.7.3-17.7.3-1build1 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, facts | OSV | |
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-93894 is a low vulnerability (CVSS 2.3) in The Vinyl Cache Project Vinyl Cache, published September 18, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.36%, the 29th percentile. Fixed in varnish 7.7.0-3+deb13u2.