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12 vulnerabilities found for varnish_enterprise by varnish-software
CVE-2026-40395 (GCVE-0-2026-40395)
Vulnerability from nvd – Published: 2026-04-12 19:21 – Updated: 2026-04-13 15:45
VLAI
Summary
Varnish Enterprise before 6.0.16r12 allows a "workspace overflow" denial of service (daemon panic) for shared VCL. The headerplus.write_req0() function from vmod_headerplus updates the underlying req0, which is normally the original read-only request from which req is derived (readable and writable from VCL). This is useful in the active VCL, after amending req, to prepare a refined req0 before switching to a different VCL with the return (vcl(<label>)) action. This is for example how the Varnish Controller operates shared VCL deployments. If the amended req contained too many header fields for req0, this would have resulted in a workspace overflow that would in turn trigger a panic and crash the Varnish Enterprise server. This could be used as a Denial of Service attack vector by malicious clients.
Severity
4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| varnish-software | Varnish Enterprise |
Affected:
6.0.9r5 , < 6.0.16r12
(custom)
|
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CVE-2026-40394 (GCVE-0-2026-40394)
Vulnerability from nvd – Published: 2026-04-12 19:17 – Updated: 2026-04-13 15:45
VLAI
Summary
Varnish Cache 9 before 9.0.1 and Varnish Enterprise before 6.0.16r11 allows a "workspace overflow" denial of service (daemon panic) for certain amounts of prefetched data. The setup of an HTTP/2 session starts with a speculative HTTP/1 transport, and upon upgrading to h2 the HTTP/1 request is repurposed as stream zero. During the upgrade, a buffer allocation is made to reserve space to send frames to the client. This allocation would split the original workspace, and depending on the amount of prefetched data, the next fetch could perform a pipelining operation that would run out of workspace.
Severity
4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-670 - Always-Incorrect Control Flow Implementation
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| varnish-software | Varnish Cache |
Affected:
9.0.0 , < 9.0.1
(semver)
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CVE-2026-34475 (GCVE-0-2026-34475)
Vulnerability from nvd – Published: 2026-03-27 19:40 – Updated: 2026-03-27 20:01
VLAI
Summary
Varnish Cache before 8.0.1 and Varnish Enterprise before 6.0.16r12, in certain unchecked req.url scenarios, mishandle URLs with a path of / for HTTP/1.1, potentially leading to cache poisoning or authentication bypass.
Severity
5.4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-180 - Incorrect Behavior Order: Validate Before Canonicalize
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| varnish-software | Varnish Cache |
Affected:
0 , < 6.0.17 LTS
(custom)
Affected: 7.0.0 , < 8.0.1 (custom) |
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CVE-2025-30347 (GCVE-0-2025-30347)
Vulnerability from nvd – Published: 2025-03-21 00:00 – Updated: 2025-03-21 15:52
VLAI
Summary
Varnish Enterprise before 6.0.13r13 allows remote attackers to obtain sensitive information via an out-of-bounds read for range requests on ephemeral MSE4 stevedore objects.
Severity
4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-125 - Out-of-bounds Read
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| varnish-software | Varnish Enterprise |
Affected:
6 , < 6.0.13r13
(custom)
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CVE-2025-30346 (GCVE-0-2025-30346)
Vulnerability from nvd – Published: 2025-03-21 00:00 – Updated: 2025-04-03 13:05
VLAI
Summary
Varnish Cache before 7.6.2 and Varnish Enterprise before 6.0.13r10 allow client-side desync via HTTP/1 requests.
Severity
5.4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| varnish-software | Varnish Cache |
Affected:
7.5.0 , < 7.6.2
(semver)
|
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CVE-2023-41104 (GCVE-0-2023-41104)
Vulnerability from nvd – Published: 2023-08-23 00:00 – Updated: 2024-10-03 14:09
VLAI
Summary
libvmod-digest before 1.0.3, as used in Varnish Enterprise 6.0.x before 6.0.11r5, has an out-of-bounds memory access during base64 decoding, leading to both authentication bypass and information disclosure; however, the exact attack surface will depend on the particular VCL (Varnish Configuration Language) configuration in use.
Severity
No CVSS data available.
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- n/a
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| libvmod_digest | libvmod_digest |
Affected:
0 , < 1.0.3
(custom)
Affected: varnish_enterprise_6.0x , < 6.0.11r5 (custom) cpe:2.3:a:libvmod_digest:libvmod_digest:*:*:*:*:*:*:*:* |
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CVE-2026-40395 (GCVE-0-2026-40395)
Vulnerability from cvelistv5 – Published: 2026-04-12 19:21 – Updated: 2026-04-13 15:45
VLAI
Summary
Varnish Enterprise before 6.0.16r12 allows a "workspace overflow" denial of service (daemon panic) for shared VCL. The headerplus.write_req0() function from vmod_headerplus updates the underlying req0, which is normally the original read-only request from which req is derived (readable and writable from VCL). This is useful in the active VCL, after amending req, to prepare a refined req0 before switching to a different VCL with the return (vcl(<label>)) action. This is for example how the Varnish Controller operates shared VCL deployments. If the amended req contained too many header fields for req0, this would have resulted in a workspace overflow that would in turn trigger a panic and crash the Varnish Enterprise server. This could be used as a Denial of Service attack vector by malicious clients.
Severity
4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| varnish-software | Varnish Enterprise |
Affected:
6.0.9r5 , < 6.0.16r12
(custom)
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CVE-2026-40394 (GCVE-0-2026-40394)
Vulnerability from cvelistv5 – Published: 2026-04-12 19:17 – Updated: 2026-04-13 15:45
VLAI
Summary
Varnish Cache 9 before 9.0.1 and Varnish Enterprise before 6.0.16r11 allows a "workspace overflow" denial of service (daemon panic) for certain amounts of prefetched data. The setup of an HTTP/2 session starts with a speculative HTTP/1 transport, and upon upgrading to h2 the HTTP/1 request is repurposed as stream zero. During the upgrade, a buffer allocation is made to reserve space to send frames to the client. This allocation would split the original workspace, and depending on the amount of prefetched data, the next fetch could perform a pipelining operation that would run out of workspace.
Severity
4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-670 - Always-Incorrect Control Flow Implementation
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| varnish-software | Varnish Cache |
Affected:
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(semver)
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CVE-2026-34475 (GCVE-0-2026-34475)
Vulnerability from cvelistv5 – Published: 2026-03-27 19:40 – Updated: 2026-03-27 20:01
VLAI
Summary
Varnish Cache before 8.0.1 and Varnish Enterprise before 6.0.16r12, in certain unchecked req.url scenarios, mishandle URLs with a path of / for HTTP/1.1, potentially leading to cache poisoning or authentication bypass.
Severity
5.4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-180 - Incorrect Behavior Order: Validate Before Canonicalize
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| varnish-software | Varnish Cache |
Affected:
0 , < 6.0.17 LTS
(custom)
Affected: 7.0.0 , < 8.0.1 (custom) |
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CVE-2025-30346 (GCVE-0-2025-30346)
Vulnerability from cvelistv5 – Published: 2025-03-21 00:00 – Updated: 2025-04-03 13:05
VLAI
Summary
Varnish Cache before 7.6.2 and Varnish Enterprise before 6.0.13r10 allow client-side desync via HTTP/1 requests.
Severity
5.4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| varnish-software | Varnish Cache |
Affected:
7.5.0 , < 7.6.2
(semver)
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CVE-2025-30347 (GCVE-0-2025-30347)
Vulnerability from cvelistv5 – Published: 2025-03-21 00:00 – Updated: 2025-03-21 15:52
VLAI
Summary
Varnish Enterprise before 6.0.13r13 allows remote attackers to obtain sensitive information via an out-of-bounds read for range requests on ephemeral MSE4 stevedore objects.
Severity
4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-125 - Out-of-bounds Read
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| varnish-software | Varnish Enterprise |
Affected:
6 , < 6.0.13r13
(custom)
|
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CVE-2023-41104 (GCVE-0-2023-41104)
Vulnerability from cvelistv5 – Published: 2023-08-23 00:00 – Updated: 2024-10-03 14:09
VLAI
Summary
libvmod-digest before 1.0.3, as used in Varnish Enterprise 6.0.x before 6.0.11r5, has an out-of-bounds memory access during base64 decoding, leading to both authentication bypass and information disclosure; however, the exact attack surface will depend on the particular VCL (Varnish Configuration Language) configuration in use.
Severity
No CVSS data available.
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- n/a
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| libvmod_digest | libvmod_digest |
Affected:
0 , < 1.0.3
(custom)
Affected: varnish_enterprise_6.0x , < 6.0.11r5 (custom) cpe:2.3:a:libvmod_digest:libvmod_digest:*:*:*:*:*:*:*:* |
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