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7 vulnerabilities found for by varnish-software
CVE-2026-40396 (GCVE-0-2026-40396)
Vulnerability from cvelistv5
Published
2026-04-12 19:23
Modified
2026-04-13 15:35
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-670 - Always-Incorrect Control Flow Implementation
Summary
Varnish Cache 9 before 9.0.1 allows a "workspace overflow" denial of service (daemon panic) after timeout_linger. A malicious client could send an HTTP/1 request, wait long enough until the session releases its worker thread (timeout_linger) and resume traffic before the session is closed (timeout_idle) sending more than one request at once to trigger a pipelining operation between requests. This vulnerability affecting Varnish Cache 9.0.0 emerged from a port of the Varnish Enterprise non-blocking architecture for HTTP/2. New code was needed to adapt to a more recent workspace API that formalizes the pipelining operation. In addition to the workspace change on the Varnish Cache side, other differences created merge conflicts, like partial support for trailers in Varnish Enterprise. The conflict resolution missed one code path configuring pipelining to perform a complete workspace rollback, losing the guarantee that prefetched data would fit inside workspace_client during the transition from one request to the next. This can result in a workspace overflow, triggering a panic and crashing the Varnish server.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| varnish-software | Varnish Cache |
Version: 9.0.0 ≤ |
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CVE-2026-40395 (GCVE-0-2026-40395)
Vulnerability from cvelistv5
Published
2026-04-12 19:21
Modified
2026-04-13 15:45
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| varnish-software | Varnish Enterprise |
Version: 6.0.9r5 < 6.0.16r12 |
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CVE-2026-40394 (GCVE-0-2026-40394)
Vulnerability from cvelistv5
Published
2026-04-12 19:17
Modified
2026-04-13 15:45
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-670 - Always-Incorrect Control Flow Implementation
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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| varnish-software | Varnish Cache |
Version: 9.0.0 ≤ |
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CVE-2026-34475 (GCVE-0-2026-34475)
Vulnerability from cvelistv5
Published
2026-03-27 19:40
Modified
2026-03-27 20:01
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-180 - Incorrect Behavior Order: Validate Before Canonicalize
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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| varnish-software | Varnish Cache |
Version: 0 < 6.0.17 LTS Version: 7.0.0 < 8.0.1 |
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CVE-2025-47905 (GCVE-0-2025-47905)
Vulnerability from cvelistv5
Published
2025-05-13 00:00
Modified
2025-05-29 09:03
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Summary
Varnish Cache before 7.6.3 and 7.7 before 7.7.1, and Varnish Enterprise before 6.0.13r14, allow client-side desync via HTTP/1 requests, because the product incorrectly permits CRLF to be skipped to delimit chunk boundaries.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| varnish-software | Varnish Cache |
Version: 0 < 6.0.14 LTS Version: 7.0.0 < 7.6.3 Version: 7.7.0 < 7.7.1 |
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CVE-2025-30347 (GCVE-0-2025-30347)
Vulnerability from cvelistv5
Published
2025-03-21 00:00
Modified
2025-03-21 15:52
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-125 - Out-of-bounds Read
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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| varnish-software | Varnish Enterprise |
Version: 6 < 6.0.13r13 |
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CVE-2025-30346 (GCVE-0-2025-30346)
Vulnerability from cvelistv5
Published
2025-03-21 00:00
Modified
2025-04-03 13:05
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Summary
Varnish Cache before 7.6.2 and Varnish Enterprise before 6.0.13r10 allow client-side desync via HTTP/1 requests.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| varnish-software | Varnish Cache |
Version: 7.5.0 ≤ |
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