CVE Explorer
CVE-2026-40396
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-blocki
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"defaultStatus":"unaffected","product":"Varnish Cache","vendor":"varnish-software","versions":[{"lessThan":"9.0.1","status":"affected","version":"9.0.0","versionType":"semver"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:791dec0a7a713591869b6342ccf7df36e725578df290478a8fcfa63ab600afc2 · sha256:f320a4111f39eec9… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":4,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:L","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:791dec0a7a713591869b6342ccf7df36e725578df290478a8fcfa63ab600afc2 · sha256:f320a4111f39eec9… · /containers/cna/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-670","description":"CWE-670 Always-Incorrect Control Flow Implementation","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:791dec0a7a713591869b6342ccf7df36e725578df290478a8fcfa63ab600afc2 · sha256:f320a4111f39eec9… · /containers/cna/problemTypes/0/descriptions/0
Source references
2 source assertions{"url":"https://github.com/varnish/varnish/issues/15"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:791dec0a7a713591869b6342ccf7df36e725578df290478a8fcfa63ab600afc2 · sha256:f320a4111f39eec9… · /containers/cna/references/1
{"url":"https://github.com/varnish/varnish/releases/tag/varnish-9.0.1"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:791dec0a7a713591869b6342ccf7df36e725578df290478a8fcfa63ab600afc2 · sha256:f320a4111f39eec9… · /containers/cna/references/0
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.