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    4 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)
    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:L
    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
    Impacted products
    Vendor Product Version
    varnish-software Varnish Enterprise Affected: 6.0.9r5 , < 6.0.16r12 (custom)
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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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)
    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    Assigner
    References
    Impacted products
    Vendor Product Version
    varnish-software Varnish Enterprise Affected: 6 , < 6.0.13r13 (custom)
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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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)
    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:L
    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
    Impacted products
    Vendor Product Version
    varnish-software Varnish Enterprise Affected: 6.0.9r5 , < 6.0.16r12 (custom)
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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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)
    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    Assigner
    References
    Impacted products
    Vendor Product Version
    varnish-software Varnish Enterprise Affected: 6 , < 6.0.13r13 (custom)
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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