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Highest advisory severityCritical 4 vendors · 4 advisories

CVE-2026-42533

vulnerability exists in NGINX Plus and NGINX Open Source when a map directive uses regex matching and a string expression references the map's regex capture variables before referencing the map output variable

CVE-2026-42533: vulnerability exists in NGINX Plus and NGINX Open Source when a map directive uses regex matching and a string expression references the map's…

Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.

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CVE-2026-42533 key facts

CISA KEV
Not listed (catalog checked )
Highest advisory severity
Critical
CVSS base score
9.2 (F5), 9.2 (NetApp), 7 (Red Hat)
Fixed releases
  • F5: 37.0.3.1, R36 P7, 1.31.3, 1.30.4
  • NetApp: NetApp Console Agent Container (static-file-server): 4.10.0
  • Red Hat: nginx-2:1.26.3-6.el10_2.7, nginx:1.24-8100020260908154808.489197e6, nginx-2:1.20.1-28.el9_8.6, nginx:1.26-9080020260908105507.9, nginx:1.24-9080020260908110425.9, nginx-main-1.30.4-2.hum1 and 6 more in the advisory
Vendor advisories
4 from F5, NetApp, Red Hat, Veeam
VulniPulse record
Published · Updated

Scores, vectors, weaknesses and fixed releases are quoted from vendor advisories that cover only CVE-2026-42533; bulletin-wide values are not repeated here.

Is CVE-2026-42533 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-42533 is not in the CISA KEV catalog (checked ) and no tracked advisory for it reports exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2026-42533?

Upgrade to a fixed release named by the vendor:

  • F5: 37.0.3.1, R36 P7, 1.31.3, 1.30.4
  • NetApp: NetApp Console Agent Container (static-file-server): 4.10.0
  • Red Hat: nginx-2:1.26.3-6.el10_2.7, nginx:1.24-8100020260908154808.489197e6, nginx-2:1.20.1-28.el9_8.6, nginx:1.26-9080020260908105507.9, nginx:1.24-9080020260908110425.9, nginx-main-1.30.4-2.hum1
  • Update affected NetApp products to a fixed release: NetApp Console Agent Container (static-file-server): 4.10.0. (NetApp)
  • To mitigate this vulnerability, do not use unnamed captures. Use named captures instead and only use them in the same block with the regex match. Red Hat recommends updating nginx to the latest version when a fix is available. (Red Hat)

Vendor advisory comparison

F5

1 advisory
  • Advisory severityCritical9.2

    Critical [CVE-2026-42533] vulnerability exists in NGINX Plus and NGINX Open Source when a map directive uses regex matching and a string expression references the map's regex capture variables before referencing the map output variable

    CVE-2026-42533Source published Source updated

    A vulnerability exists in NGINX Plus and NGINX Open Source when a map directive uses regex matching and a string expression references the map's regex capture variables before referencing the map output variable. Alternatively, the same result could be achieved by using a non-cacheable variable in a string expression under certain conditions. An unauthenticated attacker along with conditions beyond their control can exploit this vulnerability by sending crafted HTTP requests. This may cause a heap buffer overflow in the NGINX worker process leading to a restart. Additionally, attackers can execute code on systems with Address Space Layout Randomization (ASLR) disabled or when the attacker can bypass ASLR. Impact: This vulnerability may allow remote attackers to cause a denial-of-service…

    Affected products in this advisory
    • NGINX Plus
    • NGINX Open Source
    Source-reported affected versions
    • NGINX Plus 37.0.0.1 before 37.0.3.1
    • NGINX Plus R36 before R36 P7
    • NGINX Plus R33
    • NGINX Open Source 1.31.2 before 1.31.3

    1 more entries in the full advisory.

    Source-reported fixed versions
    • 37.0.3.1
    • R36 P7
    • 1.31.3
    • 1.30.4
    Mitigation guidance
    No mitigation guidance extracted; consult the source.
    Full advisory and evidenceOpen source bulletin

NetApp

1 advisory
  • Advisory severityCritical9.2

    Critical [CVE-2026-42533] NGINX Vulnerability in NetApp Products

    NTAP-20260724-0001Source published Source updated

    NGINX versions 1.15.8 through 1.30.3 and 1.31 through 1.31.2 are susceptible to a vulnerability which when successfully exploited could lead to disclosure of sensitive information, addition or modification of data, or Denial of Service (DoS). Affected products: NetApp Console Agent Container (static-file-server). NetApp reports that one or more additional products remain under investigation; review the canonical advisory for current status. NetApp states there is no workaround available at this time.

    Affected products in this advisory
    • NetApp Console Agent Container (static-file-server)
    Source-reported affected versions
    • 1.15.8
    • 1.30.3
    • 1.31
    • 1.31.2
    Source-reported fixed versions
    • NetApp Console Agent Container (static-file-server): 4.10.0
    Mitigation guidance
    • Update affected NetApp products to a fixed release: NetApp Console Agent Container (static-file-server): 4.10.0.
    Full advisory and evidenceOpen source bulletin

Red Hat

1 advisory
  • Advisory severityHigh7.0

    High [CVE-2026-42533] Arbitrary code execution via crafted HTTP requests

    CVE-2026-42533Source published Source updated

    A vulnerability exists in NGINX Plus and NGINX Open Source when a map directive uses regex matching and a string expression references the map's regex capture variables before referencing the map output variable. Alternatively, the same result could be achieved by using a non-cacheable variable in a string expression under certain conditions. An unauthenticated attacker along with conditions beyond their control can exploit this vulnerability by sending crafted HTTP requests. This may cause a heap buffer overflow in the NGINX worker process leading to a restart. Additionally, attackers can execute code on systems with Address Space Layout Randomization (ASLR) disabled or when the attacker can bypass ASLR. Impact: This vulnerability may allow remote attackers to cause a denial-of-service…

    Affected products in this advisory
    • Red Hat Enterprise Linux 10
    • Red Hat Enterprise Linux 8
    • Red Hat Enterprise Linux 9
    • Red Hat Hardened Images

    2 more entries in the full advisory.

    Source-reported affected versions
    Affected-version details not available in this record.
    Source-reported fixed versions
    • nginx-2:1.26.3-6.el10_2.7
    • nginx:1.24-8100020260908154808.489197e6
    • nginx-2:1.20.1-28.el9_8.6
    • nginx:1.26-9080020260908105507.9

    8 more entries in the full advisory.

    Mitigation guidance
    • To mitigate this vulnerability, do not use unnamed captures. Use named captures instead and only use them in the same block with the regex match. Red Hat recommends updating nginx to the latest version when a fix is available.
    Full advisory and evidenceOpen source bulletin

Veeam

1 advisory
  • Advisory severityCritical

    Critical [CVE-2020-14040 +102] List of Security Fixes and Improvements in Veeam Kasten for Kubernetes

    KB4825Source published

    This bulletin covers 103 CVEs. The products, versions, score and guidance below describe the bulletin; check its source for applicability to this specific CVE.

    List of Security Fixes and Improvements in Veeam Kasten for Kubernetes KB ID: 4825 Product: Kasten K10 by Veeam | 3 | 5 | 5.5 | 6 | 6.5 Published: 2026-03-02 Last Modified: Purpose This article aims to provide our customers' security and compliance teams with detailed information on security improvements. - Veeam Kasten for Kubernetes — Release Notes - Upgraded the frontend's bundled JavaScript dependencies to resolve GHSA-g2v6-rqmx-r4w6 in @vue/server-renderer (High). - Also resolves 7 Medium severity CVEs in the same and other packages. - Upgraded to latest UBI base image to resolve multiple CVEs in base OS packages. - Updated the Go runtime to resolve additional upstream Go CVEs. - Updated the bundled Prometheus Helm chart to resolve security issues. - Upgraded the Prometheus base…

    Related products — impact not confirmed
    No product details extracted. Check the source bulletin.
    Source-reported affected versions
    Affected-version details not available in this record.
    Source-reported fixed versions
    • 8.5.10
    • 8.5.5
    • 1.26.1
    • 8.5.3

    20 more entries in the full advisory.

    Mitigation guidance
    • List of Security Fixes and Improvements in Veeam Kasten for Kubernetes KB ID: 4825 Product: Veeam Kasten for Kubernetes | 7 | 7.5 | 8 | 8.5 | 9 Kasten K10 by Veeam | 3 | 5 | 5.5 | 6 | 6.5 Published: 2026-03-02 Last Modified: 2026-10-23 Purpose This article describes all security-related fixes and improvements introduced in each release or update of Veeam Kasten for Kubernetes.
    • It is recommended to upgrade Veeam Kasten and to refresh the token by manually logging out.
    • Mitigation: Configure a bucket-level Default Object Lock retention so the object store stamps new objects at write time, or upgrade to Kasten 8.5.10.
    • Veeam Kasten for Kubernetes 8.5.5 Upgrade to Go 1.26.1 to address CVE-2026-25679 and CVE-2026-27142 Updated the UBI base image to address CVE-2026-4111 Veeam Kasten for Kubernetes 8.5.3 Upgrade to Go 1.25.7 to address CVE-2025-61732.

    4 more entries in the full advisory.

    Workarounds
    • Veeam Kasten for Kubernetes 8.0.14 Improved logging security for specific block mode datamover upload Pod invocations.
    Full advisory and evidenceOpen source bulletin

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