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Highest advisory severityCritical 2 vendors · 2 advisories

CVE-2026-63387

CVE-2026-63387: 2 tracked advisory records across Red Hat, Veeam. Compare vendor sources and published fix guidance.

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.

NVD detail CVE.org

Vendor advisory comparison

Red Hat

1 advisory
  • Advisory severityHigh8.6

    High [CVE-2026-63387] Off-by-one stack buffer overflow leading to denial of service or data corruption

    CVE-2026-63387Source published Source updated

    Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent has an off-by-one stack buffer overflow in evdns.c when dnsname_to_labels formats a name-bearing DNS record at the end of the 64 KB stack buffer allocated by evdns_server_request_format_response. The final-label check permits j plus label_len plus one to equal buf_len, after which the terminating null byte is written to buf[buf_len]. A crafted DNS server response containing PTR, CNAME, MX, NS, or SOA data can trigger the one-byte out-of-bounds write and crash or corrupt the process. A remote attacker could send a specially crafted DNS server response, which may lead to a crash or corruption of the process, resulting in a denial of service or potential information disclosure and integrity impact. This…

    Affected products in this advisory
    • Red Hat Enterprise Linux 10
    • Red Hat Enterprise Linux 8
    • Red Hat Enterprise Linux 9
    • Cert Manager support for Red Hat OpenShift release 1.20

    6 more entries in the full advisory.

    Source-reported affected versions
    • < 2.1.13
    • < 2.2.2-alpha
    Source-reported fixed versions
    • 2.1.13
    • 2.2.2
    • libevent-0:2.1.13-1.el10_2
    • libevent-0:2.1.8-11.el8_10

    25 more entries in the full advisory.

    Mitigation guidance
    • Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
    Full advisory and evidenceOpen source bulletin

Veeam

1 advisory
  • Advisory severityCritical

    Critical [CVE-2020-14040 +67] List of Security Fixes and Improvements in Veeam Kasten for Kubernetes

    KB4825Source published

    This bulletin covers 68 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 - Also resolves 8 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 image to resolve GHSA-hrxh-6v49-42gf - GitHub Advisory - Upgraded Dex image dependencies to resolve multiple Critical and…

    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: 2026-10-06 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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