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Critical 2 vendors · 2 advisories

CVE-2026-63385: HTTP header handling bugs create risk of access control bypass

CVE-2026-63385 key facts

CISA KEV
Not listed (catalogue checked )
Highest advisory rating
Critical
CVSS base score
7.7 (Red Hat)
Fixed releases
  • Red Hat: 2.1.13, 2.2.2, libevent-0:2.1.13-1.el10_2, libevent-0:2.1.8-11.el8_10, libevent-0:2.1.13-1.el9_8, openshift/ose-rhel-coreos-9:4.22.9.8.202609291947-0 and 27 more in the advisory
Vendor advisories
2 from Red Hat, Veeam
Listed by VulniPulse
Record changed

Ratings, versions and fixes are quoted from the vendor advisories that cover only CVE-2026-63385; each belongs to its advisory, not to every product listed. How records are collected and checked.

How do I fix CVE-2026-63385?

Upgrade to a fixed release named by the vendor:

  • Red Hat: 2.1.13, 2.2.2, libevent-0:2.1.13-1.el10_2, libevent-0:2.1.8-11.el8_10, libevent-0:2.1.13-1.el9_8, openshift/ose-rhel-coreos-9:4.22.9.8.202609291947-0
  • 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. (Red Hat)

Vendor advisories for CVE-2026-63385

Red Hat

1 advisory
  • Advisory severityHigh7.7

    High [CVE-2026-63385] HTTP header handling bugs create risk of access control bypass.

    CVE-2026-63385Source published Source updated

    Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent has two HTTP parsing weaknesses in http.c. evhttp_decode_uri_internal decodes percent-encoded %00 bytes into literal NUL characters, which can cause downstream C string operations to truncate a path and bypass validation performed on a different representation. evhttp_header_is_valid_value also accepts obsolete line folding in header values containing carriage return or line feed characters, allowing a proxy and libevent to interpret headers differently and enabling header injection or access control bypass. The CRLF header acceptance is fixed in versions 2.1.13 and 2.2.2-alpha, but the reviewed patches do not clearly remediate the URI NUL-truncation condition. A flaw was found in libevent. The…

    Affected products in this advisory
    • Red Hat Enterprise Linux 10
    • Red Hat Enterprise Linux 8
    • Red Hat Enterprise Linux 9
    • Red Hat OpenShift Container Platform 4.22

    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

    29 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 +110] List of Security Fixes and Improvements in Veeam Kasten for Kubernetes

    KB4825Source published

    This bulletin covers 111 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 13 Medium and 7 Low severity CVEs in the same and other packages. - Upgraded the frontend's bundled JavaScript dependencies to resolve GHSA-g2v6-rqmx-r4w6 in @vue/server-renderer (High). - 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…

    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: 2026-11-05 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

References

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