VDB
RHSA-2026:74428
RHSA-2026:74428
PUBLISHED
CVSS 7.099999904632568 HIGH
A flaw was found in libevent. The evhttp_decode_uri_internal function in http.c decodes percent-encoded %00 bytes into literal NUL characters without rejecting them, allowing an attacker to craft a URI such as /admin/secret%00.jpg where extension-based access checks see .jpg but the server processes /admin/secret, bypassing path-based access controls. Additionally, evhttp_header_is_valid_value accepts obsolete HTTP header line folding (CRLF followed by SP/HT), which RFC 9112 states new implementations should reject, creating a header injection vector in proxy chains where the frontend rejects obs-fold but libevent accepts it. This could lead to access control bypass, header injection, or request smuggling.
Risk Scores
CVSS 3.1
7.099999904632568
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | rhcos-ppc64le-4.22.9.8.202609291947-0 as a component of Red Hat OpenShift Container Platform 4.22 | 4.22.9.8.202609291947-0 |
| Red Hat | rhcos-s390x-4.22.9.8.202609291947-0 as a component of Red Hat OpenShift Container Platform 4.22 | 4.22.9.8.202609291947-0 |
| Red Hat | rhcos-aarch64-4.22.9.8.202609291947-0 as a component of Red Hat OpenShift Container Platform 4.22 | 4.22.9.8.202609291947-0 |
| Red Hat | rhcos-x86_64-4.22.9.8.202609291947-0 as a component of Red Hat OpenShift Container Platform 4.22 | 4.22.9.8.202609291947-0 |
Timeline
- Oct 6, 2026 CVE Published
- Oct 30, 2026 CVE Updated
- Oct 30, 2026 Distribution Patch
- Oct 30, 2026 Distribution Patch
- Oct 30, 2026 Security Advisory
- Oct 30, 2026 Security Advisory
- Oct 30, 2026 Security Advisory
- Oct 30, 2026 Security Advisory
- Oct 30, 2026 Security Advisory
- Oct 30, 2026 Security Advisory
- Oct 30, 2026 Security Advisory
References
- https://access.redhat.com/errata/RHSA-2026:74428 advisory
- https://access.redhat.com/security/updates/classification/#important advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2520666 issue
- https://bugzilla.redhat.com/show_bug.cgi?id=2528676 issue
- https://bugzilla.redhat.com/show_bug.cgi?id=2532176 issue
- https://bugzilla.redhat.com/show_bug.cgi?id=2535051 issue
- https://bugzilla.redhat.com/show_bug.cgi?id=2535054 issue
- https://bugzilla.redhat.com/show_bug.cgi?id=2535391 issue
- https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_74428.json advisory
- https://access.redhat.com/security/cve/CVE-2026-63385 advisory
- https://www.cve.org/CVERecord?id=CVE-2026-63385 advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-63385 advisory
- https://github.com/libevent/libevent/commit/758be0c0f69c1934ef9a84ab39e9f9e5fde2e6d0 advisory
- https://github.com/libevent/libevent/commit/9170dd35e64714613e8d13b290587cfc28e258e2 advisory
- https://github.com/libevent/libevent/releases/tag/release-2.1.13-stable advisory
- https://github.com/libevent/libevent/releases/tag/release-2.2.2-alpha advisory
- https://github.com/libevent/libevent/security/advisories/GHSA-jcwh-pvf2-73p2 advisory
- https://access.redhat.com/security/cve/CVE-2026-80844 advisory
- https://access.redhat.com/security/vulnerabilities/RHSB-2026-011 advisory
- https://www.cve.org/CVERecord?id=CVE-2026-80844 advisory
…and 18 more