Threats Tagged 'cve-2026-19730'

The podman tool manages pods, container images, and containers. It is part of the libpod library, which is for applications that use container pods. Container pods is a concept in Kubernetes. Security Fix(es): * podman: Go crypto/x509: Certificate validation bypass due to incorrect DNS constraint application (CVE-2026-33810) * podman: Go net/http: Unencrypted HTTP/2 connections vulnerable to Denial of Service (CVE-2026-56853) * podman: Go encoding/asn1: Denial of Service via excessive recursion in Unmarshal (CVE-2026-33818) * podman: golang net/url: Denial of Service from quadratic complexity in path resolution (CVE-2026-56860) * podman: Go: Denial of Service via XML decoding recursion depth issue (CVE-2026-56859) * podman: Go html/template: Cross-Site Scripting via pathological input (CVE-2026-56858) * podman: Golang crypto/tls: Denial of Service via indefinite KeyUpdate messages (CVE-2026-56862) * podman: golang.org/x/text: Denial of Service via invalid UTF-8 input (CVE-2026-56852) * podman: net/mail: Denial of Service via pathological email address parsing (CVE-2026-42499) * podman: Quadlet install --replace non-truncating write retains removed host-access directives (CVE-2026-19730) * podman: moby/go-archive: Arbitrary file write via link following in tar extraction (CVE-2026-17106) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

The 'podman quadlet install --replace' command opens the existing destination file with O_CREATE|O_WRONLY but omits O_TRUNC. When the initial reflink copy attempt fails (common on non-reflink-capable filesystems including many RHEL default XFS configurations), the fallback in ReflinkOrCopy uses io.Copy which performs a non-truncating write. If the original Quadlet is larger than the new Quadlet, the file is not truncated and content from the original is preserved. The command completes with no warning. There is no risk of information leakage as the user already had access to the Quadlet in order to replace it, and in most cases, this would only lead to invalid Quadlet files. However, security-related options from the end of the old Quadlet could be included in the new Quadlet, and if the truncation resulted in a valid Quadlet file, this could result in undesirable behavior. For example, running podman quadlet install --replace to remove a single line from the end of a Quadlet - including security-sensitive content, like AddCapability - will fail, and the option will continue to be used. Further, with Volume Quadlets, this can include additional mounts which can cause content to be unintentionally exposed into containers. If, later, the image is updated then compromised content might be leaked to an attacker. The vulnerable code paths are in pkg/domain/infra/abi/quadlet.go (lines 338-360, O_CREATE|O_WRONLY without O_TRUNC) and vendor/go.podman.io/storage/pkg/fileutils/reflink_linux.go (lines 12-19, non-truncating io.Copy fallback).