SB2026092409 - Red Hat Enterprise Linux 9 update for skopeo
Published: September 24, 2026 Updated: September 30, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 6 vulnerabilities.
1) Cross-site scripting (CVE-ID: CVE-2026-56858)
CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVSSv4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
The vulnerability allows a remote attacker to inject arbitrary content, potentially leading to cross-site scripting.
The vulnerability exists due to improper neutralization of special elements in html/template when rendering pathological inputs that close an unescaped '/' early. A remote attacker can supply crafted input data to inject arbitrary content, potentially leading to cross-site scripting.
2) Uncontrolled Recursion (CVE-ID: CVE-2026-33818)
CWE-ID: CWE-674 - Uncontrolled Recursion
CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to uncontrolled recursion in Unmarshal and UnmarshalWithParams in encoding/asn1 when parsing deeply nested recursive structures. A remote attacker can supply specially crafted ASN.1 input to cause a denial of service.
3) Resource exhaustion (CVE-ID: CVE-2026-56860)
CWE-ID: CWE-400 - Resource exhaustion
CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to uncontrolled resource consumption in net/url URL.Parse and URL.ResolveReference when processing relative paths containing parent directory ('..') segments. A remote attacker can send specially crafted input to cause a denial of service.
4) Resource exhaustion (CVE-ID: CVE-2026-56853)
CWE-ID: CWE-400 - Resource exhaustion
CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper timeout handling in net/http when processing new connections for unencrypted HTTP/2 support. A remote attacker can open a connection and withhold the expected HTTP/2 client preface bytes to cause a denial of service.
Only servers configured to support unencrypted HTTP/2 are vulnerable.
5) Improper control of a resource through its lifetime (CVE-ID: CVE-2026-56862)
CWE-ID: CWE-664 - Improper control of a resource through its lifetime
CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper state management in crypto/tls when processing handshake messages before handshake completion. A remote attacker can send repeated KeyUpdate messages to cause a denial of service.
6) Path traversal (CVE-ID: CVE-2025-11395)
CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to overwrite attacker-chosen files and modify their attributes.
The vulnerability exists due to improper archive extraction in storage/pkg/archive when extracting a maliciously crafted tar archive. A remote attacker can provide a maliciously crafted tar archive to overwrite attacker-chosen files and modify their attributes.
User interaction is required to extract the crafted archive.
Remediation
Install update from vendor's website.