SB20260731137 - Red Hat Enterprise Linux 8 update for osbuild-composer
Published: July 31, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 5 vulnerabilities.
1) Improper Authorization (CVE-ID: CVE-2026-33186)
CWE-ID: CWE-285 - Improper Authorization
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Amber
The vulnerability allows a remote attacker to gain access to bypass authorization.
The vulnerability exists due to authorization bypass resulting from improper input validation of the HTTP/2 `:path` pseudo-header. A remote attacker can send raw HTTP/2 frames with malformed `:path` headers directly to the gRPC server to bypass authorization.
2) Improper input validation (CVE-ID: CVE-2026-34986)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: 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/E:U/U:Green
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper input validation in JWE decryption in key_wrap.go when processing a JWE object with a key wrapping algorithm and an empty encrypted_key field. A remote attacker can send a specially crafted JWE object to cause a denial of service.
The issue is reachable through ParseEncrypted(), ParseEncryptedJSON(), or ParseEncryptedCompact() followed by Decrypt(), and applications are affected only if accepted key algorithms include key wrapping algorithms.
3) Time-of-check Time-of-use (TOCTOU) Race Condition (CVE-ID: CVE-2026-32282)
CWE-ID: CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to modify file permissions outside the intended root directory.
The vulnerability exists due to improper access control in Root.Chmod and internal/syscall/unix Fchmodat when handling a chmod operation on Linux. A local user can replace the target with a symlink during the check-and-operation window to modify file permissions outside the intended root directory.
Exploitation requires a race condition in which the target is swapped with a symlink while the chmod operation is in progress.
4) Dependency on vulnerable third-party component (CVE-ID: CVE-2026-32283)
CWE-ID: CWE-1395 - Dependency on Vulnerable Third-Party Component
CVSSv4: 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/E:U/U:Green
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to dependency on a vulnerable third-party component in the Go standard library used by Fleet Server when handling network input. A remote attacker can send a specially crafted payload to cause a denial of service.
All configurations are affected.
5) Resource exhaustion (CVE-ID: CVE-2026-32280)
CWE-ID: CWE-400 - Resource exhaustion
CVSSv4: 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/E:U/U:Green
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to uncontrolled resource consumption in the Certificate.Verify chain-building logic in crypto/x509 when processing a large number of intermediate certificates supplied through VerifyOptions.Intermediates. A remote attacker can provide a large number of intermediate certificates to cause a denial of service.
This affects both direct users of crypto/x509 and users of crypto/tls.
Remediation
Install update from vendor's website.