SB2026091543 - Fedora 45 update for mingw-expat
Published: September 15, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 2 vulnerabilities.
1) Unchecked Return Value (CVE-ID: CVE-2026-76956)
CWE-ID: CWE-252 - Unchecked Return Value
CVSSv4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/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 inverted getentropy() return handling in the entropy extraction logic when initializing hash randomization. A remote attacker can conduct a hash-flooding attack to cause a denial of service.
The issue applies where getentropy is configured or detected as the only high-quality entropy extractor.
2) Use-after-free (CVE-ID: CVE-2026-76957)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a lack of handler call depth tracking with custom encoding callbacks. A remote attacker can pass specially crafted XML input to the application, trigger a use-after-free error and perform a denial of service attack.
Remediation
Install update from vendor's website.