SB2026101552 - Fedora 43 update for erlang
Published: October 15, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 2 vulnerabilities.
1) Heap-based buffer overflow (CVE-ID: CVE-2026-75538)
CWE-ID: CWE-122 - Heap-based Buffer Overflow
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 a heap-based buffer overflow caused by signed integer overflow in the inet TCP driver when processing TCP packets in {packet,4} mode. A remote attacker can send a specially crafted packet with an incorrect length value to cause a denial of service.
Only TCP ports using the inet driver with {packet,4} mode are affected.
2) Improper Handling of Case Sensitivity (CVE-ID: CVE-2026-73270)
CWE-ID: CWE-178 - Improper Handling of Case Sensitivity
CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to bypass authentication and access protected resources.
The vulnerability exists due to improper handling of case sensitivity in the mod_auth module in OTP's inets httpd server when processing requests for protected directory paths on case-insensitive filesystems. A remote attacker can request the same protected resource using different path casing to bypass authentication and access protected resources.
Only deployments on case-insensitive filesystems such as Windows and macOS are vulnerable, and exploitation requires one or more directory blocks configured with mod_auth.
Remediation
Install update from vendor's website.