Fetchmail is vulnerable to denial of service. report_vbuild in report.c sometimes omits initialization of the vsnprintf va_list argument, allowing mail servers to cause a denial of service or possibly have unspecified other impact via long error messages.
www.openwall.com/lists/oss-security/2021/07/28/5
www.openwall.com/lists/oss-security/2021/08/09/1
lists.fedoraproject.org/archives/list/[email protected]/message/AGYO5AHSXTCKA4NQC2Z4H3XMMYNAGC77/
lists.fedoraproject.org/archives/list/[email protected]/message/OIXKO6QW3AUHGJVWKJXBCOVBYJUJRBFC/
security-tracker.debian.org/tracker/CVE-2021-36386
www.fetchmail.info/fetchmail-SA-2021-01.txt
www.fetchmail.info/security.html