An off-by-one Error issue was discovered in Systemd in format_timespan() function of time-util.c. An attacker could supply specific values for time and accuracy that leads to buffer overrun in format_timespan(), leading to a Denial of Service.
https://security.gentoo.org/glsa/202305-15
https://lists.debian.org/debian-lts-announce/2023/06/msg00036.html
https://github.com/systemd/systemd/pull/23933
https://github.com/systemd/systemd/issues/23928
https://github.com/systemd/systemd/commit/9102c625a673a3246d7e73d8737f3494446bad4e