Description
spf.c in Courier Mail Server does not properly handle DNS failures when looking up Sender Policy Framework (SPF) records, which could allow attackers to cause memory corruption.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | courier | 0.47-6 | — |
| Debian 13 | courier | 0.47-6 | — |
| Debian 12 | courier | 0.47-6 | — |
| Debian 3.1 | courier | 0.47-4sarge1 | DSA-784-1 |
Advisories 1
- DSA-784-1 courier - programming error Debian Security (DSA / DLA) · Mar 9, 2026
References
- 15901 third-party-advisory
- http://www.courier-mta.org/?changelog.html