Description
In mutt and neomutt the In-Reply-To email header field is not protected by cryptographic signing which allows an attacker to reuse an unencrypted but signed email message to impersonate the original sender.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | mutt | — | — |
| Red Hat | Red Hat Enterprise Linux 7 | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
| Red Hat | Red Hat Enterprise Linux 9 | — | — |
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 | mutt | No fix yet | — |
| Debian 14 | neomutt | 20241002+dfsg-1 | — |
| Debian 13 | mutt | No fix yet | — |
| Debian 13 | neomutt | 20241002+dfsg-1 | — |
| Debian 12 | mutt +1 | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | mutt | No fix yet | — |
| Ubuntu 26.04 LTS | mutt | No fix yet | — |
| Ubuntu 25.10 | mutt | No fix yet | — |
| Ubuntu 24.04 LTS | mutt | No fix yet | — |
| Ubuntu 22.04 LTS | mutt | No fix yet | — |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | mutt | No fix yet | — |
| Ubuntu Pro 24.04 LTS | neomutt | 20231103+dfsg1-1ubuntu0.1~esm1 | USN-7204-1 |
| Ubuntu Pro 22.04 LTS | neomutt | 20211029+dfsg1-1ubuntu0.1~esm1 | USN-7204-1 |
| Ubuntu Pro 20.04 LTS | neomutt | 20191207+dfsg.1-1.1ubuntu0.1~esm1 | USN-7204-1 |
| Ubuntu Pro 18.04 LTS | mutt | No fix yet | — |
| Ubuntu Pro 18.04 LTS | neomutt | 20171215+dfsg.1-1ubuntu0.1~esm1 | USN-7204-1 |
| Ubuntu Pro 16.04 LTS | mutt | No fix yet | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | neomutt | 20241114-1.1 | openSUSE-SU-2024:14527-1 |
Advisories 3
- USN-7204-1 neomutt vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- openSUSE-SU-2024:14527-1 neomutt-20241114-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2024-3472 mutt: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jan 15, 2025