Description
heap OOB write in convert_file_from_to() via a crafted Content-Type header allows attacker to OOB write when email is used as a template.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| mutt | mutt | ≤ 2.4.2 | — |
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 | 2.4.1-1.1 | — |
| Debian 13 | mutt | 2.2.13-1+deb13u2 | — |
| Debian 12 | mutt | 2.2.12-0.1~deb12u2 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | mutt | No fix yet | — |
| Ubuntu 26.04 LTS | mutt | No fix yet | — |
| Ubuntu 24.04 LTS | mutt | No fix yet | — |
| Ubuntu 22.04 LTS | mutt | No fix yet | — |
| Ubuntu 20.04 LTS | mutt | No fix yet | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 18.04 LTS | mutt | No fix yet | — |
| Ubuntu Pro 16.04 LTS | mutt | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | mutt | 2.2.14-150600.3.9.1 | SUSE-SU-2026:4857-1 |
| SLES 15 SP6 | mutt | 2.2.14-150600.3.9.1 | SUSE-SU-2026:4857-1 |
| SLES 15 SP5 | mutt | 1.10.1-150000.3.32.1 | SUSE-SU-2026:4818-1 |
| SLES 15 SP4 | mutt | 1.10.1-150000.3.32.1 | SUSE-SU-2026:4818-1 |
| SLES 12 SP5 | mutt | 1.10.1-55.36.1 | SUSE-SU-2026:4685-1 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | mutt | 2.2.16-160000.3.1 | SUSE-SU-2026:24242-1 |
| SLES for SAP 15 SP6 | mutt | 2.2.14-150600.3.9.1 | SUSE-SU-2026:4857-1 |
| SLES for SAP 15 SP5 | mutt | 1.10.1-150000.3.32.1 | SUSE-SU-2026:4818-1 |
| SLES for SAP 15 SP4 | mutt | 1.10.1-150000.3.32.1 | SUSE-SU-2026:4818-1 |
| SLES 16.0 | mutt | 2.2.16-160000.3.1 | SUSE-SU-2026:24242-1 |
| SLE HPC 15 SP5 | mutt | 1.10.1-150000.3.32.1 | SUSE-SU-2026:4818-1 |
| SLE HPC 15 SP4 | mutt | 1.10.1-150000.3.32.1 | SUSE-SU-2026:4818-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | mutt | 2.4.2-2.1 | openSUSE-SU-2026:12094-1 |
| openSUSE Leap 16.0 | mutt | 2.2.16-160000.3.1 | openSUSE-SU-2026:22099-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | mutt | 2.3.2-r1 | — |
| Alpine v3.23 | mutt | 2.2.16-r1 | — |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | mutt | No fix yet | — |
Advisories 7
- WID-SEC-2026-3866 mutt: Schwachstelle ermöglicht Manipulation von Daten BSI CERT-Bund (WID) · Nov 12, 2026
- SUSE-SU-2026:4857-1 Security update for mutt SUSE / openSUSE Security Updates · Oct 22, 2026
- SUSE-SU-2026:4818-1 Security update for mutt SUSE / openSUSE Security Updates · Oct 21, 2026
- SUSE-SU-2026:24242-1 Security update for mutt SUSE / openSUSE Security Updates · Oct 21, 2026
- openSUSE-SU-2026:22099-1 Security update for mutt SUSE / openSUSE Security Updates · Oct 19, 2026
- SUSE-SU-2026:4685-1 Security update for mutt SUSE / openSUSE Security Updates · Oct 16, 2026
- openSUSE-SU-2026:12094-1 mutt-2.4.2-2.1 on GA media SUSE / openSUSE Security Updates · Oct 10, 2026