Description
A flaw was found in mbsync versions prior to 1.4.4. Due to inadequate handling of extremely large (>=2GiB) IMAP literals, malicious or compromised IMAP servers, and hypothetically even external email senders, could cause several different buffer overflows, which could conceivably be exploited for remote code execution.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | isync | isync 1.4.4 | — |
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 | isync | 1.4.4-1 | — |
| Debian 13 | isync | 1.4.4-1 | — |
| Debian 12 | isync | 1.4.4-1 | — |
| Debian 9 | isync | 1.2.1-2+deb9u1 | DLA-3066-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | isync | No fix yet | — |
| Ubuntu 26.04 LTS | isync | No fix yet | — |
| Ubuntu 25.10 | isync | No fix yet | — |
| Ubuntu 24.04 LTS | isync | No fix yet | — |
| Ubuntu 22.04 LTS | isync | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | isync | No fix yet | — |
| Ubuntu 18.04 LTS | isync | No fix yet | — |
| Ubuntu 16.04 LTS | isync | No fix yet | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | isync | 1.4.4-1.1 | openSUSE-SU-2024:11779-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | isync | 1.4.4-r0 | — |
| Alpine v3.23 | isync | 1.4.4-r0 | — |
| Alpine v3.22 | isync | 1.4.4-r0 | — |
| Alpine v3.21 | isync | 1.4.4-r0 | — |
| Alpine v3.20 | isync | 1.4.4-r0 | — |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | isync | 1.4.4-r0 | — |
| Alpine v3.18 | isync | 1.4.4-r0 | — |
| Alpine v3.17 | isync | 1.4.4-r0 | — |
| Alpine v3.16 | isync | 1.4.4-r0 | — |
| Alpine v3.15 | isync | 1.4.4-r0 | — |
Advisories 2
- DLA-3066-1 isync - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:11779-1 isync-1.4.4-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026