Description
ClamAV AntiVirus software versions 0.99.2 and prior contain a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to improper input validation checking mechanisms in mbox.c during certain mail parsing functions of the ClamAV software. An unauthenticated, remote attacker could exploit this vulnerability by sending a crafted email to the affected device. An exploit could trigger a NULL pointer dereference condition when ClamAV scans the malicious email, which may result in a DoS condition.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | ClamAV AntiVirus software versions 0.99.2 and prior | ClamAV AntiVirus software versions 0.99.2 and prior | — |
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 | clamav | 0.99.3~beta2+dfsg-1 | — |
| Debian 13 | clamav | 0.99.3~beta2+dfsg-1 | — |
| Debian 12 | clamav | 0.99.3~beta2+dfsg-1 | — |
| Debian 7 | clamav | 0.99.2+dfsg-0+deb7u4 | DLA-1261-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | clamav | 0.99.3+addedllvm-0ubuntu0.16.04.1 | USN-3550-1 |
| Ubuntu 14.04 LTS | clamav | 0.99.3+addedllvm-0ubuntu0.14.04.1 | USN-3550-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | clamav | 0.99.3-33.5.1 | SUSE-SU-2018:0255-1 |
| SLES 12 SP2 | clamav | 0.99.3-33.5.1 | SUSE-SU-2018:0255-1 |
| SLES 12 SP1 | clamav | 0.99.3-33.5.1 | SUSE-SU-2018:0255-1 |
| SLES 12 | clamav | 0.99.3-33.5.1 | SUSE-SU-2018:0255-1 |
| SLES 11 SP4 | clamav | 0.99.3-0.20.3.2 | SUSE-SU-2018:0254-1 |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 11 SP3 | clamav | 0.99.3-0.20.3.2 | SUSE-SU-2018:0254-1 |
| SLES for SAP 12 SP3 | clamav | 0.99.3-33.5.1 | SUSE-SU-2018:0255-1 |
| SLES for SAP 12 SP2 | clamav | 0.99.3-33.5.1 | SUSE-SU-2018:0255-1 |
| SLES for SAP 12 SP1 | clamav | 0.99.3-33.5.1 | SUSE-SU-2018:0255-1 |
| SLES for SAP 12 | clamav | 0.99.3-33.5.1 | SUSE-SU-2018:0255-1 |
| SLES for SAP 11 SP4 | clamav | 0.99.3-0.20.3.2 | SUSE-SU-2018:0254-1 |
| SUSE OpenStack Cloud 6 | clamav | 0.99.3-33.5.1 | SUSE-SU-2018:0255-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | clamav | 0.99.3-0.20.3.2 | SUSE-SU-2018:0254-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | clamav | 0.103.3-1.4 | openSUSE-SU-2024:10685-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | clamav | 0.99.3-r0 | — |
| Alpine v3.23 | clamav | 0.99.3-r0 | — |
| Alpine v3.22 | clamav | 0.99.3-r0 | — |
| Alpine v3.21 | clamav | 0.99.3-r0 | — |
| Alpine v3.20 | clamav | 0.99.3-r0 | — |
Show 12 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | clamav | 0.99.3-r0 | — |
| Alpine v3.18 | clamav | 0.99.3-r0 | — |
| Alpine v3.17 | clamav | 0.99.3-r0 | — |
| Alpine v3.16 | clamav | 0.99.3-r0 | — |
| Alpine v3.15 | clamav | 0.99.3-r0 | — |
| Alpine v3.14 | clamav | 0.99.3-r0 | — |
| Alpine v3.13 | clamav | 0.99.3-r0 | — |
| Alpine v3.12 | clamav | 0.99.3-r0 | — |
| Alpine v3.11 | clamav | 0.99.3-r0 | — |
| Alpine v3.10 | clamav | 0.99.3-r0 | — |
| Alpine v3.9 | clamav | 0.99.3-r0 | — |
| Alpine v3.8 | clamav | 0.99.3-r0 | — |
Advisories 5
- USN-3550-1 clamav vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DLA-1261-1 clamav - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:10685-1 clamav-0.103.3-1.4 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:0254-1 Security update for clamav SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:0255-1 Security update for clamav SUSE / openSUSE Security Updates · May 2, 2025