Description
A vulnerability in ClamAV versions prior to 0.100.2 could allow an attacker to cause a denial of service (DoS) condition. The vulnerability is due to an error related to the MEW unpacker within the "unmew11()" function (libclamav/mew.c), which can be exploited to trigger an invalid read memory access via a specially crafted EXE file.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Cisco | ClamAV | unspecified – < 0.100.2 | 0.100.2 |
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 | clamav | 0.100.2+dfsg-1 | — |
| Debian 13 | clamav | 0.100.2+dfsg-1 | — |
| Debian 12 | clamav | 0.100.2+dfsg-1 | — |
| Debian 8 | clamav | 0.100.2+dfsg-0+deb8u1 | DLA-1553-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | clamav | 0.100.2+dfsg-1ubuntu0.18.04.1 | USN-3789-1 |
| Ubuntu 16.04 LTS | clamav | 0.100.2+dfsg-1ubuntu0.16.04.1 | USN-3789-1 |
| Ubuntu 14.04 LTS | clamav | 0.100.2+dfsg-1ubuntu0.14.04.1 | USN-3789-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 | clamav | 0.100.2-3.6.4 | SUSE-SU-2018:3250-1 |
| SLES 12 SP3 | clamav | 0.100.2-33.18.1 | SUSE-SU-2018:3436-1 |
| SLES 12 SP2 | clamav | 0.100.2-33.18.1 | SUSE-SU-2018:3436-1 |
| SLES 12 SP1 | clamav | 0.100.2-33.18.1 | SUSE-SU-2018:3436-1 |
| SLES 12 | clamav | 0.100.2-33.18.1 | SUSE-SU-2018:3436-1 |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 11 SP4 | clamav | 0.100.2-0.20.18.1 | SUSE-SU-2018:3441-1 |
| SLES 11 SP3 | clamav | 0.100.2-0.20.18.1 | SUSE-SU-2018:3441-1 |
| SLES for SAP 12 SP3 | clamav | 0.100.2-33.18.1 | SUSE-SU-2018:3436-1 |
| SLES for SAP 12 SP2 | clamav | 0.100.2-33.18.1 | SUSE-SU-2018:3436-1 |
| SLES for SAP 12 SP1 | clamav | 0.100.2-33.18.1 | SUSE-SU-2018:3436-2 |
| SLES for SAP 11 SP4 | clamav | 0.100.2-0.20.18.1 | SUSE-SU-2018:3441-1 |
| SUSE OpenStack Cloud 7 | clamav | 0.100.2-33.18.1 | SUSE-SU-2018:3436-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | clamav | 0.100.2-0.20.18.1 | SUSE-SU-2018:3441-1 |
| SUSE Enterprise Storage 4 | clamav | 0.100.2-33.18.1 | SUSE-SU-2018:3436-1 |
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 | 0.100.2-r0 | — |
| Alpine v3.23 | clamav | 0.100.2-r0 | — |
| Alpine v3.22 | clamav | 0.100.2-r0 | — |
| Alpine v3.21 | clamav | 0.100.2-r0 | — |
| Alpine v3.20 | clamav | 0.100.2-r0 | — |
Show 14 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | clamav | 0.100.2-r0 | — |
| Alpine v3.18 | clamav | 0.100.2-r0 | — |
| Alpine v3.17 | clamav | 0.100.2-r0 | — |
| Alpine v3.16 | clamav | 0.100.2-r0 | — |
| Alpine v3.15 | clamav | 0.100.2-r0 | — |
| Alpine v3.14 | clamav | 0.100.2-r0 | — |
| Alpine v3.13 | clamav | 0.100.2-r0 | — |
| Alpine v3.12 | clamav | 0.100.2-r0 | — |
| Alpine v3.11 | clamav | 0.100.2-r0 | — |
| Alpine v3.10 | clamav | 0.100.2-r0 | — |
| Alpine v3.9 | clamav | 0.100.2-r0 | — |
| Alpine v3.8 | clamav | 0.100.2-r0 | — |
| Alpine v3.7 | clamav | 0.100.2-r0 | — |
| Alpine v3.6 | clamav | 0.100.2-r0 | — |
Advisories 8
- USN-3789-1 clamav vulnerability Ubuntu Security Notices (USN) · Apr 22, 2026
- DLA-1553-1 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-2018:3441-1 Security update for clamav SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:3436-1 Security update for clamav SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:3436-2 Security update for clamav SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:3250-1 Security update for clamav SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2025-0249 ClamAV: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Feb 3, 2025
References
- [debian-lts-announce] 20181024 [SECURITY] [DLA 1553-1] clamav security update mailing-list
- https://bugzilla.clamav.net/show_bug.cgi?id=12170
- 83000 third-party-advisory
- USN-3789-2 vendor-advisory
- USN-3789-1 vendor-advisory
- https://www.flexera.com/company/secunia-research/advisories/SR-2018-23.html
- GLSA-201904-12 vendor-advisory