Description
DCMTK through 3.6.6 does not handle string copy properly. Sending specific requests to the dcmqrdb program, it would query its database and copy the result even if the result is null, which can incur a head-based overflow. An attacker can use it to launch a DoS attack.
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 | dcmtk | 3.6.7-1 | — |
| Debian 13 | dcmtk | 3.6.7-1 | — |
| Debian 12 | dcmtk | 3.6.7-1 | — |
| Debian 11 | dcmtk | 3.6.5-1+deb11u1 | DLA-4038-1 |
| Debian 10 | dcmtk | 3.6.4-2.1+deb10u1 | DLA-3847-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | dcmtk | 3.6.4-2.1ubuntu0.1 | USN-7010-1 |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 24.04 LTS | dcmtk | 3.6.7-9.1ubuntu0.1~esm1 | USN-7010-1 |
| Ubuntu Pro 22.04 LTS | dcmtk | 3.6.6-5ubuntu0.1~esm1 | USN-7010-1, USN-5882-1 |
| Ubuntu Pro 20.04 LTS | dcmtk | 3.6.4-2.1ubuntu0.1~esm1 | USN-5882-1 |
| Ubuntu Pro 18.04 LTS | dcmtk | 3.6.2-3ubuntu0.1~esm1 | USN-7010-1, USN-5882-1 |
| Ubuntu Pro 16.04 LTS | dcmtk | 3.6.1~20150924-5ubuntu0.1~esm1 | USN-7010-1, USN-5882-1 |
Advisories 4
- USN-5882-1 dcmtk vulnerabilities Ubuntu Security Notices (USN) · Aug 31, 2026
- USN-7010-1 dcmtk vulnerabilities Ubuntu Security Notices (USN) · Jun 25, 2026
- DLA-3847-1 dcmtk - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-4038-1 dcmtk - security update Debian Security (DSA / DLA) · Mar 9, 2026