Description
HuffmanTree_makeFromFrequencies in lodepng.c in LodePNG through 2019-09-28, as used in WinPR in FreeRDP and other products, has a memory leak because a supplied realloc pointer (i.e., the first argument to realloc) is also used for a realloc return value.
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 12 | freerdp2 | 2.0.0~git20190204.1.2693389a+dfsg1-2 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | freerdp | No fix yet | — |
| Ubuntu 16.04 LTS | freerdp | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP1 | freerdp | 2.0.0~rc4-10.4.1 | SUSE-SU-2019:3079-1 |
| SLES 15 | freerdp | 2.0.0~rc4-3.10.1 | SUSE-SU-2019:3078-1 |
| SLES 12 SP5 | freerdp | 2.0.0~git.1463131968.4e66df7-12.11.1 | SUSE-SU-2019:3077-1 |
| SLES 12 SP4 | freerdp | 2.0.0~git.1463131968.4e66df7-12.11.1 | SUSE-SU-2019:3077-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.1 | freerdp | 2.0.0~rc4-lp151.5.3.1 | openSUSE-SU-2019:2608-1 |
| openSUSE Leap 15.0 | freerdp | 2.0.0~rc4-lp150.10.1 | openSUSE-SU-2019:2604-1 |
Advisories 5
- openSUSE-SU-2019:2604-1 Security update for freerdp SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:3079-1 Security update for freerdp SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:3077-1 Security update for freerdp SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:3078-1 Security update for freerdp SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2019:2608-1 Security update for freerdp SUSE / openSUSE Security Updates · May 7, 2025