Description
LASzip through 3.5.0 contains an invalid free vulnerability in laszip_read_header() that allows attackers to free uninitialized heap pointers via truncated variable length record data. Attackers can supply a crafted LAS/LAZ file with an inflated VLR count that, when opened and destroyed through the C API, crashes the process and corrupts the heap.
References5
- github.com/LASzip/LASzip/blob/3.5.0/src/laszip_dll.cpp#L3967-L3…
- github.com/LASzip/LASzip/blob/3.5.0/src/laszip_dll.cpp#L497-L511
- github.com/LASzip/LASzip/commit/c9bfd3e68d65c84d513a2286ae06cbb…
- hackmd.io/@haind-pwn/laszip-vlr-uninitialized-free
- www.vulncheck.com/advisories/laszip-through-3.5.0-invalid-free-…
Metrics
- CVSS 3.1
-
6.3
MEDIUM
Score source: CNA
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:H - CVSS 4.0
-
5.8
MEDIUM
Score source: CNA
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - EPSS — exploit probability
- 0% percentile: 7 · as of 11 November 2026
- CWE
- CWE-824
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.