Description
Heap buffer overflow in Clickhouse's LZ4 compression codec when parsing a malicious query. There is no verification that the copy operations in the LZ4::decompressImpl loop and especially the arbitrary copy operation wildCopy<copy_amount>(op, ip, copy_end), don’t exceed the destination buffer’s limits.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| yandex | clickhouse | unspecified – < 21.10.2.15-stable | 21.10.2.15-stable |
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 | clickhouse | 18.16.1+ds-7.3 | — |
| Debian 10 | clickhouse | 18.16.1+ds-4+deb10u1 | DLA-3176-1 |
Advisories 1
- DLA-3176-1 clickhouse - security update Debian Security (DSA / DLA) · Mar 9, 2026