CVE-2026-119434

Description

Improper Handling of Highly Compressed Data (Data Amplification) vulnerability in silviucpp ezstd allows an attacker who supplies a zstd frame to ezstd:decompress_using_ddict/2 to exhaust memory and terminate the Erlang VM via a small frame that declares a very large content size. zstd_nif_decompress_using_ddict in c_src/ezstd_nif.cc reads the frame's declared content size with ZSTD_getFrameContentSize and passes it directly to enif_make_new_binary, without the 1 GiB MAX_BUFFER_SIZE check that ezstd:decompress/1 applies before allocating. A valid 65,550-byte frame of RLE blocks declaring 2 GiB is rejected by ezstd:decompress/1 but is fully allocated and decompressed by the dictionary path. The allocation happens inside a NIF, so when it exceeds the memory available to the VM the operating system kills the whole node rather than the calling process. This issue affects ezstd: from 1.0.5 before 1.2.5.

References

• https://cna.erlef.org/cves/CVE-2026-119434.html
• https://github.com/silviucpp/ezstd/commit/6730128b1d35eca02a2028671421471ff651f423
• https://github.com/silviucpp/ezstd/commit/e34f4a4f6dc18d990d1cece2d5fceef8e934a195
• https://github.com/silviucpp/ezstd/releases/tag/v1.2.5
• https://osv.dev/vulnerability/EEF-CVE-2026-119434