UBUNTU-CVE-2026-122330
Dashboard / Vulnerabilities / UBUNTU-CVE-2026-122330
Summary:
Details: Blosc c-blosc2 before 3.5.0 contains a divide-by-zero vulnerability in blosc2_schunk_get_slice_buffer() in blosc/schunk.c that allows attackers to crash applications by supplying crafted frames with unchecked zero chunksize or blocksize values. Attackers can provide a malicious Blosc2 frame opened via blosc2_schunk_open() or blosc2_schunk_from_buffer() and read as a slice, raising SIGFPE and terminating the process.
References: https://ubuntu.com/security/CVE-2026-122330, https://www.cve.org/CVERecord?id=CVE-2026-122330, https://github.com/Blosc/c-blosc2, https://github.com/Blosc/c-blosc2/blob/v3.4.1/blosc/frame.c#L1214-L1227, https://github.com/Blosc/c-blosc2/blob/v3.4.1/blosc/schunk.c#L1662-L1700, https://github.com/Blosc/c-blosc2/commit/4fff1787408d94b895c6f9cb50f7925ad5919052, https://github.com/Blosc/c-blosc2/issues/834, https://hackmd.io/@haindpwn/c-blosc2-schunk-slice-divide-by-zero, https://www.vulncheck.com/advisories/blosc-c-blosc2-before-3.5.0-divide-by-zero-via-blosc2-schunk-get-slice-buffer, https://hackmd.io/@haindpwn/cve-2026-122330-c-blosc2-schunk-slice-divide-by-zero
Affected packages
Package
Name: c-blosc2
Purl: pkg:deb/ubuntu/c-blosc2?arch=source&distro=noble
Affected ranges
Type: ECOSYSTEM
Events:
