Buffer overflow in Red Hat Ceph Storage 4

CVE-2026-18495

A flaw was found in libtiff. A heap-buffer overflow vulnerability exists in the `tiff2pdf` utility due to an integer truncation error when processing crafted BigTIFF files. An attacker can provide a specially crafted BigTIFF file, causing a 64-bit `StripByteCounts` value to be truncated to a 32-bit integer. This leads to an undersized memory allocation and a subsequent out-of-bounds memory copy, resulting in a crash and severe memory corruption.

Vulnerability class: Buffer Overflow

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:H.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-18495?
CVE-2026-18495 is a medium-severity vulnerability in Red Hat Ceph Storage 4, classified under Heap-based Buffer Overflow. CVSS score: 6.1/10. Published 2026-09-11.
How severe is CVE-2026-18495?
Medium severity. CVSS v3 base score is 6.1 out of 10.