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.

CVSS 3.1

6.1CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:H

EPSS

0.1% chance of exploitation in the next 30 days; higher than 1% of CVEs (scores of 2026-10-25)

CWE

CWE-122

Published

2026-09-11

Modified

2026-10-07

Record from

the NVD, synced 2026-10-19

References

• https://access.redhat.com/errata/RHSA-2026:53467
• https://access.redhat.com/security/cve/CVE-2026-18495
• https://bugzilla.redhat.com/show_bug.cgi?id=2531414
• https://gitlab.com/libtiff/libtiff/-/merge_requests/729
• https://gitlab.com/libtiff/libtiff/-/tree/67fd283d276f09db54dc39b9ef7b979d4b45c4b1

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