CVE-2026-18495CWE-122

CVE-2026-18495

Medium · published September 11, 2026

CVSS v3.1
6.1
EPSS
0%
Percentile
1.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.1 · MEDIUM
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:H
CVSS v4.0
Not supplied
EPSS
0.00117 · 1.6th percentile
Weakness
CWE-122 · Heap-based Buffer Overflow
Published
2026-09-11T22:16Z
References (5)
https://bugzilla.redhat.com/show_bug.cgi?id=2531414 · [email protected]https://access.redhat.com/errata/RHSA-2026:53467 · [email protected]https://access.redhat.com/security/cve/CVE-2026-18495 · [email protected]https://gitlab.com/libtiff/libtiff/-/merge_requests/729 · [email protected]https://gitlab.com/libtiff/libtiff/-/tree/67fd283d276f09db54dc39b9ef7b979d4b45c4b1 · [email protected]
EPSS history
Timeline
  • 13 SEP 03:21Z
    EPSS moved — → 0%
    epss
  • 11 SEP 17:41Z
    Libtiff: libtiff: heap-buffer overflow via numeric truncation in the jpeg raw passthrough
    cvelistv5