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Vulnerability · Published Sep 11, 2026 · Assigned by redhat

CVE-2026-18495Libtiff: libtiff: heap-buffer overflow via numeric truncation in the jpeg raw passthrough

Medium 6.1

In plain English

A medium-severity heap buffer overflow in Red Hat Ceph Storage 4 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 2% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.1Medium
Exploit odds (30 days)0.1%top 98.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12tiffno fix listedDEBIAN-CVE-2026-18495
Debian:13tiffno fix listedDEBIAN-CVE-2026-18495
Debian:14tiff4.7.1-1DEBIAN-CVE-2026-18495
Ubuntu:22.04:LTSneuronno fix listedUBUNTU-CVE-2026-18495
Ubuntu:26.10qtwebengine-opensource-srcno fix listedUBUNTU-CVE-2026-18495
Ubuntu:22.04:LTStiffno fix listedUBUNTU-CVE-2026-18495
Ubuntu:24.04:LTStiffno fix listedUBUNTU-CVE-2026-18495
Ubuntu:26.04:LTStiffno fix listedUBUNTU-CVE-2026-18495

Affected products (as reported)

VendorProductVersions
Red Hat Red Hat Hardened Images see references
Red Hat Red Hat Ceph Storage 4 see references
Red Hat Red Hat Ceph Storage 6 see references
Red Hat Red Hat Ceph Storage 7 see references
Red Hat Red Hat Ceph Storage 8 see references
Red Hat Red Hat Ceph Storage 9 see references
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 6 see references
Red Hat Red Hat Enterprise Linux 7 see references
Red Hat Red Hat Enterprise Linux 7 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 9 see references
Red Hat Red Hat Enterprise Linux 9 see references
Red Hat Red Hat Enterprise Linux 9 see references
Red Hat Red Hat Hardened Images see references

Weakness: CWE-122 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:H

References