Medium [CVE-2026-18495] Libtiff: libtiff: heap-buffer overflow via numeric truncation in the jpeg raw passthrough
This medium-severity Red Hat Linux advisory covers CVE-2026-18495 affecting Red Hat Hardened Images.
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Summary
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 flaw arises from an integer truncation during strip length calculation, resulting in an undersized buffer. Exploitation requires local access and user interaction, such as opening a malicious file.
Red Hat severity: Moderate — CVSS 6.1 (CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:H). Weakness: CWE-122.
Affected Red Hat products: Red Hat Hardened Images. Under investigation: Red Hat Ceph Storage 4; Red Hat Ceph Storage 6; Red Hat Ceph Storage 7; Red Hat Ceph Storage 8; Red Hat Ceph Storage 9; Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9.
Red Hat fixing advisory: RHSA-2026:53467.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
- libtiff-main-4.7.2-2.hum1
- RHSA-2026:53467
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Mitigation
Upgrade to a fixed release: libtiff-main-4.7.2-2.hum1, RHSA-2026:53467. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
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