What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-11 · updated 2026-10-07
• Weakness: CWE-122

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 products

• Red Hat Enterprise Linux 10: all versions
• Red Hat Enterprise Linux 7: all versions
• Red Hat Enterprise Linux 8: all versions
• Red Hat Enterprise Linux 9: all versions
• Red Hat Hardened Images: all versions — fixed in 4.7.2-2.hum1

How to fix

Upgrade to a fixed version: Red Hat Hardened Images 4.7.2-2.hum1. Check the vendor advisory for mitigations.

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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