EUVD-2026-76166
GHSA-6x88-8xw5-p2gw
Severity by source
AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:H
Local execution of tiff2pdf on a crafted file (AV:L, UI:R); heap overflow yields limited info/write exposure and high availability impact.
Primary rating from Vendor (redhat).
CVSS VectorNVD
Lifecycle Timeline
2DescriptionNVD
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.
AnalysisAI
Heap buffer overflow in the libtiff tiff2pdf utility allows local attackers to cause severe memory corruption and application crashes by supplying a crafted BigTIFF file. The root cause is an integer truncation: a 64-bit StripByteCounts value is silently narrowed to 32 bits, producing an undersized heap allocation that a subsequent memory copy overflows. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the target user explicitly invoke the `tiff2pdf` utility against an attacker-supplied BigTIFF file; the vulnerability is specific to the BigTIFF format variant (not standard TIFF), meaning the crafted file must carry BigTIFF magic bytes and a pathologically large `StripByteCounts` field. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:H yields a moderate score of 6.1, accurately reflecting that exploitation requires local access, low-privilege credentials, and active user interaction - a user must run `tiff2pdf` against a malicious file. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | For Red Hat systems, apply the vendor-released patch documented in advisory RHSA-2026:53467 (https://access.redhat.com/errata/RHSA-2026:53467) using standard package management (`dnf update libtiff`). … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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