CVE-2018-18689

https://notcve.org/view.php?id=CVE-2018-18689

07 Jan 2021 — The Portable Document Format (PDF) specification does not provide any information regarding the concrete procedure of how to validate signatures. Consequently, a Signature Wrapping vulnerability exists in multiple products. An attacker can use /ByteRange and xref manipulations that are not detected by the signature-validation logic. This affects Foxit Reader before 9.4 and PhantomPDF before 8.3.9 and 9.x before 9.4. It also affects eXpert PDF 12 Ultimate, Expert PDF Reader, Nitro Pro, Nitro Reader, PDF Arch... • https://pdf-insecurity.org/signature/evaluation_2018.html • CWE-347: Improper Verification of Cryptographic Signature •