diff --git a/itext/itext.sign/itext/signatures/validation/v1/SignatureValidator.cs b/itext/itext.sign/itext/signatures/validation/v1/SignatureValidator.cs
index ccc5011bea..29164ce9e9 100644
--- a/itext/itext.sign/itext/signatures/validation/v1/SignatureValidator.cs
+++ b/itext/itext.sign/itext/signatures/validation/v1/SignatureValidator.cs
@@ -295,8 +295,9 @@ private ValidationReport Validate(String signatureName) {
             foreach (String fieldName in signatureNames) {
                 ValidationReport subReport = new ValidationReport();
                 try {
-                    using (PdfDocument doc = new PdfDocument(new PdfReader(util.ExtractRevision(fieldName)), new DocumentProperties
-                        ().SetEventCountingMetaInfo(metaInfo))) {
+                    using (PdfDocument doc = new PdfDocument(new PdfReader(util.ExtractRevision(fieldName)).SetStrictnessLevel
+                        (PdfReader.StrictnessLevel.CONSERVATIVE), new DocumentProperties().SetEventCountingMetaInfo(metaInfo))
+                        ) {
                         subReport.Merge(ValidateLatestSignature(doc));
                     }
                 }
diff --git a/port-hash b/port-hash
index 5cce292597..2571da3b88 100644
--- a/port-hash
+++ b/port-hash
@@ -1 +1 @@
-9edc3b01ab28f67c9c46fdfeec48979abad3fd26
+a06646c229f7e94041f4b6c778397fd4af03c1f3