diff --git a/src/core/parser.js b/src/core/parser.js
index 088a26c6e..25a101f68 100644
--- a/src/core/parser.js
+++ b/src/core/parser.js
@@ -40,27 +40,23 @@ import { PredictorStream } from "./predictor_stream.js";
 import { RunLengthStream } from "./run_length_stream.js";
 
 const MAX_LENGTH_TO_CACHE = 1000;
-const MAX_ADLER32_LENGTH = 5552;
 
-function computeAdler32(bytes) {
-  const bytesLength = bytes.length;
-  if (
-    typeof PDFJSDev === "undefined" ||
-    PDFJSDev.test("!PRODUCTION || TESTING")
-  ) {
-    assert(
-      bytesLength < MAX_ADLER32_LENGTH,
-      'computeAdler32: Unsupported "bytes" length.'
-    );
+function getInlineImageCacheKey(bytes) {
+  const strBuf = [],
+    ii = bytes.length;
+  let i = 0;
+  while (i < ii - 1) {
+    strBuf.push((bytes[i++] << 8) | bytes[i++]);
   }
-  let a = 1,
-    b = 0;
-  for (let i = 0; i < bytesLength; ++i) {
-    // No modulo required in the loop if `bytesLength < 5552`.
-    a += bytes[i] & 0xff;
-    b += a;
+  // Handle an odd number of elements.
+  if (i < ii) {
+    strBuf.push(bytes[i]);
   }
-  return (b % 65521 << 16) | a % 65521;
+  // We purposely include the "raw" length in the cacheKey, to prevent any
+  // possible issues with hash collisions in the inline image cache.
+  // Here we also assume that `strBuf` is never larger than 8192 elements,
+  // please refer to the `bytesToString` implementation.
+  return ii + "_" + String.fromCharCode.apply(null, strBuf);
 }
 
 class Parser {
@@ -71,6 +67,7 @@ class Parser {
     this.recoveryMode = recoveryMode;
 
     this.imageCache = Object.create(null);
+    this._imageId = 0;
     this.refill();
   }
 
@@ -532,25 +529,19 @@ class Parser {
       default:
         length = this.findDefaultInlineStreamEnd(stream);
     }
-    let imageStream = stream.makeSubStream(startPos, length, dict);
 
     // Cache all images below the MAX_LENGTH_TO_CACHE threshold by their
-    // adler32 checksum.
+    // stringified content, to prevent possible hash collisions.
     let cacheKey;
-    if (length < MAX_LENGTH_TO_CACHE && dictLength < MAX_ADLER32_LENGTH) {
-      const imageBytes = imageStream.getBytes();
-      imageStream.reset();
-
+    if (length < MAX_LENGTH_TO_CACHE && dictLength > 0) {
       const initialStreamPos = stream.pos;
       // Set the stream position to the beginning of the dictionary data...
       stream.pos = lexer.beginInlineImagePos;
-      // ... and fetch the bytes of the *entire* dictionary.
-      const dictBytes = stream.getBytes(dictLength);
+      // ... and fetch the bytes of the dictionary *and* the inline image.
+      cacheKey = getInlineImageCacheKey(stream.getBytes(dictLength + length));
       // Finally, don't forget to reset the stream position.
       stream.pos = initialStreamPos;
 
-      cacheKey = computeAdler32(imageBytes) + "_" + computeAdler32(dictBytes);
-
       const cacheEntry = this.imageCache[cacheKey];
       if (cacheEntry !== undefined) {
         this.buf2 = Cmd.get("EI");
@@ -561,6 +552,7 @@ class Parser {
       }
     }
 
+    let imageStream = stream.makeSubStream(startPos, length, dict);
     if (cipherTransform) {
       imageStream = cipherTransform.createStream(imageStream, length);
     }
@@ -568,7 +560,7 @@ class Parser {
     imageStream = this.filter(imageStream, dict, length);
     imageStream.dict = dict;
     if (cacheKey !== undefined) {
-      imageStream.cacheKey = `inline_${length}_${cacheKey}`;
+      imageStream.cacheKey = `inline_img_${++this._imageId}`;
       this.imageCache[cacheKey] = imageStream;
     }
 
diff --git a/test/pdfs/.gitignore b/test/pdfs/.gitignore
index c0ef6527d..86fb8fc99 100644
--- a/test/pdfs/.gitignore
+++ b/test/pdfs/.gitignore
@@ -534,6 +534,7 @@
 !issue14415.pdf
 !issue14307.pdf
 !issue14497.pdf
+!bug1799927.pdf
 !issue14502.pdf
 !issue13211.pdf
 !issue14627.pdf
diff --git a/test/pdfs/bug1799927.pdf b/test/pdfs/bug1799927.pdf
new file mode 100644
index 000000000..2605ee54e
Binary files /dev/null and b/test/pdfs/bug1799927.pdf differ
diff --git a/test/test_manifest.json b/test/test_manifest.json
index 9a66ad1cf..73493c19f 100644
--- a/test/test_manifest.json
+++ b/test/test_manifest.json
@@ -5921,6 +5921,12 @@
        "annotations": true,
        "type": "eq"
     },
+    {  "id": "bug1799927",
+       "file": "pdfs/bug1799927.pdf",
+       "md5": "e6ad013c24e58e5b40c3bae50f04c8e8",
+       "rounds": 1,
+       "type": "eq"
+    },
     {  "id": "annotation-line-without-appearance-empty-Rect",
        "file": "pdfs/annotation-line-without-appearance-empty-Rect.pdf",
        "md5": "65f2d3ef80acfea637718c3fc66043b7",