diff --git a/third_party/skia/src/gpu/ganesh/ops/AtlasTextOp.cpp b/third_party/skia/src/gpu/ganesh/ops/AtlasTextOp.cpp
--- a/third_party/skia/src/gpu/ganesh/ops/AtlasTextOp.cpp
+++ b/third_party/skia/src/gpu/ganesh/ops/AtlasTextOp.cpp
@@ -44,6 +44,8 @@
 #include "src/gpu/ganesh/text/GrAtlasManager.h"
 #include "src/text/gpu/DistanceFieldAdjustTable.h"
 #include "src/text/gpu/SubRunContainer.h"
+#include "src/text/gpu/VertexFiller.h"
+#include "src/core/SkDistanceFieldGen.h"

 #if defined(SK_GAMMA_APPLY_TO_A8)
 #include "include/private/base/SkCPUTypes.h"
@@ -256,6 +258,28 @@ std::tuple<const GrClip*, GrOp::Owner> AtlasTextOp::Make(SurfaceDrawContext* sdc
     if (glyphParams.isSDF) {
          auto [maskType, DFGPFlags, useGammaCorrectDistanceTable] =
                  calculate_sdf_parameters(*sdc, viewMatrix, glyphParams.isLCD, glyphParams.isAA);
+         // Bandaid fix: the SDF-LCD fragment shader samples the shared kA8
+         // glyph atlas at uv +/- offset where |offset| = (texels-per-device-
+         // pixel)/3, with no clamp to the glyph's atlas rect
+         // (GrAtlasedShaderHelpers.h append_multitexture_lookup_lcd). The
+         // glyph is packed with padding=0 and insetSrc(SK_DistanceFieldInset)
+         // so the shader may only safely reach SK_DistanceFieldInset texels
+         // outside the inset rect. The Slug's creationMatrix is deserialized
+         // unvalidated from a (potentially compromised) renderer; if it
+         // encodes a strong minification, the offset overshoots into a
+         // neighbouring glyph belonging to another origin. Drop LCD in that
+         // case (grayscale SDF does not perform the +/-offset taps).
+         if (maskType == AtlasTextOp::MaskType::kLCDDistanceField) {
+             const SkMatrix vd =
+                     subrun->vertexFiller().viewDifference(positionMatrix);
+             const float texelsPerDevPx =
+                     1.f / std::max(1e-6f, std::min(std::abs(vd.getScaleX()),
+                                                    std::abs(vd.getScaleY())));
+             if (texelsPerDevPx > 3.f * SK_DistanceFieldInset) {
+                 maskType = AtlasTextOp::MaskType::kGrayscaleDistanceField;
+                 DFGPFlags &= ~kUseLCD_DistanceFieldEffectFlag;
+             }
+         }
          op = GrOp::Make<AtlasTextOp>(rContext,
                                       maskType,
                                       true,