1) Kindly define "serious"...
2) Kindly define "major"...
Also... why can't you ask the question you pose:
"When was the last time there was a serious vulnerability in major JPEG libs?"
...with the words "serious" and "major" removed, i.e.:
"When was the last time there was a vulnerability in JPEG libs?"
?
As that might be a far better question if the generation of insight is desired...
1) Kindly define "serious"...
2) Kindly define "major"...
Also... why can't you ask the question you pose:
"When was the last time there was a serious vulnerability in major JPEG libs?"
...with the words "serious" and "major" removed, i.e.:
"When was the last time there was a vulnerability in JPEG libs?"
?
As that might be a far better question if the generation of insight is desired...
?