Adobe had said that it would take until 11 March to build a patch for the flaw in Adobe Reader and Acrobat, which allows remote code execution on targeted systems. The firm said that hackers were already using the attack.
But Lurene Grenier, a senior research engineer with the Sourcefire Vulnerability Research Team, has created her own patch, which she says should work on Windows systems.
"People seemed a bit worried about the Adobe Reader bug, so I figured I'd take a bit of time this morning and create a home-brew patch for people to protect themselves until 11 March rolls around," she wrote on the company blog.
"I made this patch using only windbg and a crappy hex editor because I'm at home now. It may not prevent all attacks on jbig2 - it WILL prevent all current attacks using the method I described, but there may be others. No warranty expressed or implied, etc etc."
The patch will be something of an embarrassment to Adobe, which has been criticised by some for its slow response to the threat.
Cotton seedling freezes to death as Chang'e-4 shuts down for the Moon's 14-day lunar night
Fortnite easily out-earns PUBG, Assassin's Creed Odyssey and Red Dead Redemption 2 in 2018
Meteor showers as a service will be visible for about 100 kilometres in all directions
Saturn's rings only formed in the past 100 million years, suggests analysis of Cassini space probe data
New findings contradict conventional belief that Saturn's rings were formed along with the planet about 4.5 billion years ago