Vulnerability CVE-2020-25725


Published: 2020-11-21

Description:
In Xpdf 4.02, SplashOutputDev::endType3Char(GfxState *state) SplashOutputDev.cc:3079 is trying to use the freed `t3GlyphStack->cache`, which causes an `heap-use-after-free` problem. The codes of a previous fix for nested Type 3 characters wasn't correctly handling the case where a Type 3 char referred to another char in the same Type 3 font.

 References:
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-25725
https://forum.xpdfreader.com/viewtopic.php?f=3&t=41915

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