PYSEC-2026-3869 NLTK: Uncontrolled resource consumption in RecursiveDescentParser via ambiguous or left-recursive grammars

nltk.parse.RecursiveDescentParser and SteppingRecursiveDescentParser enumerate parses top-down with no bound on the number of recursive steps. A small, crafted context-free grammar makes a short input consume unbounded CPU and/or exhaust the Python recursion stack, pinning a process indefinitely ...

NLTK: Uncontrolled resource consumption in RecursiveDescentParser via ambiguous or left-recursive grammars

nltk.parse.RecursiveDescentParser and SteppingRecursiveDescentParser enumerate parses top-down with no bound on the number of recursive steps. A small, crafted context-free grammar makes a short input consume unbounded CPU and/or exhaust the Python recursion stack, pinning a process indefinitely ...

checkstyle:CheckstyleFuzzer: Security exception in com.puppycrawl.tools.checkstyle.grammar.java.JavaLanguageParser.expr

Project: https://github.com/checkstyle/checkstyle.git Detailed Report: https://oss-fuzz.com/testcase?key=5242131110035456 Project: checkstyle Fuzzing Engine: libFuzzer Fuzz Target: CheckstyleFuzzer Job Type: libfuzzerasancheckstyle Platform Id: linux Crash Type: Security exception Crash Address:...

SUSE CVE-2019-12760

A deserialization vulnerability exists in the way parso through 0.4.0 handles grammar parsing from the cache. Cache loading relies on pickle and, provided that an evil pickle can be written to a cache grammar file and that its parsing can be triggered, this flaw leads to Arbitrary Code Execution...

CVE-2019-12760

A deserialization vulnerability exists in the way parso through 0.4.0 handles grammar parsing from the cache. Cache loading relies on pickle and, provided that an evil pickle can be written to a cache grammar file and that its parsing can be triggered, this flaw leads to Arbitrary Code Execution...

PYSEC-2019-39

DISPUTED A deserialization vulnerability exists in the way parso through 0.4.0 handles grammar parsing from the cache. Cache loading relies on pickle and, provided that an evil pickle can be written to a cache grammar file and that its parsing can be triggered, this flaw leads to Arbitrary Code...

CVE-2019-12760

A deserialization vulnerability exists in the way parso through 0.4.0 handles grammar parsing from the cache. Cache loading relies on pickle and, provided that an evil pickle can be written to a cache grammar file and that its parsing can be triggered, this flaw leads to Arbitrary Code Execution...

CVE-2019-12760

A deserialization vulnerability exists in the way parso through 0.4.0 handles grammar parsing from the cache. Cache loading relies on pickle and, provided that an evil pickle can be written to a cache grammar file and that its parsing can be triggered, this flaw leads to Arbitrary Code Execution...

CVE-2019-12760

The CVE-2019-12760 entry describes a deserialization flaw in parso up to version 0.4.0, where grammar parsing from the cache uses pickle. If an attacker can write a malicious pickle to a cache grammar file and trigger parsing, Arbitrary Code Execution is possible. Note: multiple sources mark this...