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Graph/2309ab8e-4175-4d47-a881-ca20f20580ec

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PostScript Interpreter

2309ab8e-4175-4d47-a881-ca20f20580ec

PostScript Interpreter

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Updated5/1/2026

PageRank0.0000

Effectiveness0.000

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3 linked nodes

PERTAIN_TOReport

CVE-2020-15900: Integer Underflow in Ghostscript rsearch Operator

PERTAIN_TOProblem

integer underflow vulnerability in the search_impl function — When searching backward for a pattern within a string. Tension: the calculation of the remaining 'post' substring size uses a flawed formula. Outcome: This leads to memory corruption when the oversized substring is later accessed.

PERTAIN_TOSolution

The fix involves properly managing the operand stack after the push(2) operation — for backward searches. Tension: calculating the post size differently for forward vs. backward searches. Outcome: post_size = full_haystack_size - (count + pattern_size).

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