fix: heap buffer overflow in acmp pm#3545
Merged
airween merged 3 commits intoowasp-modsecurity:v2/masterfrom Apr 20, 2026
Merged
fix: heap buffer overflow in acmp pm#3545airween merged 3 commits intoowasp-modsecurity:v2/masterfrom
airween merged 3 commits intoowasp-modsecurity:v2/masterfrom
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Pull request overview
This PR addresses a potential heap buffer overflow in the ACMP (Aho–Corasick) pattern insertion path by ensuring allocations and copies respect the provided pattern length rather than relying on C-string semantics.
Changes:
- Fix prefix buffer allocation for trie nodes to allocate based on the current depth (
i) rather thanstrlen(pattern). - Fix full-pattern storage to allocate and copy using the explicit
length(viamemcpy+ terminator) instead ofstrlen/strcpy.
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theseion
requested changes
Apr 20, 2026
Co-authored-by: Max Leske <250711+theseion@users.noreply.github.com>
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theseion
approved these changes
Apr 20, 2026
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what
This PR fixes a possible heap buffer overflow in ACMP (Aho Corasick) pattern matching function.
why
See #3544 for details - same changes for v2.