Security context
What an agent needs to avoid regressing past fixes and find the next vuln in this repo.
rust-lang/regex
master @ 468fc64
9
Fixes
1
CVEs
HIGH
Peak severity
33.3%
Coverage
Highlights
Denial of Service: 8 prior fixes. Scrutinize any change in this area.
regex-automata/src/dfa/dense.rs: most-fixed (3 issues). Treat as high-risk during review.
1 high-severity fix in this history; regressions here are high-impact.
Recurring patterns
The bug types that recur here, drawn from past fixes, not open vulnerabilities.
Memory Safety: Inconsistent implementations of the AsRef trait on search buffers can lead to mismatched length expectations, causing out-of-bounds slice accesses and undefined behavior. Developers must guarantee that slice references are resolved only once to ensure consistency.
Denial of Service: Deeply nested abstract syntax trees (ASTs) or high-level intermediate representations (HIRs) can exhaust the thread stack during compilation or drop sequences, leading to crashes. Implementing recursion depth limits and iterative drop strategies is necessary to prevent stack exhaustion.
Denial of Service: Deserializing unvalidated or corrupted dense DFA byte arrays can lead to out-of-bounds panics due to mismatched transition table boundaries, invalid start states, or incorrect accelerator index configurations. Deserializers must systematically validate state structures.