GHSA-88fw-v6x4-3f58: Spring Data: Unbounded property-path cache keyed by externally-supplied path string

src/main/java/org/springframework/data/mapping/context/PersistentPropertyPathFactory.java:175 · Unbounded Resource Allocation (Algorithmic DoS) Impact When a consuming module routes user-supplied dot-paths (sort parameters, projection paths, PATCH paths) through MappingContext.getPersistentPropertyPath(String, Class), each distinct string — including invalid ones — is cached forever. A remote attacker can send millions of requests with unique ?sort=aaaa<n> values and grow the heap until the service OOMs. Description PersistentPropertyPathFactory.propertyPaths (line 53) is a ConcurrentHashMap<TypeAndPath, PathResolution> populated by getPotentiallyCachedPath() (line 174-177) via computeIfAbsent. The key is (TypeInformation, rawPathString). Crucially, unresolvable paths are also cached (as PathResolution.unresolved, line 204) so that the same InvalidPersistentPropertyPath can be re-thrown — meaning every distinct garbage string an attacker sends creates a permanent entry. There is no eviction. This is reachable from AbstractMappingContext.getPersistentPropertyPath(String, Class) (AbstractMappingContext.java:345), which Spring Data REST and several store query mappers call with HTTP-request-derived sort/filter property names. By contrast, the sibling SimplePropertyPath.cache was already hardened to use ConcurrentReferenceHashMap (soft refs); this cache was not given the same treatment. Exploit scenario Against a Spring Data REST endpoint, an attacker scripts GET /things?sort=<random-40-char-string> in a loop. Each request fails fast with InvalidPersistentPropertyPath, but each distinct random string leaves behind a TypeAndPath key, a PathResolution object holding the split segments list, and the source string in the map. After ~10M requests the JVM OOMs. Preconditions - A downstream component (Spring Data REST, a store-specific QueryMapper, or application code) passes externally-supplied strings to MappingContext.getPersistentPropertyPath(String, ...) - No ups