Bug 2512223 (CVE-2026-70635)

Summary: CVE-2026-70635 timescaledb: TimescaleDB: Denial of Service and data integrity issues via crafted dictionary decompression input
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
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Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in TimescaleDB. Authenticated attackers with direct data manipulation language (DML) access to a compressed hypertable can exploit an out-of-bounds read vulnerability. By supplying a specially crafted Simple8b selector-11 value, attackers can bypass index validation checks during bulk text dictionary decompression. This can lead to query-result integrity failures, incorrect aggregation output, or cause the backend to crash, resulting in a Denial of Service (DoS).
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Bug Depends On: 2521840, 2521841    
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Description OSIDB Bzimport 2026-08-06 22:23:09 UTC 
TimescaleDB through 2.29.1, fixed in commit 517c13e, contains an out-of-bounds read vulnerability that allows authenticated attackers to cause query-result integrity failures or backend crashes by supplying a crafted Simple8b selector-11 value, which is stored in the signed int16 Arrow dictionary-index type and bypasses index validation checks in bulk text dictionary decompression. Attackers with direct DML access to a non-frozen physical compressed hypertable relation can trigger an out-of-bounds read before the base of the live offsets array through the VectorAgg single-text hashing strategy, resulting in incorrect aggregation output, backend SIGSEGV, or PostgreSQL crash recovery depending on build configuration.