CVE-2026-70633
MediumCVSS 6.5Exploitation Probability (EPSS)
Low risk41th percentile - higher than 41% of all known CVEs
Summary
In TimescaleDB through 2.29.1, fixed in commit 517c13e, there is an out-of-bounds read vulnerability in the Gorilla compression reverse row iterator that allows authenticated attackers to cause a denial of service by storing a crafted compressed datum with an internally inconsistent BitArray. Attackers with DML access to a compressed hypertable can trigger an unsigned integer wraparound in the reverse iterator bucket index computation, causing a read beyond the end of the bucket array, resulting in a SIGSEGV crash.
Risk Assessment
An authenticated attacker can repeatedly cause database crashes (denial of service), potentially disrupting availability of services relying on TimescaleDB.
Recommendation
Apply the fix from commit 517c13e or update TimescaleDB to a version containing the fix.
Other vulnerabilities in TimescaleDB
See all- CVE-2026-70635High
TimescaleDB through 2.29.1 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, resulting in incorrect aggregation output, backend SIGSEGV, or PostgreSQL crash recovery.
- CVE-2026-70634High
TimescaleDB through 2.29.1 contains an out-of-bounds read in the Dictionary compression reverse row iterator, where the reverse path does not validate the Simple8b index, allowing attackers with DML access to a physical compressed relation to disclose backend memory including the shared buffer pool as a normal column value. Attackers can store a crafted datum and run a reverse-order scan, leading to memory disclosure that SQL access control does not cover.
Original NVD description (English source)
TimescaleDB through 2.29.1, fixed in commit 517c13e, contains an out-of-bounds read vulnerability in the Gorilla compression reverse row iterator that allows authenticated attackers to cause a denial of service by storing a crafted compressed datum with an internally inconsistent BitArray. Attackers with DML access to a compressed hypertable can trigger an unsigned integer wraparound in the reverse iterator bucket index computation, causing a read beyond the end of the bucket array, resulting in a SIGSEGV crash that can be repeatedly triggered on each subsequent reverse-order scan.