CVE-2026-70634 TimescaleDB 2.29.1 Out-of-Bounds Read Information Disclosure via Dictionary Compression Reverse Iterator
Attackers with DML access can trigger an out-of-bounds read in TimescaleDB, disclosing backend memory including shared buffer pool contents.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-70634?
CVE-2026-70634 is a high-severity vulnerability in timescaledb, published on 6 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
TimescaleDB through 2.29.1, fixed in commit 517c13e, contains an out-of-bounds read in the Dictionary compression reverse row iterator (tsl/src/compression/algorithms/dictionary.c). The forward path validates the decoded index; the reverse path uses an assertion compiled out of release builds, leaving the 64-bit Simple8b index unvalidated and the read offset attacker-controlled. Attackers with DML access to a physical compressed relation can store a crafted datum and run a reverse-order scan. With a pass-by-value column type the out-of-bounds Datum is returned to the client as a normal column value, disclosing backend memory including the shared buffer pool, which SQL access control does not cover.
Which versions are affected by CVE-2026-70634?
It affects 1 product.
Products include Timescale Timescaledb.
How do I fix CVE-2026-70634?
No fix has been published for CVE-2026-70634 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-70634 being exploited?
There is no known exploitation of CVE-2026-70634 in the wild and no public exploit code.
Other vulnerabilities in timescaledb
- CVE-2026-29089 TimescaleDB uses untrusted search path during extension upgrade
- CVE-2023-25149 TimescaleDB has incorrect access control
- CVE-2022-24128 Privilege escalation in n/a
- CVE-2026-70633 TimescaleDB 2.29.1 Out-of-Bounds Read DoS via Gorilla Compression Reverse Iterator
- CVE-2026-70635 TimescaleDB 2.29.1 Out-of-Bounds Read DoS via Bulk Dictionary Decompression Negative Index
Sources
Also known as GHSA-mjw3-r56j-9698.