# CVE-2026-70634: TimescaleDB through 2.29.1, fixed in commit 517c13e, contains an out-of-bounds read in the Dictionary compression…

Source: https://junglewise.ai/threats/cve-2026-70634-timescaledb-through-2-29-1-fixed-in-commit-517c13e-contains-an  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-06  
License: CC BY 4.0 with a link back

CVE-2026-70634 · Severity: high · CVSS 8.1 · Published 2026-08-06

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.

Technologies: [Timescaledb](https://junglewise.ai/threats/technologies/timescaledb). Vendors: [Timescale](https://junglewise.ai/threats/vendors/timescale).

## Quick answers

**Is CVE-2026-70634 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-70634 being exploited in the wild.

**How severe is CVE-2026-70634?** High severity, with a CVSS score of 8.1, published 6 August 2026.

**Which products and versions are affected?** Timescaledb. The advisory does not name versions.

**Is there a fix for CVE-2026-70634?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**Am I affected by CVE-2026-70634?** Check whether you run Timescaledb. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Timescaledb

## Related threats

- [TimescaleDB through 2.29.1, fixed in commit 517c13e, contains an out-of-bounds read vulnerability that allows…](https://junglewise.ai/threats/cve-2026-70635-timescaledb-through-2-29-1-fixed-in-commit-517c13e-contains-an)
- [TimescaleDB through 2.29.1, fixed in commit 517c13e, contains an out-of-bounds read vulnerability in the Gorilla…](https://junglewise.ai/threats/cve-2026-70633-timescaledb-through-2-29-1-fixed-in-commit-517c13e-contains-an)