# CVE-2026-70634: TimescaleDB 2.29.1 Out-of-Bounds Read Information Disclosure via Dictionary Compression Reverse Iterator

> CVE-2026-70634: TimescaleDB 2.29.1 Out-of-Bounds Read Information Disclosure via Dictionary Compression Reverse Iterator. CVSS 8.1 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-70634
Last updated: 2026-10-24T15:10:00Z

- Published: 2026-08-06 16:53 UTC · Updated: 2026-10-24 15:10 UTC · Assigner: VulnCheck
- CVSS: 8.1 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
- EPSS: 0.53%, 45th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-125, CWE-129

## 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.

## Affected vendors and products

- timescale: timescaledb

## Tracked companies

- [Timescale (Tiger Data)](https://rewindex.com/company/timescale-tiger-data.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-70634)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-70634)
- [https://github.com/timescale/timescaledb/commit/517c13e7cc6afadb4a7deaa7a5a5a29065e5b5a3](https://github.com/timescale/timescaledb/commit/517c13e7cc6afadb4a7deaa7a5a5a29065e5b5a3)
- [https://github.com/timescale/timescaledb/pull/10360](https://github.com/timescale/timescaledb/pull/10360)
- [https://www.vulncheck.com/advisories/timescaledb-out-of-bounds-read-information-disclosure-via-dictionary-compression-reverse-iterator](https://www.vulncheck.com/advisories/timescaledb-out-of-bounds-read-information-disclosure-via-dictionary-compression-reverse-iterator)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-70634 · Markdown: https://rewindex.com/cve/CVE-2026-70634.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-70634 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:11:15.324Z