# CVE-2026-70634

## Summary

- **CVE ID:** CVE-2026-70634
- **Severity:** HIGH
- **CVSS Score:** 8.1 (CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-129, CWE-125, CWE-129, CWE-125
- **Published:** Aug 6, 2026
- **Last Modified:** Aug 14, 2026

## 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 Products

- timescale — timescaledb (0)
- timescale — timescaledb (517c13e7cc6afadb4a7deaa7a5a5a29065e5b5a3)

## References

- [CNA](https://github.com/timescale/timescaledb/pull/10360)
- [CNA](https://github.com/timescale/timescaledb/commit/517c13e7cc6afadb4a7deaa7a5a5a29065e5b5a3)
- [CNA](https://www.vulncheck.com/advisories/timescaledb-out-of-bounds-read-information-disclosure-via-dictionary-compression-reverse-iterator)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.40%
- **EPSS Percentile:** 33.5

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._