Vulnerability 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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/timescale/timescaledb/commit/517c13e7cc6afadb4a7deaa7a5a5a290
- https://github.com/timescale/timescaledb/pull/10360
- https://www.vulncheck.com/advisories/timescaledb-out-of-bounds-read-information-
FAQ
What is CVE-2026-70634?
CVE-2026-70634 is a vulnerability with a CVSS score of 8.1 (HIGH). 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 v...
How severe is CVE-2026-70634?
CVE-2026-70634 has been rated HIGH with a CVSS base score of 8.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-70634?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.