Out-of-bounds Read in Timescale Timescaledb
CVE-2026-70635
TimescaleDB through 2.29.1, fixed in commit 517c13e, contains an out-of-bounds read vulnerability that allows authenticated attackers to cause query-result integrity failures or backend crashes by supplying a crafted Simple8b selector-11 value, which is stored in the signed int16 Arrow dictionary-index type and bypasses index validation checks in bulk text dictionary decompression. Attackers with direct DML access to a non-frozen physical compressed hypertable relation can trigger an out-of-bounds read before the base of the live offsets array through the VectorAgg single-text hashing strategy, resulting in incorrect aggregation output, backend SIGSEGV, or PostgreSQL crash recovery depending on build configuration.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H.
EPSS exploit prediction
EPSS: 0.004 (38.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 39th percentile — 38.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Timescale Timescaledb — versions 0, 517c13e7cc6afadb4a7deaa7a5a5a29065e5b5a3
Weakness classification (CWE)
References
- github.com/timescale/timescaledb/commit/517c13e7cc6afadb4a7deaa7a5a5a29065e5b5a3 (Patch, patch)
- github.com/timescale/timescaledb/pull/10360 (issue-tracking, Patch, Issue Tracking)
- www.vulncheck.com/advisories/timescaledb-out-of-bounds-read-dos-via-bulk-dictio… (Patch, Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-70635?
- CVE-2026-70635 is a high-severity vulnerability in Timescale Timescaledb, classified under Out-of-bounds Read. CVSS score: 7.1/10. Published 2026-08-06.
- How severe is CVE-2026-70635?
- High severity. CVSS v3 base score is 7.1 out of 10.