# CVE-2026-70635: TimescaleDB 2.29.1 Out-of-Bounds Read DoS via Bulk Dictionary Decompression Negative Index

> Authenticated attackers can cause database crashes or incorrect data via out-of-bounds read in TimescaleDB bulk dictionary decompression.

- **Severity:** High 7.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 6 Aug 2026
- **Updated:** 14 Aug 2026
- **Also known as:** GHSA-55x3-g2hr-288r

## What is CVE-2026-70635?

CVE-2026-70635 is a high-severity memory corruption vulnerability in timescaledb, published on 6 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

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.

Weakness: CWE-129 (Improper Validation of Array Index), CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2026-70635?

It affects 1 product.


Products: Timescale Timescaledb.

## How do I fix CVE-2026-70635?

No fix has been published for CVE-2026-70635 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-70635 being exploited?

There is no known exploitation of CVE-2026-70635 in the wild and no public exploit code.

## Other vulnerabilities in timescaledb

- [CVE-2026-29089](https://insights.sbomify.com/CVE-2026-29089/): TimescaleDB uses untrusted search path during extension upgrade (high 8.8)
- [CVE-2023-25149](https://insights.sbomify.com/CVE-2023-25149/): TimescaleDB has incorrect access control (high 8.8)
- [CVE-2022-24128](https://insights.sbomify.com/CVE-2022-24128/): Privilege escalation in n/a (high 8.0)
- [CVE-2026-70634](https://insights.sbomify.com/CVE-2026-70634/): TimescaleDB 2.29.1 Out-of-Bounds Read Information Disclosure via Dictionary Compression Reverse Iterator (high 7.2)
- [CVE-2026-70633](https://insights.sbomify.com/CVE-2026-70633/): TimescaleDB 2.29.1 Out-of-Bounds Read DoS via Gorilla Compression Reverse Iterator (high 7.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-70635 and fix it if it is affected.

What it is: CVE-2026-70635 is a high-severity memory corruption vulnerability in timescaledb, published on 6 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-70635 in the wild and no public exploit code.

Affected product: timescaledb. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-70635/ (Markdown: https://insights.sbomify.com/CVE-2026-70635/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-70635
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-70635
- OSV: https://osv.dev/vulnerability/CVE-2026-70635

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-70635/
Summaries are generated and may contain mistakes; the official description above is the record.