# CVE-2026-77619: Vector: Unauthenticated denial of service in the `logstash` source via unbounded memory allocation.

> Unauthenticated attackers can cause denial of service in Vector by sending crafted logstash frames that trigger excessive memory allocation.

- **Severity:** High 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 22 Sep 2026
- **Updated:** 22 Sep 2026
- **Also known as:** GHSA-rrfg-9487-mhp6

## What is CVE-2026-77619?

CVE-2026-77619 is a high-severity denial of service vulnerability in vectordotdev vector, published on 22 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Vector is a high-performance observability data pipeline. From 0.15.0 until 0.57.0, the logstash source reads a 32-bit compressed-frame length from the network and uses it to size an in-memory buffer without an upper bound. An unauthenticated remote peer that can reach the default 0.0.0.0:5044 listener can send a minimal frame declaring a multi-gigabyte payload, causing an excessive allocation that can abort Vector or invoke the host OOM killer. Because the allocation follows the declared length rather than bytes transmitted, the attacker has low resource cost, and process termination can halt log ingestion for every tenant on a shared pipeline. This issue is fixed in version 0.57.0.

Weakness: CWE-789 (Memory Allocation with Excessive Size Value), CWE-130 (Improper Handling of Length Parameter Inconsistency)

## Which versions are affected by CVE-2026-77619?


## How do I fix CVE-2026-77619?

No fix has been published for CVE-2026-77619 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-77619 being exploited?

There is no known exploitation of CVE-2026-77619 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-77619 and fix it if it is affected.

What it is: CVE-2026-77619 is a high-severity denial of service vulnerability in vectordotdev vector, published on 22 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-77619 in the wild and no public exploit code.

Affected product: vectordotdev vector. 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-2026-77619/ (Markdown: https://insights.sbomify.com/CVE-2026-77619/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-77619
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-77619
- OSV: https://osv.dev/vulnerability/CVE-2026-77619

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-77619/
Summaries are generated and may contain mistakes; the official description above is the record.