# CVE-2026-15969: CVE-2026-15969

> Unauthenticated attackers can execute arbitrary code via crafted pickle payloads in SGLang due to incomplete deserialization protections.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 30 Jul 2026
- **Updated:** 31 Jul 2026
- **Also known as:** GHSA-2wvm-gjg7-5jfm, GHSA-359v-m36h-r94v

## What is CVE-2026-15969?

CVE-2026-15969 is a critical unsafe deserialization vulnerability in SGLang, published on 30 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

SGLang contains an unauthenticated RCE in /load_lora_adapter_from_tensors via bypass of SafeUnpickler’s incomplete denylist, allowing arbitrary command execution through crafted base64-encoded pickle payloads.

Weakness: CWE-502 (Deserialization of Untrusted Data)

## Which versions are affected by CVE-2026-15969?

It affects 1 product.


Products: Lmsys Sglang.

## How do I fix CVE-2026-15969?

No fix has been published for CVE-2026-15969 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-15969 being exploited?

There is no known exploitation of CVE-2026-15969 in the wild and no public exploit code.

## Other vulnerabilities in SGLang

- [CVE-2026-15971](https://insights.sbomify.com/CVE-2026-15971/): CVE-2026-15971 (critical 9.8)
- [CVE-2026-15976](https://insights.sbomify.com/CVE-2026-15976/): CVE-2026-15976 (critical 9.8)
- [CVE-2026-7301](https://insights.sbomify.com/CVE-2026-7301/): CVE-2026-7301 (critical 9.8)
- [CVE-2026-7304](https://insights.sbomify.com/CVE-2026-7304/): CVE-2026-7304 (critical 9.8)
- [CVE-2026-5760](https://insights.sbomify.com/CVE-2026-5760/): CVE-2026-5760 (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-15969 and fix it if it is affected.

What it is: CVE-2026-15969 is a critical unsafe deserialization vulnerability in SGLang, published on 30 Jul 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-2026-15969 in the wild and no public exploit code.

Affected product: SGLang. 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-2026-15969/ (Markdown: https://insights.sbomify.com/CVE-2026-15969/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-15969
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-15969
- OSV: https://osv.dev/vulnerability/CVE-2026-15969

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-15969/
Summaries are generated and may contain mistakes; the official description above is the record.