# CVE-2026-19748: Tenda CH7 Kylin Web Service CWebSessionManager_ParseSession entropy

> Insufficient entropy in session parsing allows remote attackers to potentially bypass authentication on Tenda routers.

- **Severity:** Medium 6.3 (`CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 13 Aug 2026
- **Updated:** 14 Aug 2026
- **Also known as:** GHSA-6ww3-pvc7-5crf

## What is CVE-2026-19748?

CVE-2026-19748 is a medium-severity vulnerability in Tenda CH10, published on 13 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A security vulnerability has been detected in Tenda CH7, CH7G, CH10, CP3, CP3 Pro, CP7, TC3B14C, TC3B15C, TC3T14C and TC3T15C up to 20260625. Affected is the function CWebSessionManager_ParseSession of the file /user/bin/Kylin of the component Kylin Web Service. Such manipulation of the argument SESSION leads to insufficient entropy. The attack may be performed from remote. Attacks of this nature are highly complex. The exploitability is told to be difficult.

Weakness: CWE-331 (Insufficient Entropy), CWE-330 (Use of Insufficiently Random Values)

## Which versions are affected by CVE-2026-19748?


## How do I fix CVE-2026-19748?

No fix has been published for CVE-2026-19748 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-19748 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-19748 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-19748 and fix it if it is affected.

What it is: CVE-2026-19748 is a medium-severity vulnerability in Tenda CH10, published on 13 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-19748 exists.

Affected product: Tenda CH10. 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-2026-19748/ (Markdown: https://insights.sbomify.com/CVE-2026-19748/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-19748
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-19748
- OSV: https://osv.dev/vulnerability/CVE-2026-19748

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-19748/
Summaries are generated and may contain mistakes; the official description above is the record.