# CVE-2026-19271: Blind LDAP Injection in Sign-In Endpoint in TÜBİTAK BİLGEM's Liderahenk

> Attackers can perform blind LDAP injection on the sign-in endpoint to extract data or bypass authentication in Liderahenk.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 26 Aug 2026
- **Updated:** 26 Aug 2026
- **Also known as:** GHSA-24r5-pqg8-wx72

## What is CVE-2026-19271?

CVE-2026-19271 is a high-severity vulnerability in TÜBİTAK BİLGEM Software Technologies Research Institute Liderahenk, published on 26 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection') vulnerability in TÜBİTAK BİLGEM Software Technologies Research Institute Liderahenk allows LDAP Injection.

This issue affects Liderahenk: from 3.4.0 before 3.5.5.

Weakness: CWE-90 (Improper Neutralization of Special Elements used in an LDAP Query)

## Which versions are affected by CVE-2026-19271?


## How do I fix CVE-2026-19271?

No fix has been published for CVE-2026-19271 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-19271 being exploited?

There is no known exploitation of CVE-2026-19271 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-19271 and fix it if it is affected.

What it is: CVE-2026-19271 is a high-severity vulnerability in TÜBİTAK BİLGEM Software Technologies Research Institute Liderahenk, published on 26 Aug 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-2026-19271 in the wild and no public exploit code.

Affected product: TÜBİTAK BİLGEM Software Technologies Research Institute Liderahenk. 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-2026-19271/ (Markdown: https://insights.sbomify.com/CVE-2026-19271/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-19271
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-19271
- OSV: https://osv.dev/vulnerability/CVE-2026-19271

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-19271/
Summaries are generated and may contain mistakes; the official description above is the record.