# CVE-2019-5436: Memory corruption in curl

> A heap buffer overflow in libcurl's TFTP code allows attackers to execute arbitrary code or cause denial of service.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 28 May 2019
- **Updated:** 14 Oct 2026
- **Also known as:** ALPINE-CVE-2019-5436, CLEANSTART-2026-IT13026, CURL-CVE-2019-5436, DEBIAN-CVE-2019-5436, DLA-1804-1, GHSA-8xvc-p9x4-w7jm, RHSA-2020:1020, RHSA-2020:2505, SUSE-SU-2019:1357-1, SUSE-SU-2019:1357-2, SUSE-SU-2019:1363-1, SUSE-SU-2019:14064-1, SUSE-SU-2019:2009-1, UBUNTU-CVE-2019-5436, USN-3993-1, USN-3993-2, openSUSE-SU-2019:1508-1

## What is CVE-2019-5436?

CVE-2019-5436 is a high-severity memory corruption vulnerability in Debian Debian Linux, published on 28 May 2019. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A heap buffer overflow in the TFTP receiving code allows for DoS or arbitrary code execution in libcurl versions 7.19.4 through 7.64.1.

Weakness: CWE-787 (Out-of-bounds Write), CWE-122 (Heap-based Buffer Overflow)

## Which versions are affected by CVE-2019-5436?

It affects 11 products.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `curl` | Red Hat:enterprise_linux:7::client | All versions | 0:7.29.0-57.el7 |
| `curl-debuginfo` | Red Hat:enterprise_linux:7::client | All versions | 0:7.29.0-57.el7 |
| `libcurl` | Red Hat:enterprise_linux:7::client | All versions | 0:7.29.0-57.el7 |
| `libcurl-devel` | Red Hat:enterprise_linux:7::client | All versions | 0:7.29.0-57.el7 |
| `curl` | Red Hat:enterprise_linux:7::computenode | All versions | 0:7.29.0-57.el7 |
| `curl-debuginfo` | Red Hat:enterprise_linux:7::computenode | All versions | 0:7.29.0-57.el7 |
| `libcurl` | Red Hat:enterprise_linux:7::computenode | All versions | 0:7.29.0-57.el7 |
| `libcurl-devel` | Red Hat:enterprise_linux:7::computenode | All versions | 0:7.29.0-57.el7 |
| `curl` | Red Hat:enterprise_linux:7::server | All versions | 0:7.29.0-57.el7 |
| `curl-debuginfo` | Red Hat:enterprise_linux:7::server | All versions | 0:7.29.0-57.el7 |
| `libcurl` | Red Hat:enterprise_linux:7::server | All versions | 0:7.29.0-57.el7 |
| `libcurl-devel` | Red Hat:enterprise_linux:7::server | All versions | 0:7.29.0-57.el7 |
| `curl` | Red Hat:enterprise_linux:7::workstation | All versions | 0:7.29.0-57.el7 |
| `curl-debuginfo` | Red Hat:enterprise_linux:7::workstation | All versions | 0:7.29.0-57.el7 |
| `libcurl` | Red Hat:enterprise_linux:7::workstation | All versions | 0:7.29.0-57.el7 |
| `libcurl-devel` | Red Hat:enterprise_linux:7::workstation | All versions | 0:7.29.0-57.el7 |
| `curl` | Red Hat:rhel_eus:7.7::computenode | All versions | 0:7.29.0-54.el7_7.3 |
| `curl-debuginfo` | Red Hat:rhel_eus:7.7::computenode | All versions | 0:7.29.0-54.el7_7.3 |
| `libcurl` | Red Hat:rhel_eus:7.7::computenode | All versions | 0:7.29.0-54.el7_7.3 |
| `libcurl-devel` | Red Hat:rhel_eus:7.7::computenode | All versions | 0:7.29.0-54.el7_7.3 |
| `curl` | Red Hat:rhel_eus:7.7::server | All versions | 0:7.29.0-54.el7_7.3 |
| `curl-debuginfo` | Red Hat:rhel_eus:7.7::server | All versions | 0:7.29.0-54.el7_7.3 |
| `libcurl` | Red Hat:rhel_eus:7.7::server | All versions | 0:7.29.0-54.el7_7.3 |
| `libcurl-devel` | Red Hat:rhel_eus:7.7::server | All versions | 0:7.29.0-54.el7_7.3 |
| `curl` | SUSE:Enterprise Storage 4 | All versions | 7.37.0-37.40.1 |
| `curl` | SUSE:Linux Enterprise Desktop 12 SP3 | All versions | 7.37.0-37.40.1 |
| `curl` | SUSE:Linux Enterprise Desktop 12 SP4 | All versions | 7.60.0-4.6.1 |
| `curl` | SUSE:Linux Enterprise Module for Basesystem 15 | All versions | 7.60.0-3.20.1 |
| `curl` | SUSE:Linux Enterprise Module for Basesystem 15 SP1 | All versions | 7.60.0-3.20.1 |
| `curl` | SUSE:Linux Enterprise Point of Sale 11 SP3 | All versions | 7.37.0-70.41.2 |
| `curl` | SUSE:Linux Enterprise Server 11 SP4-LTSS | All versions | 7.37.0-70.41.2 |
| `curl-openssl1` | SUSE:Linux Enterprise Server 11-SECURITY | All versions | 7.37.0-70.41.2 |
| `curl` | SUSE:Linux Enterprise Server 12 SP1-LTSS | All versions | 7.37.0-37.40.1 |
| `curl` | SUSE:Linux Enterprise Server 12 SP2-BCL | All versions | 7.37.0-37.40.1 |
| `curl` | SUSE:Linux Enterprise Server 12 SP2-LTSS | All versions | 7.37.0-37.40.1 |
| `curl` | SUSE:Linux Enterprise Server 12 SP3 | All versions | 7.37.0-37.40.1 |
| `curl` | SUSE:Linux Enterprise Server 12 SP4 | All versions | 7.60.0-4.6.1 |
| `curl` | SUSE:Linux Enterprise Server 12-LTSS | All versions | 7.37.0-37.40.1 |
| `curl` | SUSE:Linux Enterprise Server for SAP Applications 12 SP1 | All versions | 7.37.0-37.40.1 |
| `curl` | SUSE:Linux Enterprise Server for SAP Applications 12 SP2 | All versions | 7.37.0-37.40.1 |

Products: Debian Debian Linux, F5 Traffix Signaling Delivery Controller, Fedoraproject Fedora, Haxx Libcurl, Netapp Hci Management Node, Netapp Solidfire, Netapp Steelstore Cloud Integrated Storage, Opensuse Leap, Oracle Enterprise Manager Ops Center, Oracle Mysql Server, Oracle Oss Support Tools.

## How do I fix CVE-2019-5436?

Upgrade to a fixed version.

## Is CVE-2019-5436 being exploited?

There is no known exploitation of CVE-2019-5436 in the wild and no public exploit code.

## Other vulnerabilities in Debian Debian Linux

- [CVE-2015-3306](https://insights.sbomify.com/CVE-2015-3306/): ProFTPD Improper Access Control (critical 10.0, exploited in the wild)
- [CVE-2025-49113](https://insights.sbomify.com/CVE-2025-49113/): RoundCube Webmail Deserialization of Untrusted Data (critical 9.9, exploited in the wild)
- [CVE-2026-24061](https://insights.sbomify.com/CVE-2026-24061/): GNU InetUtils Argument Injection (critical 9.8, exploited in the wild)
- [CVE-2025-39682](https://insights.sbomify.com/CVE-2025-39682/): Linux Kernel Improper Check for Unusual or Exceptional Conditions (critical 9.8, exploited in the wild)
- [CVE-2024-9680](https://insights.sbomify.com/CVE-2024-9680/): Mozilla Firefox Use-After-Free (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-5436 and fix it if it is affected.

What it is: CVE-2019-5436 is a high-severity memory corruption vulnerability in Debian Debian Linux, published on 28 May 2019. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2019-5436 in the wild and no public exploit code.

Affected product: Debian Debian Linux. 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-2019-5436/ (Markdown: https://insights.sbomify.com/CVE-2019-5436/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-5436
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-5436
- OSV: https://osv.dev/vulnerability/CVE-2019-5436

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-5436/
Summaries are generated and may contain mistakes; the official description above is the record.