# CVE-2022-27781: Denial of service in https://github.com/curl/curl

> A malicious server can cause libcurl built with NSS to enter an infinite loop when retrieving certificate information, leading to denial of service.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 1 Jun 2022
- **Updated:** 14 Oct 2026
- **Also known as:** ALPINE-CVE-2022-27781, AZL-9890, CLEANSTART-2026-OZ32877, CLSA-2022-1656430897, CURL-CVE-2022-27781, DEBIAN-CVE-2022-27781, ECHO-1b54-04db-3c05, GHSA-xgr5-38f7-xqvv, JLSEC-2026-390, UBUNTU-CVE-2022-27781

## What is CVE-2022-27781?

CVE-2022-27781 is a high-severity denial of service vulnerability in Debian Debian Linux, published on 1 Jun 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

libcurl provides the `CURLOPT_CERTINFO` option to allow applications torequest details to be returned about a server's certificate chain.Due to an erroneous function, a malicious server could make libcurl built withNSS get stuck in a never-ending busy-loop when trying to retrieve thatinformation.

Weakness: CWE-835 (Loop with Unreachable Exit Condition), CWE-400 (Uncontrolled Resource Consumption)

## Which versions are affected by CVE-2022-27781?

It affects 12 products.


Products: Debian Debian Linux, Haxx Curl, Netapp Clustered Data Ontap, Netapp H300s Firmware, Netapp H410s Firmware, Netapp H500s Firmware, Netapp H700s Firmware, Netapp Hci Bootstrap Os, Netapp Hci Compute Node, Netapp Solidfire\, Enterprise Sds \& Hci Storage Node, Netapp Solidfire \& Hci Management Node, Splunk Universal Forwarder.

## How do I fix CVE-2022-27781?

Upgrade to a fixed version.

## Is CVE-2022-27781 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2022-27781 exists.

## 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-2022-27781 and fix it if it is affected.

What it is: CVE-2022-27781 is a high-severity denial of service vulnerability in Debian Debian Linux, published on 1 Jun 2022. 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-2022-27781 exists.

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-2022-27781/ (Markdown: https://insights.sbomify.com/CVE-2022-27781/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-27781
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-27781
- OSV: https://osv.dev/vulnerability/CVE-2022-27781

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-27781/
Summaries are generated and may contain mistakes; the official description above is the record.