# CVE-2023-26117: angular vulnerable to regular expression denial of service via the $resource service

> Attackers can cause denial of service in Angular applications by sending crafted inputs that trigger catastrophic backtracking in the $resource service.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 30 Mar 2023
- **Updated:** 3 Nov 2025
- **Also known as:** CLSA-2026-1775781145, CLSA-2026-1775781146, CLSA-2026-1775781147, CLSA-2026-1775781148, DEBIAN-CVE-2023-26117, GHSA-2qqx-w9hr-q5gx, MINI-6f46-f56w-5g43, ROOT-APP-NPM-CVE-2023-26117, UBUNTU-CVE-2023-26117

## What is CVE-2023-26117?

CVE-2023-26117 is a medium-severity denial of service vulnerability in Fedoraproject Fedora, published on 30 Mar 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Versions of the package angular from 1.0.0 are vulnerable to Regular Expression Denial of Service (ReDoS) via the $resource service due to the usage of an insecure regular expression. Exploiting this vulnerability is possible by a large carefully-crafted input, which can result in catastrophic backtracking.

Weakness: CWE-1333 (Inefficient Regular Expression Complexity)

## Which versions are affected by CVE-2023-26117?

2 open source packages ship an affected version, including angular. It affects 2 products.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `angular` | npm | All versions to 1.8.3 | None |
| `angular` | npm | All versions to 1.8.3 | None |

Products: Angularjs Angularjs, Fedoraproject Fedora.

## How do I fix CVE-2023-26117?

Upgrade to a fixed version.

## Is CVE-2023-26117 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-26117 exists.

## Other vulnerabilities in Fedoraproject Fedora

- [CVE-2019-10768](https://insights.sbomify.com/CVE-2019-10768/): angular Prototype Pollution vulnerability (high 7.5)
- [CVE-2019-14863](https://insights.sbomify.com/CVE-2019-14863/): AngularJS Cross-site Scripting due to failure to sanitize `xlink.href` attributes (high 7.1)
- [CVE-2020-7676](https://insights.sbomify.com/CVE-2020-7676/): Angular vulnerable to Cross-site Scripting (medium 5.4)
- [CVE-2023-26116](https://insights.sbomify.com/CVE-2023-26116/): angular vulnerable to regular expression denial of service via the angular.copy() utility (medium 5.3)
- [CVE-2023-26118](https://insights.sbomify.com/CVE-2023-26118/): angular vulnerable to regular expression denial of service via the <input type="url"> element (medium 5.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-26117 and fix it if it is affected.

What it is: CVE-2023-26117 is a medium-severity denial of service vulnerability in Fedoraproject Fedora, published on 30 Mar 2023. 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-2023-26117 exists.

Affected packages and fixed versions:
- angular (npm): affected all versions up to 1.8.3; no fix listed
- angular (npm): affected all versions up to 1.8.3; no fix listed

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-2023-26117/ (Markdown: https://insights.sbomify.com/CVE-2023-26117/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-26117
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-26117
- OSV: https://osv.dev/vulnerability/CVE-2023-26117

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-26117/
Summaries are generated and may contain mistakes; the official description above is the record.