# CVE-2019-9192: Denial of service in n/a

> A crafted regular expression in glibc can cause uncontrolled recursion, leading to a denial of service in applications using the library.

- **Severity:** High 7.5 (`CVSS:3.0/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:** 26 Feb 2019
- **Updated:** 4 Aug 2024
- **Also known as:** DEBIAN-CVE-2019-9192, GHSA-v5rq-2q5p-p82v, ROOT-OS-DEBIAN-12-CVE-2019-9192, ROOT-OS-DEBIAN-13-CVE-2019-9192

## What is CVE-2019-9192?

CVE-2019-9192 is a high-severity denial of service vulnerability in Gnu Glibc, published on 26 Feb 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

In the GNU C Library (aka glibc or libc6) through 2.29, check_dst_limits_calc_pos_1 in posix/regexec.c has Uncontrolled Recursion, as demonstrated by '(|)(\\1\\1)*' in grep, a different issue than CVE-2018-20796. NOTE: the software maintainer disputes that this is a vulnerability because the behavior occurs only with a crafted pattern

Weakness: CWE-674 (Uncontrolled Recursion)

## Which versions are affected by CVE-2019-9192?

It affects 1 product.


Products: Gnu Glibc.

## How do I fix CVE-2019-9192?

No fix published yet.

## Is CVE-2019-9192 being exploited?

There is no known exploitation of CVE-2019-9192 in the wild and no public exploit code.

## Other vulnerabilities in Gnu Glibc

- [CVE-2026-5450](https://insights.sbomify.com/CVE-2026-5450/): scanf %mc off-by-one heap buffer overflow (critical 9.8)
- [CVE-2023-25139](https://insights.sbomify.com/CVE-2023-25139/): Memory corruption in n/a (critical 9.8)
- [CVE-1999-0199](https://insights.sbomify.com/CVE-1999-0199/): Other in n/a (critical 9.8)
- [CVE-2019-1010022](https://insights.sbomify.com/CVE-2019-1010022/): Security feature bypass in glibc (critical 9.8)
- [CVE-2005-3590](https://insights.sbomify.com/CVE-2005-3590/): Memory corruption in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-9192 and fix it if it is affected.

What it is: CVE-2019-9192 is a high-severity denial of service vulnerability in Gnu Glibc, published on 26 Feb 2019. 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-2019-9192 in the wild and no public exploit code.

Affected product: Gnu Glibc. 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-2019-9192/ (Markdown: https://insights.sbomify.com/CVE-2019-9192/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-9192
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-9192
- OSV: https://osv.dev/vulnerability/CVE-2019-9192

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-9192/
Summaries are generated and may contain mistakes; the official description above is the record.