# CVE-2026-85062: Colord: Slow rejection of oversized malformed color strings

> An attacker can cause a denial of service by supplying oversized malformed color strings to the colord library, blocking the processing thread.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 3 Sep 2026
- **Updated:** 9 Sep 2026
- **Also known as:** AZL-99084, CLSA-2026-1790006394, GHSA-2wm5-q62r-hmrv, MINI-7m49-wmhq-g9fj, MINI-q23j-879p-gpv7, MINI-qgm8-fjx9-946f

## What is CVE-2026-85062?

CVE-2026-85062 is a medium-severity denial of service vulnerability in omgovich colord, published on 3 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Colord is a tiny yet powerful tool for high-performance color manipulations and conversions. Prior to 2.9.4, synchronous CSS color string matchers in src/colorModels/rgbString.ts, src/colorModels/hslString.ts, src/colorModels/hwbString.ts, src/colorModels/lchString.ts, and src/colorModels/cmykString.ts use the ambiguous numeric regular expression ([+-]?\d*.?\d+), allowing the same digits to be divided between overlapping quantifiers in quadratically many ways when malformed input is rejected. An attacker who can supply an unbounded color string to colord(), getFormat(), isEqual(), mix(), or contrast(), including through a request body, JSON field, or uploaded stylesheet, can block the processing thread with a multi-kilobyte payload. The affected matchers are parseRgbaString, parseHslaString, parseHwbaString, parseLchaString, and parseCmykaString. This issue is fixed in version 2.9.4.

Weakness: CWE-1333 (Inefficient Regular Expression Complexity)

## Which versions are affected by CVE-2026-85062?

2 open source packages ship an affected version, including colord.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `colord` | npm | All versions | 2.9.4 |
| `colord` | npm | All versions | 2.9.4 |

## How do I fix CVE-2026-85062?

Upgrade colord to 2.9.4 or later.

## Is CVE-2026-85062 being exploited?

There is no known exploitation of CVE-2026-85062 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-85062 and fix it if it is affected.

What it is: CVE-2026-85062 is a medium-severity denial of service vulnerability in omgovich colord, published on 3 Sep 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-2026-85062 in the wild and no public exploit code.

Affected packages and fixed versions:
- colord (npm): affected all versions; fixed in 2.9.4
- colord (npm): affected all versions; fixed in 2.9.4

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-2026-85062/ (Markdown: https://insights.sbomify.com/CVE-2026-85062/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-85062
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-85062
- OSV: https://osv.dev/vulnerability/CVE-2026-85062

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-85062/
Summaries are generated and may contain mistakes; the official description above is the record.