# CVE-2026-7263: DoS attack via DOMNode::C14N()

> Attackers can cause denial of service in PHP applications by triggering an infinite loop in DOMNode::C14N() via crafted XML data.

- **Severity:** Medium 6.3 (`CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/AU:Y/RE:M/U:Amber`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 10 May 2026
- **Updated:** 15 Jul 2026
- **Also known as:** BIT-libphp-2026-7263, BIT-php-2026-7263, BIT-php-min-2026-7263, DEBIAN-CVE-2026-7263, MINI-6gjw-744p-5m9w, MINI-wqw7-rmm7-r9h4, UBUNTU-CVE-2026-7263

## What is CVE-2026-7263?

CVE-2026-7263 is a medium-severity denial of service vulnerability in Php Php, published on 10 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

In PHP versions 8.4.* before 8.4.21 and 8.5.* before 8.5.6, DOMNode::C14N() method may process the XML data incorrectly, causing a circular linked list in the data structure representing the XML document. This may cause subsequent processing of the XML document to enter infinite loop, causing denial of service in the processing application.

Weakness: CWE-835 (Loop with Unreachable Exit Condition), CWE-404 (Improper Resource Shutdown or Release)

## Which versions are affected by CVE-2026-7263?

3 open source packages ship an affected version, including libphp, php and php-min. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `libphp` | Bitnami | From 8.4.0 | 8.4.21, 8.5.6 |
| `php` | Bitnami | From 8.4.0 | 8.4.21, 8.5.6 |
| `php-min` | Bitnami | From 8.4.0 | 8.4.21, 8.5.6 |

Products: Php Php.

## How do I fix CVE-2026-7263?

Upgrade libphp to a fixed version for your release line: 8.4.21 or 8.5.6.

## Is CVE-2026-7263 being exploited?

There is no known exploitation of CVE-2026-7263 in the wild and no public exploit code.

## Other vulnerabilities in Php Php

- [CVE-2012-2688](https://insights.sbomify.com/CVE-2012-2688/): Integer overflow in n/a (critical 10.0)
- [CVE-2012-2376](https://insights.sbomify.com/CVE-2012-2376/): Memory corruption in n/a (critical 10.0)
- [CVE-2011-3268](https://insights.sbomify.com/CVE-2011-3268/): Memory corruption in n/a (critical 10.0)
- [CVE-2009-4143](https://insights.sbomify.com/CVE-2009-4143/): Other in n/a (critical 10.0)
- [CVE-2008-5557](https://insights.sbomify.com/CVE-2008-5557/): Memory corruption in n/a (critical 10.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-7263 and fix it if it is affected.

What it is: CVE-2026-7263 is a medium-severity denial of service vulnerability in Php Php, published on 10 May 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-2026-7263 in the wild and no public exploit code.

Affected packages and fixed versions:
- libphp (Bitnami): affected from 8.4.0; fixed in 8.4.21, 8.5.6
- php (Bitnami): affected from 8.4.0; fixed in 8.4.21, 8.5.6
- php-min (Bitnami): affected from 8.4.0; fixed in 8.4.21, 8.5.6

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-2026-7263/ (Markdown: https://insights.sbomify.com/CVE-2026-7263/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-7263
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-7263
- OSV: https://osv.dev/vulnerability/CVE-2026-7263

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-7263/
Summaries are generated and may contain mistakes; the official description above is the record.