# CVE-2025-0725: gzip integer overflow

> An attacker can trigger a buffer overflow via integer overflow in libcurl's gzip decompression when using older zlib versions, potentially leading to code execution.

- **Severity:** High 7.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 5 Feb 2025
- **Updated:** 15 Oct 2026
- **Also known as:** ALPINE-CVE-2025-0725, AZL-56471, AZL-56498, AZL-56504, CLEANSTART-2026-CU26814, CURL-CVE-2025-0725, DEBIAN-CVE-2025-0725, ECHO-f69f-cbd4-841a, GHSA-vvqh-cqpj-5537, JLSEC-2026-422, MINI-xw4j-54fj-c8q9, ROOT-OS-ALPINE-315-CVE-2025-0725, ROOT-OS-DEBIAN-12-CVE-2025-0725

## What is CVE-2025-0725?

CVE-2025-0725 is a high-severity vulnerability in Haxx Curl, published on 5 Feb 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

When libcurl is asked to perform automatic gzip decompression of
content-encoded HTTP responses with the `CURLOPT_ACCEPT_ENCODING` option,
**using zlib 1.2.0.3 or older**, an attacker-controlled integer overflow would
make libcurl perform a buffer overflow.

Weakness: CWE-120 (Buffer Copy without Checking Size of Input)

## Which versions are affected by CVE-2025-0725?

It affects 8 products.


Products: Haxx Curl, Haxx Libcurl, Netapp Hci Baseboard Management Controller, Netapp Hci H610c Firmware, Netapp Hci H610s Firmware, Netapp Hci H615c Firmware, Netapp Solidfire \& Hci Management Node, Netapp Solidfire \& Hci Storage Node.

## How do I fix CVE-2025-0725?

Upgrade to a fixed version.

## Is CVE-2025-0725 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-0725 exists.

## Other vulnerabilities in Haxx Curl

- [CVE-2026-19931](https://insights.sbomify.com/CVE-2026-19931/): Negotiate ambient user conn reuse (critical 9.8)
- [CVE-2026-10536](https://insights.sbomify.com/CVE-2026-10536/): HTTP/2 stream-dependency tree UAF (critical 9.8)
- [CVE-2026-11856](https://insights.sbomify.com/CVE-2026-11856/): cross-origin Digest auth state leak (critical 9.8)
- [CVE-2026-8925](https://insights.sbomify.com/CVE-2026-8925/): SASL double-free (critical 9.8)
- [CVE-2026-9079](https://insights.sbomify.com/CVE-2026-9079/): stale proxy password leak (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-0725 and fix it if it is affected.

What it is: CVE-2025-0725 is a high-severity vulnerability in Haxx Curl, published on 5 Feb 2025. 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-2025-0725 exists.

Affected product: Haxx Curl. 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-2025-0725/ (Markdown: https://insights.sbomify.com/CVE-2025-0725/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-0725
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-0725
- OSV: https://osv.dev/vulnerability/CVE-2025-0725

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-0725/
Summaries are generated and may contain mistakes; the official description above is the record.