# CVE-2026-58101: Crypt::OpenSSL::X509 versions before 2.1.3 for Perl allow denial of service via NULL pointer dereference

> An attacker can crash the Perl process by providing a malformed certificate to the Crypt::OpenSSL::X509 library, causing a denial of service.

- **Severity:** High 7.5 (`CVSS:3.1/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:** 13 Jul 2026
- **Updated:** 14 Jul 2026
- **Also known as:** DEBIAN-CVE-2026-58101, GHSA-8wqq-45fp-2xmp, UBUNTU-CVE-2026-58101

## What is CVE-2026-58101?

CVE-2026-58101 is a high-severity vulnerability in JONASBN Crypt::OpenSSL::X509, published on 13 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Crypt::OpenSSL::X509 versions before 2.1.3 for Perl allow denial of service via NULL pointer dereference.

X509V3_EXT_d2i(ext) returns NULL when an extension's DER value fails to parse. basicC, ia5string, and auth_att dereference its result without a NULL check. keyid_data also dereferences akid->keyid, which is NULL for an empty AKI SEQUENCE (DER 30 00) even when the parse succeeds.

A caller invoking an affected helper on an extension from an untrusted certificate triggers a SIGSEGV that crashes the Perl process.

Weakness: CWE-476 (NULL Pointer Dereference)

## Which versions are affected by CVE-2026-58101?

It affects 1 product.


Products: Jonasbn Crypt\.

## How do I fix CVE-2026-58101?

Upgrade to a fixed version.

## Is CVE-2026-58101 being exploited?

There is no known exploitation of CVE-2026-58101 in the wild and no public exploit code.

## Other vulnerabilities in JONASBN Crypt::OpenSSL::X509

- [CVE-2026-58102](https://insights.sbomify.com/CVE-2026-58102/): Memory corruption in Crypt::OpenSSL::X509 (critical 9.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-58101 and fix it if it is affected.

What it is: CVE-2026-58101 is a high-severity vulnerability in JONASBN Crypt::OpenSSL::X509, published on 13 Jul 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-2026-58101 in the wild and no public exploit code.

Affected product: JONASBN Crypt::OpenSSL::X509. 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-2026-58101/ (Markdown: https://insights.sbomify.com/CVE-2026-58101/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-58101
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-58101
- OSV: https://osv.dev/vulnerability/CVE-2026-58101

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-58101/
Summaries are generated and may contain mistakes; the official description above is the record.