CVE-2026-58101: Crypt::OpenSSL::X509 versions before 2.1.3 for Perl allow denial of service via NULL pointer dereference. X50

Q: How do I fix CVE-2026-58101?

crypt\: upgrade to 2.1.3. Exact commands for each OS are on this page.

Q: Is CVE-2026-58101 being exploited?

CVE-2026-58101 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-58101 affect?

CVE-2026-58101 affects crypt\. Severity is high (CVSS 7.5). 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

Q: How urgent is CVE-2026-58101?

Priority 42/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

This month

HIGH 7.5REMOTEWATCHLISTUPGRADE

CVE-2026-58101 is a high-severity flaw (CVSS 7.5) affecting crypt\. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 u

Why this priority

High severity
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 77%)
CISA exploited list	No
Weakness	CWE-476
Published	2026-07-13
Last modified	2026-10-24

Publisher (CNA): CPANSec · Vendor: jonasbn

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-13 23:16 UTCPublished CVE record published
2026-10-24 22:10 UTCUpdated Record last modified

jonasbn crypt\ UPGRADE

Affected: < 2.1.3

Fixed in: 2.1.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy crypt || rpm -q crypt || crypt --version

2. UPGRADE to 2.1.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade crypt

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade crypt

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-58101?

crypt\: upgrade to 2.1.3. Exact commands for each OS are on this page.

Is CVE-2026-58101 being exploited?

CVE-2026-58101 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-58101 affect?

CVE-2026-58101 affects crypt\. Severity is high (CVSS 7.5). 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

How urgent is CVE-2026-58101?

Priority 42/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

Software pages

OpenSSL vulnerabilities · Perl vulnerabilities

Related CVEs

CVE-2026-58102 CRITICAL 9.1 UPGRADE Crypt::OpenSSL::X509 versions before 2.1.3 for Perl allow a heap out-of-bounds read via a long certificate ext

References

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