CVE-2019-1010263: Perl Crypt::JWT prior to 0.023 is affected by: Incorrect Access Control

Q: How do I fix CVE-2019-1010263?

\: upgrade to 0.023. Exact commands for each OS are on this page.

Q: Is CVE-2019-1010263 being exploited?

CVE-2019-1010263 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-2019-1010263 affect?

CVE-2019-1010263 affects \. Severity is critical (CVSS 9.8). Perl Crypt::JWT prior to 0.023 is affected by: Incorrect Access Control. The impact is: allow attackers to bypass authentication by providing a token by crafting with hmac(). The component is: JWT.pm, line 614. The attack vector is: network

Q: How urgent is CVE-2019-1010263?

Priority 62/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2019-1010263 is a critical-severity flaw (CVSS 9.8) affecting \. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Perl Crypt::JWT prior to 0.023 is affected by: Incorrect Access Control. The impact is: allow attackers to bypass authentication by providing a token by crafting with hmac(). The component is: JWT.pm, line 614. The attack vector is: network connectivity. The fixed version is: after commit b98a59b42ded9f9e51b2560410106207c2152d6c.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.3% (top 29%)
CISA exploited list	No
Weakness	CWE-347
Published	2019-07-17
Last modified	2026-06-17

Publisher (CNA): DWF · Vendor: perl crypt\

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2019-07-17 21:15 UTCPublished CVE record published
2026-06-17 02:09 UTCUpdated Record last modified

perl crypt\ \ UPGRADE

Affected: < 0.023

Fixed in: 0.023

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 0.023 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade

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-2019-1010263?

\: upgrade to 0.023. Exact commands for each OS are on this page.

Is CVE-2019-1010263 being exploited?

CVE-2019-1010263 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-2019-1010263 affect?

CVE-2019-1010263 affects \. Severity is critical (CVSS 9.8). Perl Crypt::JWT prior to 0.023 is affected by: Incorrect Access Control. The impact is: allow attackers to bypass authentication by providing a token by crafting with hmac(). The component is: JWT.pm, line 614. The attack vector is: network

How urgent is CVE-2019-1010263?

Priority 62/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

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References

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