CVE-2022-31157: LTI 1.3 Tool Library is a library used for building IMS-certified LTI 1.3 tool providers in PHP

Q: How do I fix CVE-2022-31157?

lti 1.3 tool library: upgrade to 5.0.0. Exact commands for each OS are on this page.

Q: Is CVE-2022-31157 being exploited?

CVE-2022-31157 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-2022-31157 affect?

CVE-2022-31157 affects lti 1.3 tool library. Severity is high (CVSS 7.5). LTI 1.3 Tool Library is a library used for building IMS-certified LTI 1.3 tool providers in PHP. Prior to version 5.0, the function used to generate random nonces was not sufficiently cryptographically complex. Users should upgrade to versi

Q: How urgent is CVE-2022-31157?

Priority 41/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADE

CVE-2022-31157 is a high-severity flaw (CVSS 7.5) affecting lti 1.3 tool library. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

LTI 1.3 Tool Library is a library used for building IMS-certified LTI 1.3 tool providers in PHP. Prior to version 5.0, the function used to generate random nonces was not sufficiently cryptographically complex. Users should upgrade to version 5.0 to receive a patch. There are currently no known workarounds.

Why this priority

High severity
Remotely exploitable, no login, no user action

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	0.5% (top 61%)
CISA exploited list	No
Weakness	CWE-327, CWE-330
Published	2022-07-15
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: packback

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

Am I affected?

Timeline

2022-07-15 18:15 UTCPublished CVE record published
2026-06-17 04:44 UTCUpdated Record last modified

packback lti 1.3 tool library UPGRADE

Affected: < 5.0.0

Fixed in: 5.0.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy lti-1.3-tool-library || rpm -q lti-1.3-tool-library || lti-1.3-tool-library --version

2. UPGRADE to 5.0.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade lti-1.3-tool-library

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade lti-1.3-tool-library

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-2022-31157?

lti 1.3 tool library: upgrade to 5.0.0. Exact commands for each OS are on this page.

Is CVE-2022-31157 being exploited?

CVE-2022-31157 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-2022-31157 affect?

CVE-2022-31157 affects lti 1.3 tool library. Severity is high (CVSS 7.5). LTI 1.3 Tool Library is a library used for building IMS-certified LTI 1.3 tool providers in PHP. Prior to version 5.0, the function used to generate random nonces was not sufficiently cryptographically complex. Users should upgrade to versi

How urgent is CVE-2022-31157?

Priority 41/100. High severity; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

Related CVEs

CVE-2022-31158 HIGH 7.5 UPGRADE LTI 1.3 Tool Library is a library used for building IMS-certified LTI 1.3 tool providers in PHP

References

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