CVE-2016-7037: The verify function in Encryption/Symmetric.php in Malcolm Fell jwt before 1.0.3 does not use a timing-safe fu

Q: How do I fix CVE-2016-7037?

jwt: upgrade to newer than 1.0.2. Exact commands for each OS are on this page.

Q: Is CVE-2016-7037 being exploited?

CVE-2016-7037 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-2016-7037 affect?

CVE-2016-7037 affects jwt. Severity is high (CVSS 7.5). The verify function in Encryption/Symmetric.php in Malcolm Fell jwt before 1.0.3 does not use a timing-safe function for hash comparison, which allows attackers to spoof signatures via a timing attack.

Q: How urgent is CVE-2016-7037?

Priority 45/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADE

CVE-2016-7037 is a high-severity flaw (CVSS 7.5) affecting jwt. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The verify function in Encryption/Symmetric.php in Malcolm Fell jwt before 1.0.3 does not use a timing-safe function for hash comparison, which allows attackers to spoof signatures via a timing attack.

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	0.7% (top 46%)
CISA exploited list	No
Weakness	CWE-361
Published	2017-01-23
Last modified	2026-06-17

Publisher (CNA): Red Hat, Inc. · Vendor: emarref

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

Am I affected?

Timeline

2017-01-23 21:59 UTCPublished CVE record published
2026-06-17 00:52 UTCUpdated Record last modified

emarref jwt UPGRADE

Affected: <= 1.0.2

Fixed in: newer than 1.0.2

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 1.0.2 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade jwt

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-2016-7037?

jwt: upgrade to newer than 1.0.2. Exact commands for each OS are on this page.

Is CVE-2016-7037 being exploited?

CVE-2016-7037 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-2016-7037 affect?

CVE-2016-7037 affects jwt. Severity is high (CVSS 7.5). The verify function in Encryption/Symmetric.php in Malcolm Fell jwt before 1.0.3 does not use a timing-safe function for hash comparison, which allows attackers to spoof signatures via a timing attack.

How urgent is CVE-2016-7037?

Priority 45/100. High severity; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

Related CVEs

CVE-2025-45770 HIGH 7.0 UPGRADE jwt v5.4.3 was discovered to contain weak encryption
CVE-2021-41106 MEDIUM 4.4 UPGRADE JWT is a library to work with JSON Web Token and JSON Web Signature
CVE-2015-2951 MEDIUM 5.0 UPGRADE JWT.php in F21 JWT before 2.0 allows remote attackers to bypass signature verification via crafted tokens.

References

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