CVE-2026-32313: xmlseclibs is a library written in PHP for working with XML Encryption and Signatures

Q: How do I fix CVE-2026-32313?

xmlseclibs: upgrade to 3.1.5. Exact commands for each OS are on this page.

Q: Is CVE-2026-32313 being exploited?

CVE-2026-32313 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-2026-32313 affect?

CVE-2026-32313 affects xmlseclibs. Severity is high (CVSS 8.2). xmlseclibs is a library written in PHP for working with XML Encryption and Signatures. Prior to 3.1.5, XML nodes encrypted with either aes-128-gcm, aes-192-gcm, or aes-256-gcm lack validation of the authentication tag length. An attacker ca

Q: How urgent is CVE-2026-32313?

Priority 40/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 8.2REMOTEUPGRADE

CVE-2026-32313 is a high-severity flaw (CVSS 8.2) affecting xmlseclibs. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

xmlseclibs is a library written in PHP for working with XML Encryption and Signatures. Prior to 3.1.5, XML nodes encrypted with either aes-128-gcm, aes-192-gcm, or aes-256-gcm lack validation of the authentication tag length. An attacker can use this to brute-force an authentication tag, recover the GHASH key, and decrypt the encrypted nodes. It also allows to forge arbitrary ciphertexts without knowing the encryption key. This vulnerability is f

Why this priority

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

A fixed release or distro patch exists.

Risk facts

CVSS score	8.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 95%)
CISA exploited list	No
Weakness	CWE-354
Published	2026-03-16
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: xmlseclibs project

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

Am I affected?

Timeline

2026-03-16 14:19 UTCPublished CVE record published
2026-06-17 10:35 UTCUpdated Record last modified

xmlseclibs project xmlseclibs UPGRADE

Affected: < 3.1.5

Fixed in: 3.1.5

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 3.1.5 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade xmlseclibs

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-2026-32313?

xmlseclibs: upgrade to 3.1.5. Exact commands for each OS are on this page.

Is CVE-2026-32313 being exploited?

CVE-2026-32313 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-2026-32313 affect?

CVE-2026-32313 affects xmlseclibs. Severity is high (CVSS 8.2). xmlseclibs is a library written in PHP for working with XML Encryption and Signatures. Prior to 3.1.5, XML nodes encrypted with either aes-128-gcm, aes-192-gcm, or aes-256-gcm lack validation of the authentication tag length. An attacker ca

How urgent is CVE-2026-32313?

Priority 40/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

Related CVEs

CVE-2025-66578 MEDIUM 6.0 UPGRADE xmlseclibs is a library written in PHP for working with XML Encryption and Signatures

References

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