CVE-2026-32313Public exploitNetwork attack vector

Decryption and ciphertext forgery via truncated tags

Published Mar 13, 2026 · Updated Mar 13, 2026

Improper integrity validation in Rob Richards xmlseclibs before 3.1.5 allows remote attackers to decrypt or forge AES-GCM XML nodes. In XMLSecurityKey::decryptSymmetric, substr() accepts a truncated input as an authentication tag as short as one byte and passes it to openssl_decrypt without checking the required 16-byte length. A network-reachable application that decrypts attacker-controlled AES-GCM XML and exposes parsing differences provides an oracle for recovering the GHASH key, reading embedded secrets, and forging ciphertext.

CVSS severity8.2
High
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper integrity validation in Rob Richards xmlseclibs before 3.1.5 allows remote attackers to decrypt or forge AES-GCM XML nodes. In XMLSecurityKey::decryptSymmetric, substr() accepts a truncated input as an authentication tag as short as one byte and passes it to openssl_decrypt without checking the required 16-byte length. A network-reachable application that decrypts attacker-controlled AES-GCM XML and exposes parsing differences provides an oracle for recovering the GHASH key, reading embedded secrets, and forging ciphertext.

The record

CVE
CVE-2026-32313
Published
Mar 13, 2026
Updated
Mar 13, 2026
Vendor
Rob Richards
Product
xmlseclibs
Classifications
CWE-354, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 3.1.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Rob Richards · xmlseclibsversion=< 3.1.5

Published CVSS scores

8.2GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-354Improper Validation of Integrity Check Value
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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