CVE-2026-32313 json
xmlseclibs is Missing AES-GCM Authentication Tag Validation on Encrypted Nodes Allows for Unauthorized Decryption
published 2026-03-13 7 mo ago modified 2026-09-10 1 mo ago also EUVD-2026-12094 , GHSA-4v26-v6cg-g6f9
- cvss
- 8.2
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 6%
- public exploits
- 0
- none known
Summary
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 fixed in 3.1.5.
Patch / fix
- packagist robrichards/xmlseclibs 3.1.5
- xmlseclibs_project xmlseclibs 3.1.5
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 7 mo ago
Exploit prediction
0.17% chance of exploitation in the next 30 days, higher than 6% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/robrichards/xmlseclibs/security/advisories/GHSA-4v26-v6cg-g6f9 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N |
| GitHub | 3.1 | 8.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | robrichards/xmlseclibs | <3.1.5 |
3.1.5 |
Affected products
- robrichards xmlseclibs
Classification
- Weakness
-
- CWE-354 Improper Validation of Integrity Check Value
References
-
github.com
/robrichards/xmlseclibs/commit/03062be78178cbb5e8f605cd255dc32a14981f92
web, patch
-
github.com
/robrichards/xmlseclibs/security/advisories/GHSA-4v26-v6cg-g6f9
web, exploit, vendor-advisory
-
github.com
/robrichards/xmlseclibs/releases/tag/3.1.5
web, product
-
nvd.nist.gov
/vuln/detail/CVE-2026-32313
advisory
-
github.com
/robrichards/xmlseclibs
package
Sources
- CVE List CVE-2026-32313
- GitHub Advisory GHSA-4v26-v6cg-g6f9
- NVD CVE-2026-32313
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.