CVE-2026-32600
Simplesamlphp Xml-Security ≤ 1.13.9
Raw vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:NSummary
CVE-2026-32600 is a high-severity Improper Validation of Integrity Check Value (CWE-354) vulnerability in Simplesamlphp Xml-Security. Its CVSS base score is 8.2 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Supply Chain Compromise (T1195); ranked at the 5th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
The strongest mitigations our analysis identified map to SC-13 (Cryptographic Protection) and SC-8 (Transmission Confidentiality and Integrity) — see the control section below for these in your framework.
Deeper analysis AI-assisted summary
Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.
CVE-2026-32600 affects the xml-security library, which implements XML signatures and encryption. In versions prior to 2.3.1 and 1.13.9, XML nodes encrypted using AES-128-GCM, AES-192-GCM, or AES-256-GCM fail to validate the authentication tag length, violating proper GCM handling as described in CWE-354 (Insufficient Entropy in Random Number Generator, tied to authentication tag issues). This flaw enables cryptographic weaknesses in XML encryption processing.
A remote, unauthenticated attacker with network access can exploit this vulnerability with low complexity and no user interaction, as indicated by its CVSS v3.1 base score of 8.2 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N). Successful exploitation allows brute-forcing the authentication tag to recover the GHASH key, decrypting affected XML nodes and exposing confidential data. Additionally, attackers can forge arbitrary ciphertexts without knowledge of the encryption key, potentially enabling integrity violations.
The xml-security GitHub security advisory (GHSA-r353-4845-pr5p) and related commits detail the fix, recommending an upgrade to version 2.3.1 or 1.13.9, where authentication tag length validation is properly enforced. Practitioners should review dependencies using this library, such as in SimpleSAMLphp integrations, and apply patches immediately to mitigate risks.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-12099
Vulnerability Data
xml-security is a library that implements XML signatures and encryption. Prior to versions 2.3.1 and 1.13.9, 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…
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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 2.3.1 and 1.13.9.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise Techniques
CVEs Like This One
Affected Assets
Mitigating Controls
Control response
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- 10 hardening rules · 4 OS baselines
V10.4.12
Mitigating Controls (NIST 800-53 r5) AI
Requires integrity verification tools that detect unauthorized changes when checksum validation is missing or flawed.
Mandates cryptographic mechanisms that include integrity protection, preventing improper checksum validation.
Requires protection of transmitted information integrity, directly mandating correct validation of integrity checks.
Mitigating Controls (NIST CSF 2.0) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.
Requires cryptographic hashes and signatures that directly enforce integrity-check validation for data at rest.
Requires cryptographic hashes and signatures that directly enforce integrity-check validation for data in transit.
Mandates pre-acquisition integrity assessment, addressing only the initial portion of the weakness lifecycle.
Requires verification of backup integrity, covering validation only within recovery scenarios.
Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.
Cryptographic controls mandate integrity mechanisms whose correct validation directly prevents CWE-354.
Secure coding standards require proper implementation and validation of checksums or MACs.
Security testing can detect missing integrity validation but does not itself implement the control.
Application security requirements include integrity checks on messages and data, mitigating improper validation.
Network security policies may require integrity protection on transit data, indirectly addressing the weakness.
Hardening callouts derived
Configuration rules from DISA STIG baselines that bear on weaknesses of the type cited by this CVE. Each rule is shown with the relationship its mapping actually records, against the CWE it was authored against. Derived via CVE→CWE over `controls_xwalks` (authoritative rows only; rows rated `none` are excluded).
Oracle Linux 8 (2 rules)
- V-248574 YUM must be configured to prevent the installation of patches, service packs, device drivers, or OL 8 system components that have not been digitally signed using a certificate that is recognized and approved by the organization. prevents CWE-354
- V-248575 OL 8 must prevent the installation of software, patches, service packs, device drivers, or operating system components of local packages without verification they have been digitally signed using a certificate that is issued by a Certificate Authority (CA) that is recognized and approved by the organization. prevents CWE-354
Oracle Linux 9 (1 rule)
- V-271523 OL 9 must check the GPG signature of locally installed software packages before installation. prevents CWE-354
RHEL 7 (2 rules)
- V-204447 The Red Hat Enterprise Linux operating system must prevent the installation of software, patches, service packs, device drivers, or operating system components from a repository without verification they have been digitally signed using a certificate that is issued by a Certificate Authority (CA) that is recognized and approved by the organization. prevents CWE-354
- V-204448 The Red Hat Enterprise Linux operating system must prevent the installation of software, patches, service packs, device drivers, or operating system components of local packages without verification they have been digitally signed using a certificate that is issued by a Certificate Authority (CA) that is recognized and approved by the organization. prevents CWE-354
RHEL 8 (2 rules)
- V-230264 RHEL 8 must prevent the installation of software, patches, service packs, device drivers, or operating system components from a repository without verification they have been digitally signed using a certificate that is issued by a Certificate Authority (CA) that is recognized and approved by the organization. prevents CWE-354
- V-230265 RHEL 8 must prevent the installation of software, patches, service packs, device drivers, or operating system components of local packages without verification they have been digitally signed using a certificate that is issued by a Certificate Authority (CA) that is recognized and approved by the organization. prevents CWE-354