Cyber Resilience

CVE-2026-16634

Published
24 July 2026
Modified
27 July 2026
CVSS Score v3.1 9.8
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.0077 52th percentile
Risk Priority 72 floored blend · peak EPSS

Summary

CVE-2026-16634 is a critical-severity Use of Unmaintained Third Party Components (CWE-1104) vulnerability. Its CVSS base score is 9.8 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Compromise Software Dependencies and Development Tools (T1195.001); ranked in the top 48% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to SA-22 (Unsupported System Components) — see the control section below for these in your framework.

OWASP Top 10 for Web (2025)

A03:2025 Software Supply Chain Failures

EU & UK References

Vulnerability Data

TOML::XS versions before 0.06 for Perl bundle an unsupported and vulnerable version of tomlc99. The tomlc99 library is no longer maintained, and has an uncontrolled recursion vulnerability publicly reported in the issue tracker. Any caller that passes untrusted TOML to…

more

from_toml risks a stack overflow from a deeply-nested document. TOML::XS version 0.06 or later uses the successor tomlc17 library.

CWE(s)
CWE-1104

Related Threats

MITRE ATT&CK Enterprise Techniques

T1195.001 Compromise Software Dependencies and Development Tools Initial Access
Adversaries may manipulate software dependencies and development tools prior to receipt by a final consumer for the purpose of data or system compromise.
attack.mitre.org →
T1195 Supply Chain Compromise Initial Access
Adversaries may manipulate products or product delivery mechanisms prior to receipt by a final consumer for the purpose of data or system compromise.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2025-34192Shared CWE-1104
CVE-2026-3031Shared CWE-1104
CVE-2025-20010Shared CWE-1104
CVE-2024-11999Shared CWE-1104
CVE-2026-60368Shared CWE-1104
CVE-2025-3497Shared CWE-1104
CVE-2026-41468Shared CWE-1104
CVE-2023-37524Shared CWE-1104
CVE-2025-55277Shared CWE-1104
CVE-2025-12104Shared CWE-1104

Affected Assets

—
XS
inferred from references and description; NVD did not file a CPE for this CVE

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)
  • 1 hardening rule · 1 OS baseline
Validate
Prove the fix (OWASP ASVS)
  • V15.1.2

Mitigating Controls (NIST 800-53 r5) AI

SA-22 Unsupported System Components good match

SA-22 directly requires replacing components once vendor support ends, structurally preventing reliance on unmaintained third-party code.

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.

GV.RM-04 partial match
prevents

GV.RM-04's high-level risk-response criteria can indirectly discourage unmaintained third-party use via policy, but alone removes none of the concrete supply-chain or maintenance decisions that produce CWE-1104.

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.

A.8.8 Management of technical vulnerabilities mostly match
finds

A maintained asset inventory plus scheduled scanning and patching directly reduces the window during which known vulnerable third-party components remain exploitable.

A.5.21 Managing information security in the ICT supply chain partial match
prevents

Periodic validation, certification demands, and life-cycle monitoring of supplier components help surface and replace unmaintained third-party elements before they become exploitable liabilities.

A.5.6 Contact with special interest groups none match
mitigates

Regular exposure to external advisories and vulnerability disclosures helps teams identify and replace unmaintained third-party components before attackers can exploit known weaknesses in them.

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 (1 rule)
  • V-248521 OL 8 must be a vendor-supported release. prevents CWE-1104

References