CVE-2026-5140
Raw vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HSummary
CVE-2026-5140 is a high-severity CRLF Injection (CWE-93) vulnerability in Gov (inferred from references). Its CVSS base score is 8.8 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Content Injection (T1659); ranked at the 39th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified map to SI-10 (Information Input Validation) — 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-2026-5140 is an improper neutralization of CRLF sequences, known as a CRLF injection vulnerability, in Pardus software developed by TUBITAK BILGEM Software Technologies Research Institute. This flaw enables authentication bypass and affects Pardus versions from <=0.6.4 before 0.8.0. The vulnerability is classified under CWE-93 and carries a CVSS v3.1 base score of 8.8 (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H), indicating high severity due to its potential for significant confidentiality, integrity, and availability impacts.
A remote, unauthenticated attacker can exploit this vulnerability over the network with low complexity, though it requires user interaction to succeed. By injecting CRLF sequences, the attacker can bypass authentication mechanisms, potentially gaining unauthorized access to the affected system. Successful exploitation could lead to high-impact outcomes, including data exposure, modification of system resources, and disruption of services.
The advisory from USOM (https://www.usom.gov.tr/bildirim/tr-26-0131) provides details on this vulnerability, including recommended mitigations such as upgrading to Pardus version 0.8.0 or later. Security practitioners should consult this reference for patch information and additional guidance.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-26228
Vulnerability Data
Improper neutralization of CRLF sequences ('CRLF injection') vulnerability in TUBITAK BILGEM Software Technologies Research Institute Pardus Update allows Authentication Bypass. This issue affects Pardus Update: from 0.6.3 before 0.6.4.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise Techniques
CVEs Like This One
Affected Assets
Mitigating Controls
Control response
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V4.2.4
Mitigating Controls (NIST 800-53 r5) AI
Input validation directly stops untrusted data containing CRLF sequences from reaching the component that treats CRLF as a delimiter.
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.
Secure SDLC practices directly require input neutralization and validation to block CRLF injection.
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.
Security testing can detect CRLF flaws but does not itself implement the neutralization.
Secure development lifecycle mandates input validation and output encoding that directly prevents CRLF injection.
Application security requirements include rules for neutralizing special characters such as CRLF in inputs.
Secure architecture principles encourage safe handling of untrusted data but do not prescribe specific CRLF controls.
Secure coding standards explicitly require neutralization of CRLF sequences, fully addressing this weakness.