CVE-2026-109965Proof of concept (PoC) published · CISA

Serena before 2.0.0 Symlink Following in File Tools Allows Access Outside Project Root

CVSS score

8.4

EPSS probability

—

Risk score

0.8

Published

21 h ago

Overview Public Exploits (0)Newsroom Vulnerability Timeline

Official patch verified

Etkilenen ürün ve sürüm için yayımlanan güvenlik güncellemesini uygulayın.

Impact on My Inventory

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Vulnerability description

CVE AI research

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DayBreach AI Explanation

Verified against sources

Serena CVE-2026-109965 Symlink Vulnerability

Sources read

Source agreement

0/2

Evidence confidence

%44

Short explanation

Serena before versions 2.0.0 contains an improper link resolution vulnerability because Project.is_path_in_project() normalizes paths lexically without resolving symlinks.

Why does it matter?

Attackers can exploit this vulnerability to access or overwrite sensitive files located outside the project directory.

What should be done?

Upgrade Serena to version 2.0.0 or later
Follow vendor advisories and patches
Audit repositories for symlink usage

Note on uncertainty

2 alanda kaynak uyuşmazlığı var. DayBreach bu değerleri saklamadı; kaynak karşılaştırması aşağıda gösteriliyor.

Chain of evidence and sources2 verified claims

Serena 2.0.0 öncesi sürümlerde uygunsuz bağlantı çözme zafiyeti mevcuttur.

S0 · daybreach-canonical S1 · cvelist S2 · nvd

Project.is_path_in_project() fonksiyonu sembolik bağları çözmeden yolları lexikal olarak normalleştirmektedir.

S0 · daybreach-canonical S1 · cvelist S2 · nvd

Show the technical text from the sources

Serena before 2.0.0 contains an improper link resolution vulnerability that allows attackers to access files outside the project root by committing symlinks inside a repository. Project.is_path_in_project() normalizes paths lexically without resolving symlinks, so file tools like read_file and create_text_file can read or overwrite files such as SSH keys or cloud credentials.

CVSS vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

CWE: CWE-59

Explanation produced with the local gemini-flash-lite-latest model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-109965 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

ID	VENDOR	PRODUCT	ACTION
1	oraios	serena	View

Total affected vendors: 1|Products: 1

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCORE	VERSION	SEVERITY	VECTOR	SOURCE
8.4	CVSS V4_0	HIGH	CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N	CVE CNA
8.4	CVSS V40	HIGH	CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X	NVD
7.1	CVSS V3_1	HIGH	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N	CVE CNA
7.1	CVSS V31	HIGH	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N	NVD

Patch and Remediation Guide

Solution & Remediation Advisory

Patch verified

2 doğrulanmış yama veya düzeltilmiş sürüm kanıtı bulundu.

cvelist

CNA çözüm referansı

Open source

reference

Yama veya çözüm referansı

Open source

Confirm the affected product and version against the source evidence above.

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Apply the official update named in the evidence only to the matching product and version.

Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-109965 is associated with the following CWEs:

CWE-59: Common Weakness Enumeration Entry CWE-59

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-109965 weaknesses.

CAPEC-66: SQL Injection CAPEC-126: Path Traversal CAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureYerel erişim

PermissionsGerekmiyor

User—

Official Sources and Advisories

https://github.com/oraios/serena/issues/2144vendor-advisory https://github.com/oraios/serena/commit/6f20f9b822d85bb063008e786f808d04619dd54epatch serena v2.0.0 Release Notesvendor-advisory https://github.com/oraios/serena/blob/v1.7.0/src/serena/project.pyvendor-advisory https://github.com/oraios/serenavendor-advisory VulnCheck Advisory: Serena before 2.0.0 Symlink Following in File Tools Allows Access Outside Project Rootvendor-advisory

CVSS Vector Radar Chart

8.4 / 10

Vulnerability Scoring Details

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredNone required

User InteractionP

Confidentiality (Gizlilik)Low

Integrity (Bütünlük)P

Availability (Erişilebilirlik)None

Yama doğrulandı

2 doğrulanmış yama veya düzeltilmiş sürüm kanıtı bulundu.

Follow the vendor

oraios

Weakness Type (CWE & CAPEC)

CWE-59

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