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CVE-2026-13577— Dancer2 versions before 2.2.0 for Perl generate insecure session ids when required CSPRNG modules are unavailable

Quick assessment

Affected
CVE-2026-13577
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

PerlDancer Dancer2是PerlDancer组织的一个网络应用开发框架 PerlDancer Dancer2 2.1.0及之前版本存在加密问题漏洞，该漏洞源于CSPRNG modules不可用时Dancer2::Core::Role::SessionFactory::generate_id会退回到使用内置rand函数生成的session id，这些session id使用低熵且易猜测的源（如SHA-1哈希、内部计数器、进程ID等）生成，可预测的session id允许攻击者获得系统访问权限。

AI Predicted 5.3 Difficulty: Hard EPSS 0.57% · P45

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
None None < 2.2.0 affected

I. Basic Information for CVE-2026-13577

Vulnerability Information
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Vulnerability Title
Dancer2 versions before 2.2.0 for Perl generate insecure session ids when required CSPRNG modules are unavailable
Source: CVE Program / CVE List V5
Vulnerability Description
Dancer2 versions before 2.2.0 for Perl generate insecure session ids when required CSPRNG modules are unavailable. Dancer2::Core::Role::SessionFactory::generate_id silently falls back to a built-in rand-derived session id unless both Math::Random::ISAAC::XS and Crypt::URandom are available. The fallback session id is generated from a SHA-1 hash of a call to the built-in rand function, the absolute path of the Dancer2::Core::Role::SessionFactory module, an internal counter, the process id, the module instance memory address, and a shuffled string of characters (using the List::Util::shuffle function, which also uses the built-in rand function). These are all low-entropy and easily guessed sources. The built-in rand() function is seeded with 32-bits and considered unsuitable for security applications. Predictable session ids could allow an attacker to gain access to systems.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
可预测问题
Source: CVE Program / CVE List V5
Vulnerability Title
PerlDancer Dancer2 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
PerlDancer Dancer2是PerlDancer组织的一个网络应用开发框架 PerlDancer Dancer2 2.1.0及之前版本存在加密问题漏洞，该漏洞源于CSPRNG modules不可用时Dancer2::Core::Role::SessionFactory::generate_id会退回到使用内置rand函数生成的session id，这些session id使用低熵且易猜测的源（如SHA-1哈希、内部计数器、进程ID等）生成，可预测的session id允许攻击者获得系统访问权限。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
- - 0 ~ 2.2.0 -

II. Public POCs for CVE-2026-13577

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III. Intelligence Information for CVE-2026-13577

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Patches & Fixes for CVE-2026-13577 (1)

Vendor Advisories for CVE-2026-13577 (1)

Other References for CVE-2026-13577 (2)

IV. Related Vulnerabilities

Same weakness: CWE-340

V. Comments for CVE-2026-13577

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