Source disclosure in WebDyne for Perl via default index page
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA.
Summary
WebDyne versions from 2.022 before 3.022 for Perl disclose application source to unauthenticated clients. The built-in index page is enabled by default in wrapper scripts such as webdyne.psgi, and its source viewer returns files under the document root named in the source parameter, including .psp, .pm and .pl files. A remote attacker can read the application's Perl code, including __PERL__ blocks of .psp pages and any credentials they hold.
Written with Claude Haiku 5.5 from the sources below · 2026-11-06
Description from the CNA
WebDyne versions from 2.022 before 3.022 for Perl disclose application source to unauthenticated clients via the viewer in the default index page. WebDyne's wrapper scripts, such as webdyne.psgi, enable the built-in index page by default. Its source viewer returns files under the document root named in the source parameter of an HTMX request, including .psp, .pm and .pl files. A remote attacker can read the application's Perl code, including the __PERL__ blocks of .psp pages and any credentials they hold.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | WebDyne | 2.022 to before 3.022 | 3.022 | Patch available | CNA |
- WebDyne Vendor— Affected 2.022 to before 3.022 Fixed in 3.022 Patch available CNA
Remediation
Update WebDyne for Perl to version 3.022, the fixed version.
Written with Claude Haiku 5.5 from the sources below · 2026-11-06
- Fix · CNA WebDyne Fixed in 3.022
Timeline
- 2026-10-31 Threatist record created from CVE-2026-78192
- 2026-10-31 Alias added: GHSA-hf35-9v4j-23x2
- 2026-11-06 CVSS score added · CISA ADP
- 2026-11-06 CISA SSVC decision points changed
References
Sources
- CVE-2026-78192 · CVE Program
- CVE-2026-78192 · NVD
- FIRST EPSS
- GHSA-hf35-9v4j-23x2 · GitHub Advisory Database · CC BY 4.0
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