Server-side request forgery in Google::Auth for Perl AWS credentials
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA.
Summary
Google::Auth for Perl version 0.12 does not validate the URLs in the credential_source settings of AWS external account credentials. This missing host check enables server-side request forgery (CWE-918), so the code sends requests to hosts named in the configuration. A caller that builds credentials from a configuration it does not fully control sends GET and PUT requests to internal services and link-local metadata endpoints.
Written with Claude Haiku 5.5 from the sources below · 2026-11-06
Description from the CNA
Google::Auth versions 0.12 for Perl allow server side request forgery via unvalidated credential_source URLs in AWS external account credentials. An external_account configuration with the AWS subject token type selects Google::Auth::ExternalAccountCredentials::Aws. Its retrieve_subject_token sends requests to the imdsv2_session_token_url, url and region_url fields of credential_source without the host check that the other credential classes apply. Any caller that builds credentials from a configuration it does not fully control issues GET and PUT requests to hosts the configuration names, including internal services and link-local metadata endpoints.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Total
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 |
|---|---|---|---|---|---|
| — | Google-Auth | 0.12 | — | No fix listed | CNA |
- Google-Auth Vendor— Affected 0.12 Fixed in — No fix listed CNA
Remediation
The sources list no fixed version for Google-Auth.
Written with Claude Haiku 5.5 from the sources below · 2026-11-06
Timeline
- 2026-11-01 Threatist record created from CVE-2026-74759
- 2026-11-01 Alias added: GHSA-p2f2-c96p-7p43
- 2026-11-06 CVSS score added · CISA ADP
- 2026-11-06 CISA SSVC decision points changed
- 2026-11-06 Priority changed: LOW → MEDIUM
References
Sources
- CVE-2026-74759 · CVE Program
- CVE-2026-74759 · NVD
- FIRST EPSS
- GHSA-p2f2-c96p-7p43 · GitHub Advisory Database · CC BY 4.0
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