stale SigV4 headers sent unintended
CVSS score
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EPSS probability
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Risk score
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Published
3 h ago
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Vulnerability description
DayBreach AI Explanation
Verified against sourcesSources read
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Source agreement
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Evidence confidence
%55
Short explanation
CVE-2026-86409 is a vulnerability in curl where setting CURLOPT_AWS_SIGV4 to NULL fails to disable SigV4 authentication contrary to expectations and documentation. A subsequent transfer on the same handle still transmits an Authorization: AWS4-HMAC-SHA256 header to the next target URL, leaking state information.
This vulnerability can cause sensitive authentication headers to be leaked to unexpected endpoints, leading to state information exposure. It introduces security risks for applications leveraging curl for network transfers.
What should be done?
- Follow vendor advisories
- Review the usage lifecycle of handle objects
Chain of evidence and sources
CURLOPT_AWS_SIGV4 seçeneğinin NULL yapılması SigV4 kimlik doğrulamasını devre dışı bırakmamaktadır.
Aynı handle üzerindeki sonraki transferler Authorization başlığını sonraki URL adresine göndermeye devam etmektedir.
Show the technical text from the sources
Setting `CURLOPT_AWS_SIGV4` to NULL but does not disable SigV4 authentication, contrary to expectations and documentation. A subsequent transfer on the same handle still sends an `Authorization: AWS4-HMAC-SHA256` header to whatever URL isset next, leaking state information.
This explanation was compiled automatically from the source records. Scores, active exploitation, patch and exploit status come straight from the sources.
IMPACT: Affected Products and Software
Affected Products
The following products are affected by CVE-2026-86409 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.
| ID | VENDOR | PRODUCT | ACTION |
|---|---|---|---|
| 1 | curl | curl | View |
RED HAT CSAF/VEX: Product Impact Check
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 |
|---|---|---|---|---|
| The sources have not yet published a verified CVSS metric. | ||||
Patch and Remediation Guide
Solution & Remediation Advisory
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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-2026-86409 is associated with the following CWEs:
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-2026-86409 weaknesses.
Official Sources and Advisories
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