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CVE-2026-86409
stale SigV4 headers sent unintended
High8.1EPSS 1.1%
- Published
- Updated
- Reserved
- Assigned by
- curl
Description
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| CISA-ADPADP (enrichment) | 3.1 | High8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Awaiting Analysis | 3.1 | High8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 1.1% · top 34% of all CVEs (5 Nov 2026)
- CISA SSVC
- Exploitation: poc · Automatable: no · Technical impact: total
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.1.
Weakness
- CWE-201 Information Exposure Through Sent Data
- CWE-201 Insertion of Sensitive Information Into Sent Data (opens in a new tab)All about CWE-201 and its CVEs
Affected products
- affected 8.21.0 – ≤ 8.21.0
- affected 8.20.0 – ≤ 8.20.0
- affected 8.19.0 – ≤ 8.19.0
- affected 8.18.0 – ≤ 8.18.0
- affected 8.17.0 – ≤ 8.17.0
- affected 8.16.0 – ≤ 8.16.0
- affected 8.15.0 – ≤ 8.15.0
- affected 8.14.1 – ≤ 8.14.1
- affected 8.14.0 – ≤ 8.14.0
- affected 8.13.0 – ≤ 8.13.0
- affected 8.12.1 – ≤ 8.12.1
- affected 8.12.0 – ≤ 8.12.0
- affected 8.11.1 – ≤ 8.11.1
- affected 8.11.0 – ≤ 8.11.0
- affected 8.10.1 – ≤ 8.10.1
- affected 8.10.0 – ≤ 8.10.0
- affected 8.9.1 – ≤ 8.9.1
- affected 8.9.0 – ≤ 8.9.0
- affected 8.8.0 – ≤ 8.8.0
- affected 8.7.1 – ≤ 8.7.1
- affected 8.7.0 – ≤ 8.7.0
- affected 8.6.0 – ≤ 8.6.0
- affected 8.5.0 – ≤ 8.5.0
- affected 8.4.0 – ≤ 8.4.0
- affected 8.3.0 – ≤ 8.3.0
- affected 8.2.1 – ≤ 8.2.1
- affected 8.2.0 – ≤ 8.2.0
- affected 8.1.2 – ≤ 8.1.2
- affected 8.1.1 – ≤ 8.1.1
- affected 8.1.0 – ≤ 8.1.0
- affected 8.0.1 – ≤ 8.0.1
- affected 8.0.0 – ≤ 8.0.0
- affected 7.88.1 – ≤ 7.88.1
- affected 7.88.0 – ≤ 7.88.0
- affected 7.87.0 – ≤ 7.87.0
- affected 7.86.0 – ≤ 7.86.0
- affected 7.85.0 – ≤ 7.85.0
- affected 7.84.0 – ≤ 7.84.0
- affected 7.83.1 – ≤ 7.83.1
- affected 7.83.0 – ≤ 7.83.0
- and 10 more
References (3)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-86409)Record last updated .