CVE-2026-8927
9.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Summary
When reusing a libcurl handle for sequential transfers driven by
environment-variable proxy configuration, libcurl fails to clear the proxy
authentication state between requests. Specifically, if the initial transfer
authenticates against proxyA using Digest auth, a subsequent transfer routed
through proxyB erroneously leaks the Proxy-Authorization: header intended
solely for proxyA.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| curl | curl | 7.12.0 < 8.14.2 | affected |
| curl | curl | 8.15.0 < 8.16.1 | affected |
| curl | curl | 8.17.0 < 8.20.1 | affected |
| curl | curl | fc6eff13b5414caf6edf22d73a3239e074a04216 < 5c225384b8d52c67ce8259c6e4203bc57aacb567 | affected |
| curl | curl | 8.20.0 | affected |
| curl | curl | 8.19.0 | affected |
| curl | curl | 8.18.0 | affected |
| curl | curl | 8.17.0 | affected |
| curl | curl | 8.16.0 | affected |
| curl | curl | 8.15.0 | affected |
| curl | curl | 8.14.1 | affected |
| curl | curl | 8.14.0 | affected |
| curl | curl | 8.13.0 | affected |
| curl | curl | 8.12.1 | affected |
| curl | curl | 8.12.0 | affected |
| curl | curl | 8.11.1 | affected |
| curl | curl | 8.11.0 | affected |
| curl | curl | 8.10.1 | affected |
| curl | curl | 8.10.0 | affected |
| curl | curl | 8.9.1 | affected |
| curl | curl | 8.9.0 | affected |
| curl | curl | 8.8.0 | affected |
| curl | curl | 8.7.1 | affected |
| curl | curl | 8.7.0 | affected |
| curl | curl | 8.6.0 | affected |
| curl | curl | 8.5.0 | affected |
| curl | curl | 8.4.0 | affected |
| curl | curl | 8.3.0 | affected |
| curl | curl | 8.2.1 | affected |
| curl | curl | 8.2.0 | affected |
| curl | curl | 8.1.2 | affected |
| curl | curl | 8.1.1 | affected |
| curl | curl | 8.1.0 | affected |
| curl | curl | 8.0.1 | affected |
| curl | curl | 8.0.0 | affected |
| curl | curl | 7.88.1 | affected |
| curl | curl | 7.88.0 | affected |
| curl | curl | 7.87.0 | affected |
| curl | curl | 7.86.0 | affected |
| curl | curl | 7.85.0 | affected |
| curl | curl | 7.84.0 | affected |
| curl | curl | 7.83.1 | affected |
| curl | curl | 7.83.0 | affected |
| curl | curl | 7.82.0 | affected |
| curl | curl | 7.81.0 | affected |
| curl | curl | 7.80.0 | affected |
| curl | curl | 7.79.1 | affected |
| curl | curl | 7.79.0 | affected |
| curl | curl | 7.78.0 | affected |
| curl | curl | 7.77.0 | affected |
| curl | curl | 7.76.1 | affected |
| curl | curl | 7.76.0 | affected |
| curl | curl | 7.75.0 | affected |
| curl | curl | 7.74.0 | affected |
| curl | curl | 7.73.0 | affected |
| curl | curl | 7.72.0 | affected |
| curl | curl | 7.71.1 | affected |
| curl | curl | 7.71.0 | affected |
| curl | curl | 7.70.0 | affected |
| curl | curl | 7.69.1 | affected |
| curl | curl | 7.69.0 | affected |
| curl | curl | 7.68.0 | affected |
| curl | curl | 7.67.0 | affected |
| curl | curl | 7.66.0 | affected |
| curl | curl | 7.65.3 | affected |
| curl | curl | 7.65.2 | affected |
| curl | curl | 7.65.1 | affected |
| curl | curl | 7.65.0 | affected |
| curl | curl | 7.64.1 | affected |
| curl | curl | 7.64.0 | affected |
| curl | curl | 7.63.0 | affected |
| curl | curl | 7.62.0 | affected |
| curl | curl | 7.61.1 | affected |
| curl | curl | 7.61.0 | affected |
| curl | curl | 7.60.0 | affected |
| curl | curl | 7.59.0 | affected |
| curl | curl | 7.58.0 | affected |
| curl | curl | 7.57.0 | affected |
| curl | curl | 7.56.1 | affected |
| curl | curl | 7.56.0 | affected |
| curl | curl | 7.55.1 | affected |
| curl | curl | 7.55.0 | affected |
| curl | curl | 7.54.1 | affected |
| curl | curl | 7.54.0 | affected |
| curl | curl | 7.53.1 | affected |
| curl | curl | 7.53.0 | affected |
| curl | curl | 7.52.1 | affected |
| curl | curl | 7.52.0 | affected |
| curl | curl | 7.51.0 | affected |
| curl | curl | 7.50.3 | affected |
| curl | curl | 7.50.2 | affected |
| curl | curl | 7.50.1 | affected |
| curl | curl | 7.50.0 | affected |
| curl | curl | 7.49.1 | affected |
| curl | curl | 7.49.0 | affected |
| curl | curl | 7.48.0 | affected |
| curl | curl | 7.47.1 | affected |
| curl | curl | 7.47.0 | affected |
| curl | curl | 7.46.0 | affected |
| curl | curl | 7.45.0 | affected |
| curl | curl | 7.44.0 | affected |
| curl | curl | 7.43.0 | affected |
| curl | curl | 7.42.1 | affected |
| curl | curl | 7.42.0 | affected |
| curl | curl | 7.41.0 | affected |
| curl | curl | 7.40.0 | affected |
| curl | curl | 7.39.0 | affected |
| curl | curl | 7.38.0 | affected |
| curl | curl | 7.37.1 | affected |
| curl | curl | 7.37.0 | affected |
| curl | curl | 7.36.0 | affected |
| curl | curl | 7.35.0 | affected |
| curl | curl | 7.34.0 | affected |
| curl | curl | 7.33.0 | affected |
| curl | curl | 7.32.0 | affected |
| curl | curl | 7.31.0 | affected |
| curl | curl | 7.30.0 | affected |
| curl | curl | 7.29.0 | affected |
| curl | curl | 7.28.1 | affected |
| curl | curl | 7.28.0 | affected |
| curl | curl | 7.27.0 | affected |
| curl | curl | 7.26.0 | affected |
| curl | curl | 7.25.0 | affected |
| curl | curl | 7.24.0 | affected |
| curl | curl | 7.23.1 | affected |
| curl | curl | 7.23.0 | affected |
| curl | curl | 7.22.0 | affected |
| curl | curl | 7.21.7 | affected |
| curl | curl | 7.21.6 | affected |
| curl | curl | 7.21.5 | affected |
| curl | curl | 7.21.4 | affected |
| curl | curl | 7.21.3 | affected |
| curl | curl | 7.21.2 | affected |
| curl | curl | 7.21.1 | affected |
| curl | curl | 7.21.0 | affected |
| curl | curl | 7.20.1 | affected |
| curl | curl | 7.20.0 | affected |
| curl | curl | 7.19.7 | affected |
| curl | curl | 7.19.6 | affected |
| curl | curl | 7.19.5 | affected |
| curl | curl | 7.19.4 | affected |
| curl | curl | 7.19.3 | affected |
| curl | curl | 7.19.2 | affected |
| curl | curl | 7.19.1 | affected |
| curl | curl | 7.19.0 | affected |
| curl | curl | 7.18.2 | affected |
| curl | curl | 7.18.1 | affected |
| curl | curl | 7.18.0 | affected |
| curl | curl | 7.17.1 | affected |
| curl | curl | 7.17.0 | affected |
| curl | curl | 7.16.4 | affected |
| curl | curl | 7.16.3 | affected |
| curl | curl | 7.16.2 | affected |
| curl | curl | 7.16.1 | affected |
| curl | curl | 7.16.0 | affected |
| curl | curl | 7.15.5 | affected |
| curl | curl | 7.15.4 | affected |
| curl | curl | 7.15.3 | affected |
| curl | curl | 7.15.2 | affected |
| curl | curl | 7.15.1 | affected |
| curl | curl | 7.15.0 | affected |
| curl | curl | 7.14.1 | affected |
| curl | curl | 7.14.0 | affected |
| curl | curl | 7.13.2 | affected |
| curl | curl | 7.13.1 | affected |
| curl | curl | 7.13.0 | affected |
| curl | curl | 7.12.3 | affected |
| curl | curl | 7.12.2 | affected |
| curl | curl | 7.12.1 | affected |
| curl | curl | 7.12.0 | affected |
Weaknesses
- CWE-294: Authentication Bypass by Capture-replay
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: poc
- Automatable: no
- Technical Impact: total
Additional References
References
- https://curl.se/docs/CVE-2026-8927.json
- https://curl.se/docs/CVE-2026-8927.html
- https://hackerone.com/reports/3744543
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