Critical 9.1Published Jul 3, 2026

CVE-2026-8927env-set cross-proxy Digest auth state leak

Updated under an hour ago (Oct 26, 2026, 4:30 PM ET)

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It affects curl and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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`.

CVSS: 9.1 CRITICAL (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Weakness (CWE): CWE-294
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: curl
NVD analysis: Modified
Record last updated: Sep 15, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

curl curl curl:curl (from the name)	from 7.12.0 before 8.14.2; from 8.15.0 before 8.16.1; from 8.17.0 before 8.20.1	CNA record
haxx curl haxx:curl	from 7.12.0 before 8.21.0	NVD

References

References

https://curl.se/docs/CVE-2026-8927.json	vendor-advisory
https://curl.se/docs/CVE-2026-8927.html	patch, vendor-advisory
https://hackerone.com/reports/3744543	exploit, issue-tracking, third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.