CVE-2026-8927

CRITICAL

curl - Env-Set Cross-Proxy Digest Auth State Leak

Title source: rule

Description

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`.

References (3)

Core 3

Core References

json

https://curl.se/docs/CVE-2026-8927.json

www

https://curl.se/docs/CVE-2026-8927.html

issue

https://hackerone.com/reports/3744543

Scores

CVSS v3 9.1

EPSS 0.0075

EPSS Percentile 50.7%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CISA SSVC

Vulnrichment

Exploitation poc

Automatable no

Technical Impact total

Details

CWE

CWE-294

Status published

Products (50)

curl/curl 7.12.0

curl/curl 7.12.1

curl/curl 7.12.2

curl/curl 7.12.3

curl/curl 7.13.0

curl/curl 7.13.1

curl/curl 7.13.2

curl/curl 7.14.0

curl/curl 7.14.1

curl/curl 7.15.0

... and 40 more

Published Jul 03, 2026

Tracked Since Jul 03, 2026