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CVE-2026-8927

env-set cross-proxy Digest auth state leak

Critical9.1EPSS 0.50%
Published
Updated
Reserved
Assigned by
curl

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`.

Scores

CVSS scores of CVE-2026-8927, by who scored it
Scored byCVSSScoreVector
CISA-ADPADP (enrichment)3.1Critical9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
NVDNVD · Modified3.1Critical9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS (exploitation in 30 days)
0.50% · top 57% of all CVEs (6 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: Critical 9.1.

Weakness

Affected products

  • curl · curl

    • affected 7.12.0 – < 8.14.2
    • affected 8.15.0 – < 8.16.1
    • affected 8.17.0 – < 8.20.1

  • curl · curl

    • affected fc6eff13b5414caf6edf22d73a3239e074a04216 – < 5c225384b8d52c67ce8259c6e4203bc57aacb567

  • curl · curl

    • affected 8.20.0
    • affected 8.19.0
    • affected 8.18.0
    • affected 8.17.0
    • affected 8.16.0
    • affected 8.15.0
    • affected 8.14.1
    • affected 8.14.0
    • affected 8.13.0
    • affected 8.12.1
    • affected 8.12.0
    • affected 8.11.1
    • affected 8.11.0
    • affected 8.10.1
    • affected 8.10.0
    • affected 8.9.1
    • affected 8.9.0
    • affected 8.8.0
    • affected 8.7.1
    • affected 8.7.0
    • affected 8.6.0
    • affected 8.5.0
    • affected 8.4.0
    • affected 8.3.0
    • affected 8.2.1
    • affected 8.2.0
    • affected 8.1.2
    • affected 8.1.1
    • affected 8.1.0
    • affected 8.0.1
    • affected 8.0.0
    • affected 7.88.1
    • affected 7.88.0
    • affected 7.87.0
    • affected 7.86.0
    • affected 7.85.0
    • affected 7.84.0
    • affected 7.83.1
    • affected 7.83.0
    • affected 7.82.0
    • and 126 more

References (3)

Sources

The same CVE in the primary databases and aggregators, to check against.

Badge for a README or a ticket

CVE-2026-8927 badge
[![CVE-2026-8927](https://trackcve.app/badge/CVE-2026-8927.svg)](https://trackcve.app/cve/CVE-2026-8927)

Record last updated .