CVE-2026-8927env-set cross-proxy Digest auth state leak
- 9.1CriticalCVSS base score
- 0.50%Exploitation in 30 daysEPSS · top 57% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- YesPublic exploitsa reference or SSVC says so
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`.
Public exploit
An exploit or proof of concept is public: anyone can try it against an unpatched system. A reference of the record is tagged as an exploit. CISA's SSVC rates its exploitation: a proof of concept is public.
Show the exploits1
References tagged exploit1 reference
Timeline
ID reserved
By curl
- 45 days later
· 45 days later
Published
- 2 months later
· 2 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| CISA-ADPADP (enrichment) | 3.1 | Critical9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
| NVDNVD · Modified | 3.1 | Critical9.1 | CVSS: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 (13 Nov 2026)
- CISA SSVC
- Exploitation: poc · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.1.
Affected products
- affected 7.12.0 – < 8.14.2
- affected 8.15.0 – < 8.16.1
- affected 8.17.0 – < 8.20.1
- affected fc6eff13b5414caf6edf22d73a3239e074a04216 – < 5c225384b8d52c67ce8259c6e4203bc57aacb567
- 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
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)
- EUVD EUVD-2026-41508 (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://cveledger.app/cve/CVE-2026-8927)Record last updated .