by Kastro
Paper/Archive/CVE-2026-8924

CVE-2026-8924

curl curl — trailing dot domain super cookie

EPSS 0.7%public exploitCVSS 9.1
critical.is priorityof 100
48
CVSS 9.1 (ADP)9.1 / 10 × 3027.3Not in CISA KEV+300.0EPSS percentile 51.6.516 × 2010.3Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

A flaw in curl’s cookie parsing logic allows a malicious HTTP server to set "super cookies" that bypass the Public Suffix List check. This enables an attacker-controlled origin to inject cookies that curl subsequently scopes and transmits to unrelated third-party domains.

Affected

ProductAffectedFixed inSource
curl7.46.0 – < 8.14.28.14.2CNA
curl8.15.0 – < 8.16.18.16.1CNA
curl8.17.0 – < 8.20.18.20.1CNA
curle77b5b7453c1e8ccd7ec0816890d98e2f392e465 – < 51beed175dbfc37da3113f6acce60c630c070ce851beed175dbfc37da3113f6acce60c630c070ce8CNA
curl8.20.0–CNA
curl8.19.0–CNA
curl8.18.0–CNA
curl8.17.0–CNA
curl8.16.0–CNA
curl8.15.0–CNA
curl8.14.1–CNA
curl8.14.0–CNA

Scores by source

CISA ADP9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CISA ADPSSVCExploitation: poc · Automatable: yes · Technical impact: total

References

refcurl.se/docs/CVE-2026-8924.jsonrefcurl.se/docs/CVE-2026-8924.htmlexploithackerone.com/reports/3733905