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CVSS 9.1 · CRITICAL

CVE-2026-8924

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.

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Analysis

A critical vulnerability in curl's cookie parsing logic allows malicious servers to bypass Public Suffix List restrictions. Attackers can inject 'super cookies' that curl will then transmit to unrelated third-party domains, potentially leading to session hijacking or sensitive data exposure across the web.

Relevant roles

BackendCyberSecurityLinuxCDockerPython

Severity

Score: 9.1(CRITICAL)
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
AV: NETWORK
AC: LOW
PR: NONE
UI: NONE
S: UNCHANGED
C: HIGH
I: HIGH
A: NONE

EPSS

Probability of exploitation (next 30 days): 0.0022 (0.2%)
Percentile: 12.4%
EPSS: 2026-07-06

Technical description

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.

Published: 7/3/2026, 7:16:24 AM
Last modified: 7/6/2026, 6:20:47 PM

References

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