🛡️ CVE-2026-9079 — curl

🔴 CVSS 9.8 — Critical ⚠️ Exploit Public CWE-522 NVD
9.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

libcurl had a flaw that when instructed to clear proxy authentication

credentials which made it not do so, leaving the old credentials around to get

used for subsequent transfers that should not know nor use them.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Weakness class

CVE-2026-9079 is classified as CWE-522: Insufficiently Protected Credentials. Credentials are stored or transmitted with protection too weak for what they unlock.

Affected software

CVE-2026-9079 is recorded against 1 package.

  • curl (from 8.8.0 up to 8.21.0)

Timeline and source

Published on 3 July 2026 and last revised on 7 July 2026. A public exploit is known to exist, which raises the urgency of patching considerably. A vendor advisory or fix has been published. Record sourced from NVD.

References

curl.se
curl.se
hackerone.com
hackerone.com

Details

Severity CRITICAL
CVSS Score 9.8
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE CWE-522
Public Exploit ⚠️ Yes
Source NVD
Published 2026-07-03
Updated 2026-08-11
Modified 2026-07-07

Affected Packages

Software From version Fixed in
curl 8.8.0 8.21.0

References

Exploit, Issue Tracking, Third Party Advisory https://hackerone.com/reports/3750295
Exploit, Issue Tracking, Third Party Advisory https://hackerone.com/reports/3750295

Exploit Protection

Are you running curl?

CVE-2026-9079 carries CVSS 9.8 Critical rating and a public exploit already exists. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.

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