[UPDATE] [medium] cURL: Multiple vulnerabilities
An attacker can exploit multiple vulnerabilities in cURL to bypass security measures, disclose confidential information, manipulate data, or cause a Denial-of-Service condition.
CSIRTS triage
- What
- An attacker can exploit multiple vulnerabilities in cURL to bypass security measures, disclose confidential information, manipulate data, or cause a Denial-of-Service condition.
- Who is affected
- Deployments of cURL are affected.
- Urgency
- Remediation is medium urgency as the vulnerabilities can lead to various security issues but are not currently exploited.
- Action
- Update to the latest version of cURL.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-2065
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-82860.52% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 40% of all scored CVEs.
- Low exploitation riskCVE-2026-84580.54% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 42% of all scored CVEs.
- Low exploitation riskCVE-2026-89240.65% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 47% of all scored CVEs.
- Moderate exploitation riskCVE-2026-89251.1% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 61% of all scored CVEs.
- Low exploitation riskCVE-2026-89260.61% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 45% of all scored CVEs.
- Low exploitation riskCVE-2026-89270.75% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 51% of all scored CVEs.
- Low exploitation riskCVE-2026-89320.37% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 29% of all scored CVEs.
- Moderate exploitation riskCVE-2026-90791.1% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 61% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-8286 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-8458 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-8924 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-8925 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-8926 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-8927 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-8932 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-9079 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- criticalCVE-2026-9079: libcurl had a flaw that when instructed to clear proxy authentication credentials which made it…nvd
- highCVE-2026-8932: libcurl would reuse a previously created connection even when some mTLS config related option h…nvd
- criticalCVE-2026-8927: When reusing a libcurl handle for sequential transfers driven by environment-variable proxy con…nvd
- criticalCVE-2026-8926: When asking curl to use a `.netrc` file to find credentials and at the same time specifying a U…nvd
- criticalCVE-2026-8925: The curl logic that works with SASL authentication could end up cleaning up the GSASL context *…nvd
- criticalCVE-2026-8924: A flaw in curl’s cookie parsing logic allows a malicious HTTP server to set 'super cookies' tha…nvd
- mediumCVE-2026-8458: libcurl might in some circumstances reuse the wrong connection when asked to do Negotiate-authe…nvd
- highCVE-2026-8286: A vulnerability exists where a new transfer that uses STARTTLS to upgrade the connection might …nvd
- unknownCVE-2026-9079: stale proxy password leakmsrc
- criticalCVE-2026-8924: trailing dot domain super cookiemsrc
- mediumCVE-2026-8927: env-set cross-proxy Digest auth state leakmsrc
- highCVE-2026-8286: wrong STARTTLS connection reusemsrc
Recent advisories for cURL
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- high[UPDATE] [high] cURL: Multiple vulnerabilitiescert-bund · 2026-07-10
- medium[UPDATE] [medium] cURL: Vulnerability allows information disclosurecert-bund · 2026-07-10
- medium[UPDATE] [medium] cURL: Multiple vulnerabilitiescert-bund · 2026-07-10
- medium[UPDATE] [medium] cURL: Vulnerability allows bypassing security measurescert-bund · 2026-07-10
- unknownUSN-8525-1: curl vulnerabilitiesubuntu · 2026-07-09
- highCVE-2026-9080: Calling `curl_easy_pause()` within the event-based `CURLMOPT_SOCKETFUNCTION` callback triggers …nvd · 2026-07-03
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