CVE-2026-11856
An attacker can exploit multiple vulnerabilities in cURL to bypass security measures, disclose confidential information, or cause a denial-of-service condition or memory corruption.
CSIRTS triage
- What
- Multiple vulnerabilities allow an attacker to bypass security measures, disclose information, or cause denial-of-service or memory corruption.
- Who is affected
- Deployments of cURL are affected.
- Urgency
- Remediation is important to prevent potential exploitation of these vulnerabilities.
- Action
- Update cURL to the latest version.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Moderate exploitation risk1.1% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 61% of all EPSS-scored CVEs.
Advisory coverage (4)
- medium[UPDATE] [medium] cURL: Multiple vulnerabilitiescert-bund · 2026-07-10
- criticalCVE-2026-11856: Successfully using libcurl to do a transfer to a specific HTTP origin (`hostA`) with **Digest*…nvd · 2026-07-03
- mediumCVE-2026-11856: cross-origin Digest auth state leakmsrc · 2026-07-02
- unknownMultiple vulnerabilities in cURL and libcurl (June 24, 2026)cert-fr-avis · 2026-06-24
External references
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