Multiple vulnerabilities in cURL and libcurl (June 24, 2026)
Multiple vulnerabilities have been discovered in cURL and libcurl. Some of them allow an attacker to cause remote denial of service, a breach of data confidentiality, and a security policy bypass.
CSIRTS triage
- What
- Multiple vulnerabilities allow for denial of service, data confidentiality breaches, and security policy bypass.
- Who is affected
- Users of cURL and libcurl.
- Urgency
- Remediation is important as vulnerabilities could lead to significant security issues.
- Action
- Upgrade to the latest versions of cURL and libcurl.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-0797/
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-2026-89260.61% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 45% of all scored CVEs.
- Moderate exploitation riskCVE-2026-113521.0% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 59% 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-2026-95460.65% 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-2022-277822.6% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 84% of all scored CVEs.
- Low exploitation riskCVE-2026-105360.89% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 55% 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-2026-118561.1% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 61% of all scored CVEs.
- Low exploitation riskCVE-2026-115860.86% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 54% of all scored CVEs.
- Low exploitation riskCVE-2026-120640.57% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 43% of all scored CVEs.
Referenced CVEs
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- high[UPDATE] [high] cURL: Multiple vulnerabilitiescert-bund
- medium[UPDATE] [medium] cURL: Multiple vulnerabilitiescert-bund
- unknownUSN-8525-1: curl vulnerabilitiesubuntu
- medium[UPDATE] [medium] cURL: Multiple vulnerabilitiescert-bund
- highCVE-2026-9547: When a libcurl-based application performs transfers via `SCP://` or `SFTP://` and utilizes the …nvd
- highCVE-2026-9546: A vulnerability in libcurl caused the HTTP `Referer:` header to persist even when explicitly cl…nvd
- highCVE-2026-9545: In this scenario, libcurl first uses a proper HTTP/3 server for the initial transfers, and when…nvd
- highCVE-2026-9080: Calling `curl_easy_pause()` within the event-based `CURLMOPT_SOCKETFUNCTION` callback triggers …nvd
- 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
Recent advisories for cURL and libcurl
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.
- highCVE-2026-9080: Calling `curl_easy_pause()` within the event-based `CURLMOPT_SOCKETFUNCTION` callback triggers …nvd · 2026-07-03
- highCVE-2026-12064: When a user invokes curl using a schemeless URL combined with `--proto-default` sftp (or scp),…nvd · 2026-07-03
- highCVE-2026-11352: An issue in curl’s QUIC UDP receive function allows a malicious HTTP/3 server to trigger a rem…nvd · 2026-07-03
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