[UPDATE] [medium] cURL: Multiple vulnerabilities

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.

Details

Source

CERT-Bund (BSI) Security Advisories (DE · national-cert · site)

Severity

medium

Published

2026-07-10

Exploitation

Not in CISA KEV at last sync

Language

Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-2052

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-2026-105360.89% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 55% 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-2026-115640.61% 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-2026-115860.86% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 54% 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-2026-120640.57% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 43% of all scored CVEs.
• Low exploitation riskCVE-2026-90800.49% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 39% of all scored CVEs.
• Low exploitation riskCVE-2026-95450.41% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 33% 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.
• Low exploitation riskCVE-2026-95470.51% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 40% of all scored CVEs.

Referenced CVEs

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

• unknownUSN-8525-1: curl vulnerabilitiesubuntu
• 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
• highCVE-2026-12064: When a user invokes curl using a schemeless URL combined with `--proto-default` sftp (or scp),…nvd
• criticalCVE-2026-11856: Successfully using libcurl to do a transfer to a specific HTTP origin (`hostA`) with **Digest*…nvd
• highCVE-2026-11586: By default, curl automatically responds to WebSocket PING frames. Because curl lacks an upper …nvd
• criticalCVE-2026-11564: libcurl keeps previously used connections in a connection pool for subsequent transfers to reu…nvd
• highCVE-2026-11352: An issue in curl’s QUIC UDP receive function allows a malicious HTTP/3 server to trigger a rem…nvd
• criticalCVE-2026-10536: A use-after-free vulnerability exists in libcurl when an application configures an HTTP/2 stre…nvd
• lowCVE-2026-9080: UAF after pause in socket callbackmsrc

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: Vulnerability allows bypassing security measurescert-bund · 2026-07-10
• unknownUSN-8525-1: curl vulnerabilitiesubuntu · 2026-07-09
• medium[UPDATE] [medium] cURL: Multiple vulnerabilitiescert-bund · 2026-07-03
• highCVE-2026-9080: Calling `curl_easy_pause()` within the event-based `CURLMOPT_SOCKETFUNCTION` callback triggers …nvd · 2026-07-03

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