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libcurl CVE-2026-9080

| EUVDEUVD-2026-41511 HIGH
Use After Free (CWE-416)
2026-06-24 GHSA-hf34-v47h-w6m3
Information Disclosure Use After Free Memory Corruption Curl
7.3
CVSS 3.1 · Vendor
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Severity by source

Vendor (CNA) PRIMARY
7.3 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
vuln.today AI
5.6 MEDIUM

AC:H because the flaw only triggers in apps that call curl_easy_pause() inside the socket callback with race-like timing; UAF yields limited C/I/A impact, no auth needed so PR:N.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
4.0 AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
SUSE
5.9 MEDIUM
AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Primary rating from Vendor (CNA).

CVSS VectorVendor

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low

Lifecycle Timeline

7
Analysis Updated
Jul 06, 2026 - 18:45 vuln.today
v5 (cvss_changed)
Analysis Updated
Jul 06, 2026 - 18:45 vuln.today
v4 (cvss_changed)
Analysis Updated
Jul 06, 2026 - 18:44 vuln.today
v3 (cvss_changed)
Analysis Updated
Jul 06, 2026 - 18:43 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Jul 06, 2026 - 18:22 vuln.today
cvss_changed
CVSS changed
Jul 06, 2026 - 18:22 NVD
7.3 (HIGH)
Analysis Generated
Jun 24, 2026 - 18:25 vuln.today

Description PRE-NVD

Disclosed via oss-security. NVD scoring and full description are pending.

Articles & Coverage 1

News Critical Use-After-Free in OpenSSL - CVE-2026-9080 Jun 24, 2026

AnalysisAI

Use-after-free in libcurl 8.13.0 through 8.20.0 occurs when an application calls curl_easy_pause() from inside an event-based CURLMOPT_SOCKETFUNCTION callback, causing libcurl to write a flag through a struct pointer whose backing memory was just freed. Affected are applications built on the curl multi interface using event-based socket callbacks; the flaw can lead to memory corruption or limited information disclosure (tagged Information Disclosure) with low confidentiality, integrity, and availability impact. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Reach libcurl app using event-based multi interface
Delivery
Server drives socket activity into CURLMOPT_SOCKETFUNCTION callback
Exploit
Application calls curl_easy_pause() during callback
Execution
libcurl writes flag via freed struct pointer
Impact
Use-after-free corrupts heap or leaks memory
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the host application (1) uses libcurl's multi interface in event-based mode with a registered CURLMOPT_SOCKETFUNCTION socket callback, and (2) calls curl_easy_pause() from inside that callback - this exact pattern is the triggering condition, per the description. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The supplied CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L, score 7.3) rates this network-reachable, low-complexity, unauthenticated with low impact across CIA, but that scoring is in tension with the description: exploitation is not a straightforward remote request against a listening service - it only manifests when the host application itself uses the curl_easy_pause()-inside-socket-callback pattern, which is an application coding condition, not an attacker-supplied one. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An application uses libcurl's event-based multi interface and, inside its CURLMOPT_SOCKETFUNCTION callback, calls curl_easy_pause() in response to socket activity driven by a remote server. A malicious or misbehaving server times its responses so the callback fires and pauses at the moment the transfer struct is freed, causing libcurl to write through the dangling pointer and corrupt heap memory or leak adjacent data. …
Remediation Patch available per vendor advisory: upgrade libcurl to the fixed release referenced in the curl security advisory at https://curl.se/docs/CVE-2026-9080.html (the input does not state an exact fixed version, so confirm the patched tag directly from that advisory rather than assuming one). … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Inventory systems running libcurl 8.13.0 through 8.20.0; identify applications using curl_easy_pause() within CURLMOPT_SOCKETFUNCTION callbacks. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
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CVE-2026-9080 vulnerability details – vuln.today
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