🛡️ CVE-2026-10536 on Alpine — curl

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

A use-after-free vulnerability exists in libcurl when an application

configures an HTTP/2 stream-dependency tree via CURLOPT_STREAM_DEPENDS or

CURLOPT_STREAM_DEPENDS_E, subsequently invokes curl_easy_reset(), and

finally terminates the handle with curl_easy_cleanup(). During this final

cleanup phase, libcurl attempts to access and modify an internal structure

that was already freed during the reset operation.

Distribution advisory

This page covers CVE-2026-10536 as tracked by Alpine, for the package curl. The fix is available in version 8.21.0-r0; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Affected software

ALPINE-CVE-2026-10536 is recorded against 1 package.

  • curl (from 7.88.0 up to 8.21.0-r0)

Timeline and source

Published on 3 July 2026 and last revised on 8 July 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

security.alpinelinux.org (Advisory)

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2026-07-03
Updated 2026-08-11
Modified 2026-07-08
Fix URL N/A

Affected Packages

Software From version Fixed in
curl 7.88.0 8.21.0-r0

Exploit Protection

Are you running curl?

ALPINE-CVE-2026-10536 carries CVSS 9.8 Critical rating. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.

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