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Vulnerability record · CVE-2017-8818 · published 29 November 2017

CVE-2017-8818: Haxx curl memory buffer overflow vulnerability

Haxx · Curl

curl and libcurl before 7.57.0 on 32-bit platforms allow attackers to cause a denial of service (out-of-bounds access and application crash) or possibly have unspecified other impact because too little memory is allocated for interfacing to an SSL library.

9.8 CVSS 3.0 Critical EPSS 3.8% · top 10.3% CWE-119 · Memory buffer overflow
9.8CVSS 3.0 base score, v2 7.5
3.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
10References
17 Jun 2026Last modified by NVD

Description

curl and libcurl before 7.57.0 on 32-bit platforms allow attackers to cause a denial of service (out-of-bounds access and application crash) or possibly have unspecified other impact because too little memory is allocated for interfacing to an SSL library.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://security.cucumberlinux.com/security/details.php?id=163 Third Party Advisory
http://www.securityfocus.com/bid/102014 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1039898 Third Party AdvisoryVDB Entry
https://curl.haxx.se/docs/adv_2017-af0a.html PatchVendor Advisory
https://security.gentoo.org/glsa/201712-04 Third Party Advisory
http://security.cucumberlinux.com/security/details.php?id=163 Third Party Advisory
http://www.securityfocus.com/bid/102014 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1039898 Third Party AdvisoryVDB Entry
https://curl.haxx.se/docs/adv_2017-af0a.html PatchVendor Advisory
https://security.gentoo.org/glsa/201712-04 Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2026-19931Haxx curl vulnerabilityA flaw in libcurl makes it wrongly reuse an HTTP connection setup for a given hostname using Negotiate authentication, when the initial request is do…EPSS 0.75%9.8CVE-2026-9079Haxx curl insufficiently protected credentials vulnerabilitylibcurl had a flaw that when instructed to clear proxy authentication credentials which made it not do so, leaving the old credentials around to get …EPSS 0.58%9.8CVE-2026-8925Haxx curl double free vulnerabilityThe curl logic that works with SASL authentication could end up cleaning up the GSASL context *twice* without clearing the pointer in between, making…EPSS 1.1%9.8CVE-2026-10536Haxx curl use after free vulnerabilityA use-after-free vulnerability exists in libcurl when an application configures an HTTP/2 stream-dependency tree via `CURLOPT_STREAM_DEPENDS` or `CUR…EPSS 0.60%9.8CVE-2026-11856Haxx curl authentication bypass by capture-replay vulnerabilitySuccessfully using libcurl to do a transfer to a specific HTTP origin (`hostA`) with **Digest** authentication and then changing the origin to a diff…EPSS 0.69%9.8CVE-2023-38545curl SOCKS5 proxy handshake heap buffer overflowcurl contains a heap-based out-of-bounds write (CWE-787) in the SOCKS5 proxy handshake. When a host name longer than 255 bytes is passed for proxy-si…EPSS 78%analysed9.8CVE-2022-32221Haxx curl information exposure vulnerabilityWhen doing HTTP(S) transfers, libcurl might erroneously use the read callback (`CURLOPT_READFUNCTION`) to ask for data to send, even when the `CURLOP…EPSS 4.4%9.8CVE-2022-32207Haxx curl incorrect default permissions vulnerabilityWhen curl < 7.84.0 saves cookies, alt-svc and hsts data to local files, it makes the operation atomic by finalizing the operation with a rename from …EPSS 7.7%

Source: NIST National Vulnerability Database (record CVE-2017-8818), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.