Out-of-bounds Write Affecting glibc package, versions <2.26-4
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-ECHOLATEST-GLIBC-18610929
- published11 Aug 2026
- disclosed31 Jan 2018
Introduced: 31 Jan 2018
CVE-2018-1000001 (opens in a new tab)How to fix?
Upgrade Echo:latest glibc to version 2.26-4 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream glibc package and not the glibc package as distributed by Echo.
See How to fix? for Echo:latest relevant fixed versions and status.
In glibc 2.26 and earlier there is confusion in the usage of getcwd() by realpath() which can be used to write before the destination buffer leading to a buffer underflow and potential code execution.
References
- https://advisory.echohq.com/cve/CVE-2018-1000001
- http://seclists.org/oss-sec/2018/q1/38
- http://www.securityfocus.com/bid/102525
- http://www.securitytracker.com/id/1040162
- https://access.redhat.com/errata/RHSA-2018:0805
- https://security.netapp.com/advisory/ntap-20190404-0003/
- https://usn.ubuntu.com/3534-1/
- https://usn.ubuntu.com/3536-1/
- https://www.exploit-db.com/exploits/43775/
- https://www.exploit-db.com/exploits/44889/
- https://www.halfdog.net/Security/2017/LibcRealpathBufferUnderflow/
- https://www.exploit-db.com/exploits/44889
- https://github.com/0x00-0x00/CVE-2018-1000001