# CVE-2026-88387

> As of 2026-09-29, CVE-2026-88387 is a MEDIUM-severity vulnerability, CVSS v3.1 5.5, EPSS 0.1% (1.5th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-88387 as of 2026-09-29; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-09-29

## What is CVE-2026-88387?

LibRaw 0.22.0 contains an incorrect numeric conversion vulnerability in LibRaw::parse_tiff_ifd() when processing TIFF tag 0x00fe (NewSubfileType). A specially crafted RAW, TIFF, or DNG file can supply an attacker-controlled NewSubfileType value outside the range of a signed int. The parser converts this value and narrows it to int without performing range validation. This out-of-range conversion triggers undefined behavior, resulting in process termination and denial of service.

The record classifies CVE-2026-88387 under weakness class [CWE-681](https://cwe.mitre.org/data/definitions/681.html). Its CVSS v3 base vector states that the flaw requires local access to the host, needs no prior authentication, needs a user to take an action first, and has high impact on availability. The identifier was first published 11 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 5.5 — MEDIUM (`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H`)
- **EPSS (FIRST):** 0.1% probability of exploitation in the next 30 days, higher than 1.5% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 2.8/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-09-24, last modified 2026-09-29

## Is CVE-2026-88387 being exploited?

It currently carries a trending score of 29 in the Threadlinqs vulnerability feed.

## Affected products and versions

No affected-product or package list has been recorded for CVE-2026-88387 in the tracked sources. The vendor advisory and the references below are the authoritative statement of what is affected.

## How to fix CVE-2026-88387

No vendor patch reference has been recorded for CVE-2026-88387 in the tracked sources. Follow the references below for a fix, and treat any affected deployment as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-88387

No threat campaign in the Threadlinqs corpus currently references CVE-2026-88387, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, NVD, FIRST EPSS. Last verified by Threadlinqs on 2026-09-30. This product uses the NVD API but is not endorsed or certified by the NVD.

**Other references**

- [github.com](https://github.com/LibRaw/LibRaw/issues/844)
- [github.com (853)](https://github.com/LibRaw/LibRaw/pull/853)
- [github.com (b41cbbd61951783e0440590dae55411a16185bdf)](https://github.com/LibRaw/LibRaw/commit/b41cbbd61951783e0440590dae55411a16185bdf)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-88387
Full detection coverage and IOCs for threats exploiting CVE-2026-88387 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp