---
title: "CVE-2025-71436: Raptor RDF Syntax Library - Buffer Overflow"
description: "Raptor RDF Syntax Library 2.0.15 through 2.0.16 contains a heap-based buffer overflow caused by truncating language tag length to an unsigned char in raptor_new_term_from_counted_literal(), letting attackers supply long language tags to corrupt memory and possibly execute code."
url: https://panop.io/threat-heartbeat/CVE-2025-71436/
---

# CVE-2025-71436 Raptor RDF Syntax Library - Buffer Overflow

Raptor RDF Syntax Library 2.0.15 through 2.0.16 contains a heap-based buffer overflow caused by truncating language tag length to an unsigned char in raptor\_new\_term\_from\_counted\_literal(), letting attackers supply long language tags to corrupt memory and possibly execute code.

CVSS base score 7.1 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2025-71436)

## Details

Type

Buffer Overflow

Impact

Remote Code Execution, Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H

Published

20 October 2026

Updated

21 October 2026

Weakness

[CWE-122](https://cwe.mitre.org/data/definitions/122.html)

## Vendor fix

Update to a version later than 2.0.16 or the latest available version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2025-71436](https://nvd.nist.gov/vuln/detail/CVE-2025-71436)
- [https://github.com/dajobe/raptor/issues/83](https://github.com/dajobe/raptor/issues/83)
- [https://www.vulncheck.com/advisories/raptor-rdf-syntax-library-2.0.15-through-2.0.16-heap-buffer-overflow-via-language-tag](https://www.vulncheck.com/advisories/raptor-rdf-syntax-library-2.0.15-through-2.0.16-heap-buffer-overflow-via-language-tag)
- [https://github.com/dajobe/raptor/blob/raptor2\_2\_0\_16/src/raptor\_term.c#L200-L218](https://github.com/dajobe/raptor/blob/raptor2_2_0_16/src/raptor_term.c#L200-L218)
- [https://github.com/dajobe/raptor/blob/raptor2\_2\_0\_16/src/raptor\_term.c#L270-L287](https://github.com/dajobe/raptor/blob/raptor2_2_0_16/src/raptor_term.c#L270-L287)
- [https://github.com/dajobe/raptor/commit/361a803a72817ae771db2438277229e6541e1575](https://github.com/dajobe/raptor/commit/361a803a72817ae771db2438277229e6541e1575)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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