High [CVE-2025-71436] arbitrary code execution via heap-based buffer overflow in language tag handling
This high-severity Red Hat Linux advisory covers CVE-2025-71436; related products: Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9.
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Summary
arbitrary code execution via heap-based buffer overflow in language tag handling. Red Hat rates this important (CVSS 7.1).
Weakness: CWE-787.
Affected products named by the advisory: Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat package: raptor2.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 13 hours ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 13 hours ago·verify at source
Mitigation checklist
- --- CME Mitigation Guidance (2026-10-20) --- Disclaimer: The following mitigation solutions are provided as a courtesy, pending the application of an official patch. This content was generated utilizing AI tools in conjunction with data from https://cmetaxonomy.org. Customers are advised to independently evaluate and test these temporary mitigations within their own infrastructure. The highest-value action is to enforce strict length validation on language tags in raptor2 literal constructors to prevent integer truncation and heap buffer overflows: upgrade to the fixed Raptor builds, which bounds language tag iteration by explicit length and validates language tag length limits up to 255 bytes, closing all 4 injection vectors (crafted Turtle document containing a language tag >= 256 bytes, crafted TriG document containing an oversized language tag, crafted N-Triples document containing an oversized language tag, crafted N-Quads document containing an oversized language tag). Until patched, this is a concern on Applications and automated ingestion services on any platform that use raptor2 to parse RDF data, so Restrict ingestion of untrusted RDF documents in automated processing pipelines and pre-filter input documents to reject language tags exceeding 255 bytes before passing them to raptor2. As a compensating measure, enable Address Space Layout Randomization to randomize application memory layout and hinder reliable control-flow redirection following heap corruption, compile parsing binaries with full RELRO and PIE to protect the Global Offset Table and randomize base addresses against heap overwrites, enforce Control Flow Integrity or Shadow Call Stack to validate indirect function call targets if heap corruption modifies function pointers, deploy EDR monitoring to detect anomalous process behavior and payload execution if heap exploitation occurs, deploy Falco or eBPF runtime security to alert on anomalous system calls and unexpected processes spawned by RDF parsing services, and enable NX/XD bit memory protection to maintain non-executable permissions on heap pages where oversized language tags are stored. These controls limit blast radius and contain exploitation, but they do not fix the underlying integer-truncation heap buffer overflow defect — apply the upstream patch to fully remediate. Highest-impact CME: CME-101 ASLR (Address Space Layout Randomization) (medium)
Official advisory · high-confidence parse· fetched 13 hours ago·verify at source
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