Answer in brief
CVE-2026-125709 records a Medium severity (CVSS 4.2) vulnerability in Libstdc++: overflow leaves streambuf in inconsistent state on i/o error.. The current sources do not mark it as known exploited. The current feed maps Red Hat/compat-gcc-295 (generic), Red Hat/compat-gcc-296 (generic), Red Hat/compat-gcc-32 (generic), Red Hat/compat-gcc-34 (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 4.2. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Red Hat/compat-gcc-295 (generic), Red Hat/compat-gcc-296 (generic), Red Hat/compat-gcc-32 (generic), Red Hat/compat-gcc-34 (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Red Hat/compat-gcc-295generic | * | Not reported |
| Red Hat/compat-gcc-296generic | * | Not reported |
| Red Hat/compat-gcc-32generic | * | Not reported |
| Red Hat/compat-gcc-34generic | * | Not reported |
| Red Hat/compat-gcc-44generic | * | Not reported |
| Red Hat/gccgeneric | * | Not reported |
| Red Hat/gcc13generic | * | Not reported |
| Red Hat/gcc-toolset-15-gccgeneric | * | Not reported |
| Red Hat/gcc-toolset-16-gccgeneric | * | Not reported |
| Red Hat/mingw-gccgeneric | * | Not reported |
| Red Hat/openshift/ose-rhel-coreos-8generic | * | Not reported |
| Red Hat/openshift/ose-rhel-coreos-9generic | * | Not reported |
Published upstream
Nov 10, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 10, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Nov 10, 2026
A flaw was found in libstdc++. When a byte-by-byte write operation fails during file stream processing, the library may still append data into the internal memory buffer. An attacker capable of inducing repeated write failures in an affected service can trigger a buffer overflow, potentially resulting in a Denial of Service (DoS) or memory corruption.
Quoted source text, attributed separately from HOL analysis.