Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2021-3826

CVE-2021-3826MEDIUM

n/a gcc — Heap/stack buffer overflow in the dlang_lname function in d-demangle.c in libiberty allows attackers to potentially cause a denial of ser…

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   R  U  N  N  H    6.5   .0141   72.2     —

AFFECTED
  Product  Versions      Fixed
  gcc      gcc 11.2.0 –  —

TIMELINE
  Sep 23  Reserved by redhat
  Sep 1   Published (CNA: redhat)
  Oct 14  ENRICHED — CVE-2021-3826 (gcc). Received CVSS 6.5 and CPE data from NVD.

CWE-119, CWE-787 · CNA: redhat · CVSS v3.1 · 8 references · NVD status: Modified

Description

Heap/stack buffer overflow in the dlang_lname function in d-demangle.c in libiberty allows attackers to potentially cause a denial of service (segmentation fault and crash) via a crafted mangled symbol.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
September 23, 2021	Reserved	Reserved by redhat
September 1, 2022	Published	Published (CNA: redhat)
October 14, 2026	ENRICHED	ENRICHED — CVE-2021-3826 (gcc). Received CVSS 6.5 and CPE data from NVD.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
n/a	gcc	—	gcc 11.2.0	—

Weaknesses

CWE-119 · CWE-787

References (8)

https://cert-portal.siemens.com/productcert/html/ssa-398330.html
https://gcc.gnu.org/git/?p=gcc.git%3Ba=commit%3Bh=5481040197402be6dfee265bd2ff5a4c88e30505 [Broken Link]
https://gcc.gnu.org/pipermail/gcc-patches/2021-September/579987 [Mailing List, Patch, Vendor Advisory]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4MYLS3VR4OPL5ECRWOR4ZHMGXUSCJFZY/ [Mailing List, Third Party Advisory]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6AKZ2DTS3ATVN5PANNVLKLE5OP4OF25Q/ [Mailing List, Third Party Advisory]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7MTEHT3G6YKJ7F7MSGWYSI4UM3XBAYXZ/ [Mailing List, Third Party Advisory]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AXFC74WRZ2Q7F2TSUKPYNIL7ZPBWYI6L/ [Mailing List, Third Party Advisory]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/H424YXGW7OKXS2NCAP35OP6Y4P4AW6VG/ [Mailing List, Third Party Advisory]

Authoritative record: CVE-2021-3826 at cve.org

Weaknesses: CWE-119 · CWE-787

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-3826 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.