Vulnerability · CVE-2021-3826
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 c…
Published Sep 1, 2022 · catalog updated Oct 14, 2026 · the affected product
Check if you run it
No confirmed exploitation is on record for CVE-2021-3826. EPSS is 1.41%. Act only if a listed version of the affected product is installed.
Gaps on this record
- No plain product name is stored. The page cannot tell you which product to check.
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
- Severity
- Medium6.5
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 1.41%
- Remediation
- Advisory link
- Affected products
- cpe fedoraproject/fedora · cpe gnu/gcc
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.
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- cpe fedoraproject/fedora35
- cpe fedoraproject/fedora36
- cpe fedoraproject/fedora37
- cpe gnu/gcc11.2
How to fix CVE-2021-3826
Recommended remediation
A patch or advisory reference is linked. Open the original publisher for availability by product version.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2021-3826. EPSS is 1.41%. Act only if a listed version of the affected product is installed.
Which versions are affected?
Compare what you have installed with 35, 36, 37, 11.2. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-119: Buffer Overflow; CWE-787: Out-of-bounds Write. EPSS 1.41%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Sep 1, 2022 · NIST NVD
Detected
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.
Oct 14, 2026 · NIST NVD
Updated
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.
Sources
- CVE.orgVulnerability recordCVE-2021-3826
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2021-3826
30-day exploitation probability 1.4%
first.org - NIST NVDVulnerability recordCVE-2021-3826
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.
nvd.nist.gov
References
Freshness
Last verified in this catalog Oct 16, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.