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CVE-2021-26951

31
FAUCET Score

CVE-2021-26951 is a critical heap-memory overwrite vulnerability affecting the calamine crate for Rust, specifically versions prior to 0.17.0. This flaw, rated 9.8 CVSS, allows unauthenticated remote attackers to execute arbitrary code or cause denial of service due to improper memory handling during Read operations. While there is no known active exploitation or public exploit code, the vulnerability has garnered significant community discussion, indicating potential interest from threat actors.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.17.0CPE matchmatch criteria
cpe:2.3:a:calamine_project:calamine:*:*:*:*:*:rust:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.73%
Probability of exploitation in next 30 days
EPSS Percentile
75.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0173 is in the 63rd percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

rustpatch availablevia ghsa
Product: calamineFixed in: 0.17.0

Vendor Advisories (1)

rustGHSA-ppqp-78xx-3r38critical

Out of bounds write in calamine

Aug 25, 2021

References

rustsec.org / advisories/RUSTSEC-2021-0015.html
ExploitVendor Advisory