CVE-2021-26951: An issue was discovered in the calamine crate before 0.17.0 for Rust

Q: How do I fix CVE-2021-26951?

calamine: upgrade to 0.17.0. Exact commands for each OS are on this page.

Q: Is CVE-2021-26951 being exploited?

CVE-2021-26951 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-26951 affect?

CVE-2021-26951 affects calamine. Severity is critical (CVSS 9.8). An issue was discovered in the calamine crate before 0.17.0 for Rust. It allows attackers to overwrite heap-memory locations because Vec::set_len is used without proper memory claiming, and this uninitialized memory is used for a user-provi

Q: How urgent is CVE-2021-26951?

Priority 64/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2021-26951 is a critical-severity flaw (CVSS 9.8) affecting calamine. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in the calamine crate before 0.17.0 for Rust. It allows attackers to overwrite heap-memory locations because Vec::set_len is used without proper memory claiming, and this uninitialized memory is used for a user-provided Read operation, as demonstrated by Sectors::get.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.7% (top 22%)
CISA exploited list	No
Weakness	CWE-787, CWE-908
Published	2021-02-09
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: calamine project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-02-09 23:15 UTCPublished CVE record published
2026-06-17 03:44 UTCUpdated Record last modified

calamine project calamine UPGRADE

Affected: < 0.17.0

Fixed in: 0.17.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy calamine || rpm -q calamine || calamine --version

2. UPGRADE to 0.17.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade calamine

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade calamine

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-26951?

calamine: upgrade to 0.17.0. Exact commands for each OS are on this page.

Is CVE-2021-26951 being exploited?

CVE-2021-26951 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-26951 affect?

CVE-2021-26951 affects calamine. Severity is critical (CVSS 9.8). An issue was discovered in the calamine crate before 0.17.0 for Rust. It allows attackers to overwrite heap-memory locations because Vec::set_len is used without proper memory claiming, and this uninitialized memory is used for a user-provi

How urgent is CVE-2021-26951?

Priority 64/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

References

← Back to latest CVEs