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MEDIUM

CVE-2021-28876

CVSS v3

5.3

MEDIUM

EPSS Score

1.6 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • CVE-2021-28876 Red Hat Product Security121 products fixed

    rust: panic safety issue in Zip implementation

  • RHSA-2021:3063 Red Hat Product Security67 products fixed

    Red Hat Security Advisory: rust-toolset:rhel8 security, bug fix, and enhancement update

  • RHSA-2021:3042 Red Hat Product Security54 products fixed

    Red Hat Security Advisory: rust-toolset-1.52 and rust-toolset-1.52-rust security and enhancement update

Full record on NVD

Description

In the standard library in Rust before 1.52.0, the Zip implementation has a panic safety issue. It calls __iterator_get_unchecked() more than once for the same index when the underlying iterator panics (in certain conditions). This bug could lead to a memory safety violation due to an unmet safety requirement for the TrustedRandomAccess trait.

Technical details

Published
2021-04-11

Frequently asked questions

What is CVE-2021-28876?

In the standard library in Rust before 1.52.0, the Zip implementation has a panic safety issue. It calls __iterator_get_unchecked() more than once for the same index when the underlying iterator panics (in certain conditions). This bug could lead to a memory safety violation due to an unmet safety requirement for the TrustedRandomAccess trait.

Is CVE-2021-28876 actively exploited?

Active exploitation of CVE-2021-28876 has not been confirmed. Its EPSS score was 1.6% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-28876?

CVE-2021-28876 has a CVSS v3 base score of 5.3 (MEDIUM severity).

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