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Not in CISA KEV
HIGH severity

CVE-2023-1521 — sccache

HIGH

CVE-2023-1521 is a high-severity (CVSS 7.8) CWE-426 vulnerability in sccache. A fix is available for sccache — see the affected versions and patch details below.

sccache vulnerable to privilege escalation if server is run as root

Also known asGHSA-x7fr-pg8f-93f5
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 7, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • A successful exploit gives an attacker total control of the affected component, not partial access.
  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2023-1521.

EPSS Exploitation Probability

via FIRST.org ↗
0.4%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs30th percentile — riskier than 30% of all scored CVEsHighest risk
0.00%0.29%0.58%0.86%0.3%0.4%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🦀sccache

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects crates.io packages — download data is not available via public APIs for these ecosystems.

Description

Impact

On Linux the sccache client can execute arbitrary code with the privileges of a local sccache server, by preloading the code in a shared library passed to LD_PRELOAD.

If the server is run as root (which is the default when installing the snap package), this means a user running the sccache client can get root privileges.

Patches

Upgrade to 0.4.0

Workarounds

Don't run sccache server as root.

GitHub Security Lab number

GHSL-2023-046

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🦀crates.iosccacheall versions0.4.0cargo update -p sccache --precise 0.4.0

Affected Products

1 product · 1 configurations
Application
sccachemozilla
< 0.4.0
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for sccache, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update sccache to 0.4.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2023-1521 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

### Impact On Linux the `sccache` client can execute arbitrary code with the privileges of a local `sccache` server, by preloading the code in a shared library passed to `LD_PRELOAD`. If the server is run as root (which is the default when installing the [snap package](https://snapcraft.io/sccache)), this means a user running the `sccache` client can get root privileges. ### Patches Upgrade to 0.4.0 ### Workarounds Don't run sccache server as root. ### GitHub Security Lab number GHSL-2023-046
O3 Security · Impact-Aware SCA

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CVE-2023-1521: sccache RCE — Fixed in 0.4.0