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mail-internals use-after-free vulnerability in vec_insert_bytes

GHSA-rcx8-48pc-v9q8

What to do

Vendor response not established. Follow the primary source's mitigation guidance and check back for a fix.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • crates.io mail-internals

    Affected
    >= 0.2.0, <= 0.2.3
    Fixed in
    no fixed version recorded

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
not scored
EPSS
No dated EPSS signal available.
Source description

As published by the source; long descriptions are shortened.

Incorrect reallocation logic in the function vecinsertbytes causes a use-after-free. This function does not have to be called directly to trigger the vulnerability because many methods on EncodingWriter call this function internally. The mail-\ suite is unmaintained and the upstream sources have been actively vandalised. A fixed mail-internals-ng (and mail-headers-ng and mail-core-ng) crate has been published which fixes this, and a dependency on another unsound crate.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-rcx8-48pc-v9q8

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: GHSA-rcx8-48pc-v9q8

Advisory: mail-internals use-after-free vulnerability in `vec_insert_bytes`
IDs: GHSA-rcx8-48pc-v9q8
Record: https://patchnext.com/advisories/ghsa-rcx8-48pc-v9q8 (revision 1, source checked 26 Oct 2026, 15:37 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Unrated
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- crates.io mail-internals: affected >= 0.2.0, <= 0.2.3

## Suggested inspection (read-only)
- crates.io mail-internals: check the installed version with your package manager.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on mail-internals.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-rcx8-48pc-v9q8 (GitHub-reviewed advisory GHSA-rcx8-48pc-v9q8 lists affected ranges: crates.io mail-internals >=0.2.0 <=0.2.3)

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