Skip to content
Patch Next
Sign inAdd to your agent

← Actionable
Unrated

Panic on incorrect date input to simple_asn1

GHSA-3m6f-3gfg-4x56

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (simple_asn1 0.6.1), redeploy, then verify what is actually installed.

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.

Add to your agent

Affected packages

  • crates.io simple_asn1

    Affected
    >= 0.6.0, <= 0.6.0
    Fixed in
    0.6.1

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.

Version 0.6.0 of the simpleasn1 crate panics on certain malformed inputs to its parsing functions, including fromder and derdecode. Because this crate is frequently used with inputs from the network, this should be considered a security vulnerability. The issue occurs when parsing the old ASN.1 "UTCTime" time format. If an attacker provides a UTCTime where the first character is ASCII but the second character is above 0x7f, a string slice operation in the fromder function will try to slice into the middle of a UTF-8 character, and cause a panic. This error was introduced in commit d7d39d709577710e9dc8, which updated simpleasn1 to use time instead of chrono because of RUSTSEC-2020-159. Versions of simpleasn1 before 0.6.0 are not affected by this issue. The patch was applied in simpleasn1 version 0.6.1.

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

    Published from ghsa record GHSA-3m6f-3gfg-4x56

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-3m6f-3gfg-4x56

Advisory: Panic on incorrect date input to `simple_asn1`
IDs: GHSA-3m6f-3gfg-4x56
Record: https://patchnext.com/advisories/ghsa-3m6f-3gfg-4x56 (revision 1, source checked 26 Oct 2026, 15:34 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 fix available; fixed versions by package: simple_asn1 0.6.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- crates.io simple_asn1: affected >= 0.6.0, <= 0.6.0; fixed in 0.6.1

## Suggested inspection (read-only)
- crates.io simple_asn1: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on simple_asn1.
- 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-3m6f-3gfg-4x56 (GitHub-reviewed advisory GHSA-3m6f-3gfg-4x56 lists affected ranges: crates.io simple_asn1 >=0.6.0 <=0.6.0)

Commands are suggestions: review each one before running it.

Loading voting…