GHSA-7587-4wv6-m68m: Pgp RPGP Vulnerable To Parser Crash Vulnerability

HIGH
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CWE-703
Published
Advisory Summary

GHSA-7587-4wv6-m68m is a HIGH rpgp vulnerable to parser crash vulnerability (CWE-703: Improper Check or Handling of Exceptional Conditions) affecting Pgp libraries in the crates.io ecosystem. The issue involves rpgp vulnerable to parser crash on crafted rsa secret key packets through cve-2026-21895. Remediation is available by upgrading affected packages to version 0.19.0.

GHSA-7587-4wv6-m68m at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-7587-4wv6-m68m
Severity HIGH
CVSS v3.1 Base Score N/A
CWE Classification CWE-703: Improper Check or Handling of Exceptional Conditions
Affected Product Pgp
Package Ecosystem crates.io
Published Date
Last Updated

How to Fix GHSA-7587-4wv6-m68m

To remediate this vulnerability, upgrade all affected Pgp dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

pgp fixed: 0.19.0 
Upgrade pgp to 0.19.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for pgp

How to Check if You Are Affected

To determine whether your application is affected by GHSA-7587-4wv6-m68m, inspect your project dependencies for Pgp:

inspect dependencies for pgp

Analyze the terminal output to locate any version of Pgp in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.19.0), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-703: Improper Check or Handling of Exceptional Conditions, where the product does not properly anticipate or handle exceptional conditions that rarely occur during normal operation of the product. In Pgp, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Summary It was possible to trigger an unhandled edge case in the Rust Crypto rsa crate through rPGP packet parsing functionality, and crash the process that runs rPGP. This problem has been patched in a new rsa version. The new release of rPGP ensures a patched version of the rsa crate is in use, which prevents this issue. ### Details While parsing a special RSA secret key packet, rPGP calls the rsa crate with the provided key. On vulnerable versions, this results in a Rust "panic" during key construction. Note that an attacker can trigger this situation even in places where applications don't expect to handle foreign key material, for example while attempting to receive a message. For more information on the rsa crate vulnerability, see https://github.com/RustCrypto/RSA/security/advisories/GHSA-9c48-w39g-hm26 and https://github.com/RustCrypto/RSA/pull/624. In rPGP, this has been fixed via https://github.com/rpgp/rpgp/pull/698. ### Impact This issue impacts availability (i.e. applications can crash). Affected rPGP versions: rPGP 0.16.0-alpha.0 to 0.18.0 Vulnerable rsa versions: all before version 0.9.10 ### Workaround The issue depends on the combination of affected rPGP and rsa versions. Users of affected rPGP versions can pin the patched rsa 0.9.10 via a cargo lockfile to mitigate the issue. ### Attribution Discovered by Christian Reitter from Radically Open Security during a security review for Proton AG.

GHSA-7587-4wv6-m68m Affected Pgp Versions

1 component(s)
Fixed Versions:
0.19.0
Product / Package Ecosystem Affected Versions Fixed Version
pgp
 crates.io
≥ 0.16.0-alpha.0
< 0.19.0
0.19.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/rpgp/rpgp/security/advisories/GHSA-7587-4wv6-m68m
Pgp Source Repository REPOSITORY
https://github.com/rpgp/rpgp/pull/698
Security Fix Commit FIX COMMIT
https://github.com/rpgp/rpgp/commit/38efa49ce18b3821649de9cd8dea88a959b833a5
Pgp Source Repository REPOSITORY
https://github.com/rpgp/rpgp

Frequently Asked Questions

What is GHSA-7587-4wv6-m68m?
GHSA-7587-4wv6-m68m is a security vulnerability in Pgp involving rPGP vulnerable to parser crash on crafted RSA secret key packets through CVE-2026-21895 under CWE-703: Improper Check or Handling of Exceptional Conditions.
Which Pgp versions are affected?
Affected versions include releases prior to 0.19.0 across affected packages: pgp.
What version fixes GHSA-7587-4wv6-m68m?
Upgrading to 0.19.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is pgp affected?
Yes, pgp is affected in releases prior to 0.19.0. Upgrade your dependency to 0.19.0 or later.
What CWE is associated with GHSA-7587-4wv6-m68m?
GHSA-7587-4wv6-m68m is classified under CWE-703: Improper Check or Handling of Exceptional Conditions (The product does not properly anticipate or handle exceptional conditions that rarely occur during normal operation of the product.).
How can I check crates.io dependencies for GHSA-7587-4wv6-m68m?
Run the dependency tree command: 'inspect dependencies for pgp'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-7587-4wv6-m68m",
  "modified" : "2026-02-13T20:54:19Z",
  "published" : "2026-02-13T20:54:19Z",
  "aliases" : [ ],
  "summary" : "rPGP vulnerable to parser crash on crafted RSA secret key packets through CVE-2026-21895",
  "details" : "### Summary\nIt was possible to trigger an unhandled edge case in the Rust Crypto rsa crate through rPGP packet parsing functionality, and crash the process that runs rPGP. This problem has been patched in a new rsa version. The new release of rPGP ensures a patched version of the rsa crate is in use, which prevents this issue.\n\n### Details\nWhile parsing a special RSA secret key packet, rPGP calls the rsa crate with the provided key. On vulnerable versions, this results in a Rust \"panic\" during key construction. Note that an attacker can trigger this situation even in places where applications don't expect to handle foreign key material, for example while attempting to receive a message.\n\nFor more information on the rsa crate vulnerability, see https://github.com/RustCrypto/RSA/security/advisories/GHSA-9c48-w39g-hm26 and https://github.com/RustCrypto/RSA/pull/624.\nIn rPGP, this has been fixed via https://github.com/rpgp/rpgp/pull/698.\n\n### Impact\nThis issue impacts availability (i.e. applications can crash).\n\nAffected rPGP versions: rPGP 0.16.0-alpha.0 to 0.18.0\nVulnerable rsa versions: all before version 0.9.10\n\n### Workaround\nThe issue depends on the combination of affected rPGP and rsa versions. Users of affected rPGP versions can pin the patched rsa 0.9.10 via a cargo lockfile to mitigate the issue.\n\n### Attribution\nDiscovered by Christian Reitter from Radically Open Security during a security review for Proton AG.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "pgp"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0.16.0-alpha.0"
      }, {
        "fixed" : "0.19.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/rpgp/rpgp/security/advisories/GHSA-7587-4wv6-m68m"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rpgp/rpgp/pull/698"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rpgp/rpgp/commit/38efa49ce18b3821649de9cd8dea88a959b833a5"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/rpgp/rpgp"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-703" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-02-13T20:54:19Z",
    "nvd_published_at" : null
  }
}