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High, CVSS 8.7amended

PostQuantum-Feldman-VSS'S Dependency Vulnerability in gmpy2 Leading to Interpreter Crash

GHSA-v432-7f47-9g94

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (postquantum-feldman-vss 0.7.7b0), 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.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
8.7 · 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 · score source
EPSS
No dated EPSS signal available.
Source description

As published by the source; long descriptions are shortened.

Description: PostQuantum-Feldman-VSS, a Python library implementing Feldman's Verifiable Secret Sharing scheme with post-quantum security, was vulnerable to denial-of-service attacks in versions up to and including 0.7.6b0. This vulnerability stems from the library's reliance on the gmpy2 library for arbitrary-precision arithmetic. gmpy2, in turn, depends on the GNU Multiple Precision Arithmetic Library (GMP). GMP, by design, terminates the process when it cannot allocate memory. An attacker could exploit this by providing carefully crafted inputs that cause gmpy2 to attempt to allocate extremely large amounts of memory, leading to a crash of the Python interpreter and thus a denial of service. Vulnerability Details: The core issue lies in the behavior of GMP (and thus, gmpy2) when memory allocation fails. Instead of raising a standard Python exception that could be caught and handled, GMP terminates the entire process. This behavior is documented in the GMP and gmpy2 documentation:…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 3 · amended ·

    Amended from ghsa record GHSA-v432-7f47-9g94

  2. Revision 2 · amended ·

    Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

  3. Revision 1 · created ·

    Published from osv record GHSA-v432-7f47-9g94

Agent brief

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# Patch Next advisory brief: GHSA-v432-7f47-9g94

Advisory: PostQuantum-Feldman-VSS'S Dependency Vulnerability in gmpy2 Leading to Interpreter Crash
IDs: GHSA-v432-7f47-9g94
Record: https://patchnext.com/advisories/ghsa-v432-7f47-9g94 (revision 3, source checked 26 Oct 2026, 13:31 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.7)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: postquantum-feldman-vss 0.7.7b0. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI postquantum-feldman-vss: affected <= 0.7.6b0; fixed in 0.7.7b0

## Suggested inspection (read-only)
- `python -m pip show postquantum-feldman-vss`: prints the installed version. Run with the environment that serves production active.

## 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 postquantum-feldman-vss.
- 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://osv.dev/vulnerability/GHSA-v432-7f47-9g94 (OSV record GHSA-v432-7f47-9g94 lists affected ranges: PyPI postquantum-feldman-vss >=0 <0.7.7b0 (fixed))
- Verified: https://github.com/advisories/GHSA-v432-7f47-9g94 (GitHub-reviewed advisory GHSA-v432-7f47-9g94 lists affected ranges: PyPI postquantum-feldman-vss >=0 <=0.7.6b0)

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