CVE-2026-123975
Grid Community Toolkit globus-gss-assist before 12.9 Pre-Authentication Heap Out-of-Bounds Write
Grid Community Toolkit before 6.2.20261111 (globus-gss-assist before 12.9) contains a heap out-of-bounds write in globus_gss_assist_token_get_fd() triggered by SSLv2 record lengths below 3. Remote unauthenticated clients can send a crafted GSI handshake record to services like globus-gatekeeper and myproxy to corrupt heap memory and crash the service.
Fixes and workarounds
Fix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: VulnCheckAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| Grid Community Toolkit Grid Community Forum gridcf/gct
github |
≥ 0; < 6.2.20261111 (affected, custom)
Other versions: unaffected |
CNA: VulnCheck |
| globus-gss-assist Grid Community Forum gridcf/gct
github |
≥ 0; < 12.9 (affected, custom)
Other versions: unaffected |
CNA: VulnCheck |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 8.7 high |
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 | CNA: VulnCheck |
| 3.1 / 7.5 high |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | CNA: VulnCheck |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://gridcf.org/#2026-11-11CNA: VulnCheck · vendor-advisory
- https://github.com/gridcf/gct/commit/3df2be4834c146bdcec90009a0f2e5771ff63ccaCNA: VulnCheck · patch
- https://github.com/gridcf/gct/releases/tag/v6.2.20261111CNA: VulnCheck · release-notes
- https://github.com/gridcf/gct/blob/v6.2.20190829/gsi/gss_assist/source/tokens_f.cCNA: VulnCheck · technical-description
- https://www.vulncheck.com/advisories/grid-community-toolkit-globus-gss-assist-before-12.9-pre-authentication-heap-out-of-bounds-writeCNA: VulnCheck · third-party-advisory
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