Security readout for executives and security teams
Plain-English summary
GnuPG before 2.5.17 has a high-impact memory safety flaw in tpm2daemon. The issue is tied to decryption operations using TPM-backed RSA or ECC keys. A successful local attack could compromise confidentiality, integrity, and availability on affected systems.
Executive priority
Treat as high priority for systems using GnuPG TPM-backed keys. Patch promptly, especially on shared workstations, servers with local user access, or environments where key confidentiality is business-critical.
Technical view
CVE-2026-24882 is a CWE-121 stack-based buffer overflow in GnuPG tpm2daemon while handling the PKDECRYPT command for TPM-backed RSA and ECC keys. CVSS 3.1 is 8.4 with local attack vector, low complexity, no privileges, no user interaction, and high CIA impact.
Likely exposure
Exposure is most likely where GnuPG before 2.5.17 is installed and TPM-backed RSA or ECC keys are used through tpm2daemon. The source bundle does not identify other affected products or remote exposure.
Exploitation context
The CVE is not listed as KEV, and the provided sources do not state active exploitation. The CVSS vector indicates local exploitation with no privileges or user interaction required, but the bundle does not provide exploit maturity details.
Researcher notes
The strongest details are the CVE description, CVSS vector, CWE, and fixed-before version boundary. The bundle does not include proof-of-concept details, exploit status, or deeper root-cause analysis beyond PKDECRYPT handling in tpm2daemon.
Mitigation direction
- Upgrade GnuPG to version 2.5.17 or later.
- Apply relevant vendor updates, including listed Red Hat advisories where applicable.
- Prioritize systems using TPM-backed RSA or ECC keys.
- Check vendor guidance if package status differs by distribution.
Validation and detection
- Inventory installed GnuPG versions across endpoints and servers.
- Identify hosts using tpm2daemon with TPM-backed RSA or ECC keys.
- Confirm vendor packages include the CVE fix.
- Review local-user access on affected hosts until updated.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-121: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-24882 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 8.4 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
2 official scoresWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H2.55.9mitreCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H2.55.9redhat-SADPVulnerability scoring details
Base CVSS 3.1 score
8.4HighVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Base CVSS 3.1 score
8.4HighVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- ADP timelineredhat-SADP
Made public.
- CVE publishedCVE Program
The CVE record was published.
- ADP timelineredhat-SADP
Reported to Red Hat.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
- 2026-01-27T19:00:57.683Z: Reported to Red Hat.
- 2026-01-27T18:40:18.166Z: Made public.
Source materials
- CVE List V5 sourceCVE List V5
- https://www.openwall.com/lists/oss-security/2026/01/27/8CVE reference, mitre
- https://dev.gnupg.org/T8045CVE reference, mitre
- https://access.redhat.com/security/cve/CVE-2026-24882CVE reference, redhat-SADP · vdb-entry, x_refsource_REDHAT
- RHBZ#2433464CVE reference, redhat-SADP · issue-tracking, x_refsource_REDHAT
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-24882.jsonCVE reference, redhat-SADP · x_sadp-csaf-vex
- https://access.redhat.com/errata/RHSA-2026:2753CVE reference, redhat-SADP · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:2719CVE reference, redhat-SADP · vendor-advisory, x_refsource_REDHAT
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Stack-based Buffer Overflow
Stack-based Buffer Overflow represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.