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CVE Record

CVE-2026-24882: In GnuPG before 2.5.17, a stack-based buffer overflow exists in tpm2daemon during handling of the PKDECRYPT...

In GnuPG before 2.5.17, a stack-based buffer overflow exists in tpm2daemon during handling of the PKDECRYPT command for TPM-backed RSA and ECC keys.

HighCVSS 8.4Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2026-24882 is a high-severity memory corruption flaw in GnuPG's tpm2daemon. It affects handling of decryption requests for TPM-backed RSA and ECC keys in GnuPG before 2.5.17. Organizations using TPM-backed GnuPG keys should treat this as urgent because successful exploitation could compromise confidentiality, integrity, and availability on the local system.

Executive priority

Prioritize remediation for systems using TPM-backed GnuPG keys, especially developer, signing, automation, or administrative hosts. The issue is local rather than remotely network-exposed, but the impact rating supports prompt patching in environments where GnuPG protects sensitive keys or trusted workflows.

Technical view

The flaw is a stack-based buffer overflow, CWE-121, in tpm2daemon while processing the PKDECRYPT command for TPM-backed RSA and ECC keys. The CVSS 3.1 score is 8.4 with local attack vector, low complexity, no privileges, no user interaction, unchanged scope, and high confidentiality, integrity, and availability impact.

Likely exposure

Exposure is most likely on systems running GnuPG before 2.5.17 where tpm2daemon is present and TPM-backed RSA or ECC keys are used. The source bundle's affected-product data is incomplete or inconsistent, so validate exposure against installed packages and vendor advisories.

Exploitation context

The provided data does not show CISA KEV listing or cited evidence of active exploitation. The vulnerability is locally reachable according to CVSS, but the stated impact is severe because memory corruption in tpm2daemon could affect protected key operations.

Researcher notes

Key unknowns remain in the supplied data: exploitability details, exact downstream affected package ranges, and practical preconditions are not fully described. The strongest source-grounded boundary is GnuPG before 2.5.17, tpm2daemon, PKDECRYPT, and TPM-backed RSA/ECC keys. Do not assume active exploitation without new evidence.

Mitigation direction

  • Update GnuPG to 2.5.17 or a vendor-fixed package where available.
  • Apply relevant Red Hat advisories if using affected Red Hat packages.
  • Review GnuPG T8045 and vendor guidance for environment-specific handling.
  • Limit use of TPM-backed GnuPG keys until fixed where operationally feasible.
  • Prioritize systems using TPM-backed RSA or ECC keys.

Validation and detection

  • Inventory GnuPG versions and package sources across endpoints and servers.
  • Check whether tpm2daemon is installed, enabled, or reachable locally.
  • Identify systems using TPM-backed RSA or ECC GnuPG keys.
  • Confirm fixed package status against Red Hat errata or upstream GnuPG guidance.
  • Review endpoint telemetry for unusual local tpm2daemon crashes or failures.
Prepared
Confidence
medium
Sources
9

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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 · low confidence lookup

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 lookup
cve · low confidence lookup

CVE-2026-24882 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
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

Official CVE source material

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.

2CVSS vectors
5Timeline events
2ADP providers
8Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: total

CVSS vector scores

2 official scores

We 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.

ScoreVersionSeverityVectorExploitImpactSource
8.4CVSS 3.1HighCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H2.55.9mitre
8.4CVSS 3.1HighCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H2.55.9redhat-SADP

Vulnerability scoring details

Base CVSS 3.1 score

8.4High
CVSS 3.1 vector shape for CVE-2026-24882Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. ADP timelineredhat-SADP

    Made public.

  3. CVE publishedCVE Program

    The CVE record was published.

  4. ADP timelineredhat-SADP

    Reported to Red Hat.

  5. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc
redhat-SADPGnuPG: GnuPG: Stack-based buffer overflow in tpm2daemon allows arbitrary code execution
other:Red Hat severity ratingcvssV3_1
  • 2026-01-27T19:00:57.683Z: Reported to Red Hat.
  • 2026-01-27T18:40:18.166Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
GnuPGGnuPG0unaffected
Weakness

CWE details

CWE-121

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-121 · source CWE mapping

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.

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