HighPublic exploit

Stack-based Buffer Overflow in GnuPG tpm2daemon PKDECRYPT

IdentifiersCVE-2026-24882CWE-121· Stack-based Buffer Overflow

CVE-2026-24882 is a stack-based buffer overflow in GnuPG before version 2.5.17 affecting tpm2daemon, the helper process used for cryptographic operations with TPM-backed private keys. The flaw occurs during handling of the PKDECRYPT command for TPM-backed RSA and ECC keys. During a PKDECRYPT request, attacker-controlled ciphertext is copied into fixed-size TPM work buffers without proper length validation. If the supplied ciphertext exceeds the expected buffer size, the copy operation writes past the end of a stack buffer and corrupts adjacent stack memory. The vulnerable condition affects both TPM decrypt paths, including RSA and ECC handling, and can lead to process crash or potentially code execution within the tpm2daemon process.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation can corrupt stack memory in tpm2daemon, causing denial of service through process termination and potentially enabling arbitrary code execution in the context of the tpm2daemon process. Because the vulnerable component services TPM-backed key operations, exploitation may undermine the integrity of local cryptographic operations and could provide an attacker with a foothold in the security-sensitive helper process.

Mitigation

If you can’t patch tonight, do this now.

If immediate patching is not possible, reduce exposure by avoiding or disabling use of TPM-backed RSA and ECC keys where feasible, and restrict access to the local IPC interface used to communicate with tpm2daemon so that only trusted local users and processes can invoke PKDECRYPT-related functionality. Additional OS-level hardening and least-privilege controls should be applied to limit access to the helper process.

Remediation

Patch, then assume compromise.

Upgrade GnuPG to version 2.5.17 or later, which addresses the improper bounds handling in tpm2daemon PKDECRYPT processing for TPM-backed RSA and ECC keys.

PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType

GnupgGnupgapplication

Gpg4winGpg4winapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

18 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

18 SOURCESView more in app

the hacker newsNews

Mar 7, 2026

OpenAI Codex Security Scanned 1.2 Million Commits and Found 10,561 High-Severity Issues

Unknown

the hacker newsNews

Mar 7, 2026

OpenAI Codex Security Scanned 1.2 Million Commits and Found 10,561 High-Severity Issues

Unknown

What this page doesn’t show

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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity16