NASA JPL ION-DTN up to 4.2.0 Convergence Layer dgr_receive svcDataLength integer overflow

Summaryinfo

A vulnerability classified as very critical has been found in NASA JPL ION-DTN up to 4.2.0. Impacted is the function dgr_receive of the component Convergence Layer. The manipulation of the argument svcDataLength leads to integer overflow. This vulnerability is traded as CVE-2026-124001. It is possible to initiate the attack remotely. There is no exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in NASA JPL ION-DTN up to 4.2.0 and classified as very critical. This issue affects the function dgr_receive of the component Convergence Layer. The manipulation of the argument svcDataLength with an unknown input leads to a integer overflow vulnerability. Using CWE to declare the problem leads to CWE-190. The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

NASA JPL ION-DTN 2.2.1b through 4.2.0 contains an integer overflow vulnerability in the Datagram Retransmission (DGR) convergence layer that allows attackers to corrupt heap memory by sending a maliciously crafted 64-bit svcDataLength value that wraps a 32-bit allocation size calculation. Attackers can exploit the dgr_receive API's unchecked memcpy operation using synthetic datagrams or DGR traffic over internal IPC or custom transports to trigger an out-of-bounds write, leading to denial of service or potential remote code execution.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-124001 since 11/06/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 11/09/2026).

Upgrading to version 4.2.1-a.2 eliminates this vulnerability.

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Productinfo

Vendor

• NASA JPL

Name

• ION-DTN

Version

• 4.0
• 4.1
• 4.2.0

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CPE 2.2info

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