# CVE-2026-75892: osmo-ggsn out-of-bounds write in PDP context GSN-Address decode

Source: https://junglewise.ai/threats/cve-2026-75892-in-osmo-ggsn-1-14-0-an-out-of-bounds-write-issue-was-found-in-the  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-18. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-75892 · Severity: medium · CVSS 6.5 · Published 2026-09-18

osmo-ggsn is a GPRS gateway node that routes mobile data traffic between cellular networks and the internet. A memory corruption flaw in PDP context processing allows a malicious peer network node to crash the gateway or potentially execute code by sending specially crafted network messages.

Vendors: [Osmocom](https://junglewise.ai/threats/vendors/osmocom).

## Quick answers

**Is CVE-2026-75892 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-75892 being exploited in the wild.

**How severe is CVE-2026-75892?** Medium severity, with a CVSS score of 6.5, published 18 September 2026.

**Which products and versions are affected?** Osmocom Osmo-Ggsn 1.14.0; Osmocom Osmo-Sgsn <UNKNOWN>.

**Is there a fix for CVE-2026-75892?** A patch was published on 2026-08-12: Fix committed to osmo-ggsn repository Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-75892 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-75892?** Check whether you run Osmocom Osmo-Ggsn or Osmocom Osmo-Sgsn at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The gtp_decode_pdp_ctx() function in osmo-ggsn and osmo-sgsn's libgtp library fails to validate GSN-Address sub-field lengths against the 16-byte destination buffer before performing memcpy(), allowing lengths up to 255 bytes from the wire to overflow the fixed array. The vulnerability is exploitable over the Gn/Gp interface by a malicious or spoofed peer GSN through SGSN Context Response or Forward Relocation messages. A fix validating lengths against destination capacity is available.

## Affected products

- osmocom osmo-ggsn 1.14.0
- osmocom osmo-sgsn <UNKNOWN>

## Timeline

- 2026-09-18: disclosed
- 2026-08-12: patched: Fix committed to osmo-ggsn repository

## References

- [https://cgit.osmocom.org/osmo-ggsn/commit/?id=6c322f4dd339401a437da3c89c95f2bf64bca995](https://cgit.osmocom.org/osmo-ggsn/commit/?id=6c322f4dd339401a437da3c89c95f2bf64bca995)