# CVE-2026-76987: liftoff-sr CIPster memory corruption in attribute handling

Source: https://junglewise.ai/threats/cve-2026-76987-liftoff-sr-cipster-memory-corruption-in-attribute-handling  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-20. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-76987 · Severity: high · CVSS 7.3 · Published 2026-08-20

CIPster is an Ethernet/IP protocol stack used in industrial I/O adapter devices. A memory corruption vulnerability in the attribute handling logic allows a remote attacker to read arbitrary memory or write out of bounds, potentially compromising device availability and control.

## Quick answers

**Is CVE-2026-76987 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-76987 being exploited in the wild.

**How severe is CVE-2026-76987?** High severity, with a CVSS score of 7.3, published 20 August 2026.

**Which products and versions are affected?** liftoff-sr CIPster before commit e745d9d4a8ca3a13689066983a1269fe1e567674.

**Is there a fix for CVE-2026-76987?** A patch was published on 2026-06-01: Patch commit e745d9d4a8ca3a13689066983a1269fe1e567674 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-76987 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-76987?** Check whether anything you run is named in the advisory. 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 vulnerability is a buffer overflow in the CipAttribute::GetAttrData and CipAttribute::SetAttrData functions (ciptypes.h). The root cause is insufficient bounds checking on byte-array attribute length: a remote attacker can send a SetAttributeSingle message with an attacker-controlled length value that is not validated against the actual buffer capacity. This allows out-of-bounds reads (information disclosure) and out-of-bounds writes (memory corruption). The attack is network-reachable and requires no authentication. The patch (commit e745d9d4a8ca3a13689066983a1269fe1e567674) introduces a CipByteArray type that tracks capacity immutably, preventing length inflation past the allocation.

## Affected products

- liftoff-sr CIPster before commit e745d9d4a8ca3a13689066983a1269fe1e567674

## Timeline

- 2026-08-20: disclosed
- 2026-06-01: patched: Patch commit e745d9d4a8ca3a13689066983a1269fe1e567674

## References

- [https://github.com/liftoff-sr/CIPster/](https://github.com/liftoff-sr/CIPster/)
- [https://github.com/liftoff-sr/CIPster/commit/e745d9d4a8ca3a13689066983a1269fe1e567674](https://github.com/liftoff-sr/CIPster/commit/e745d9d4a8ca3a13689066983a1269fe1e567674)