| Title | Open5GS SGWC v2.7.6 Denial of Service |
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| Description | Open5GS SGW-C crashes when processing a GTPv2 Create Session Request containing a malformed Bearer QoS Information Element (IE) within the "Bearer Contexts to be Created" grouped IE.
The issue occurs because the SGW-C handler passes the Bearer QoS IE to the library function ogs_gtp2_parse_bearer_qos without first validating that the IE length matches the expected fixed length for this type. The library function contains a hard assertion that triggers if the length is incorrect, leading to an immediate process abort.
Assert location: lib/gtp/v2/types.c:34 (inside ogs_gtp2_parse_bearer_qos)
Fatal log example: [gtp] FATAL: ogs_gtp2_parse_bearer_qos: Assertion octet->len == GTP2_BEARER_QOS_LEN failed. |
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| Source | ⚠️ https://github.com/open5gs/open5gs/issues/4217 |
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| User | LinZiyu (UID 94035) |
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| Submission | 12/31/2025 08:43 (3 months ago) |
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| Moderation | 01/01/2026 11:57 (1 day later) |
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| Status | Accepted |
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| VulDB entry | 339340 [Open5GS up to 2.7.6 Bearer QoS IE Length lib/gtp/v2/types.c ogs_gtp2_parse_bearer_qos denial of service] |
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| Points | 20 |
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